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[GMCnet] Valve tick? [message #363058]

Thu, 25 March 2021 22:22

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

So Ime hearing quite a bit of what sounds like valve tick on the drivers side.
Just tick, tick, tick, tick...
hopefully it's just an adjustment? ( yeah right )

What should I look for?
it's a 355 that was rebuild about 10 years ago and otherwise runs well.
the last oil analysis (last spring) looked fine

Keith Vasilakes
Mounds View MN
76 exRoyale
MicroLevel

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Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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[GMCnet] Re: Valve tick? [message #363059 is a reply to message #363058]

Thu, 25 March 2021 23:06

jimk

Messages: 6734
Registered: July 2006
Location: Belmont, CA

Karma: 9

Senior Member

Could be a stuck lifter as there were lot of Red Chinese lifters that were
bad,
No wonder they are picked on.

On Thu, Mar 25, 2021 at 8:23 PM Keith V wrote:

> So Ime hearing quite a bit of what sounds like valve tick on the drivers
> side.
> Just tick, tick, tick, tick...
> hopefully it's just an adjustment? ( yeah right )
>
> What should I look for?
> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
> the last oil analysis (last spring) looked fine
>
>
> Keith Vasilakes
> Mounds View MN
> 76 exRoyale
> MicroLevel http://www.gmcmotorhomemarketplace.com/vasilakes/microlevel_intro.pdf>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
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Jim Kanomata
Applied/GMC
jimk@appliedairfilters.com
www.appliedgmc.com
1-800-752-7502

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[GMCnet] Re: Valve tick? [message #363060 is a reply to message #363059]

Thu, 25 March 2021 23:33

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

No one goes chinese for quality.

So how do I determine it's stuck or collapsed or whatever?
________________________________
From: Jim Kanomata
Sent: Thursday, March 25, 2021 11:06 PM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Valve tick?

Could be a stuck lifter as there were lot of Red Chinese lifters that were
bad,
No wonder they are picked on.

On Thu, Mar 25, 2021 at 8:23 PM Keith V wrote:

> So Ime hearing quite a bit of what sounds like valve tick on the drivers
> side.
> Just tick, tick, tick, tick...
> hopefully it's just an adjustment? ( yeah right )
>
> What should I look for?
> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
> the last oil analysis (last spring) looked fine
>
>
> Keith Vasilakes
> Mounds View MN
> 76 exRoyale
> MicroLevel http://www.gmcmotorhomemarketplace.com/vasilakes/microlevel_intro.pdf>
>
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>

--
Jim Kanomata
Applied/GMC, Newark,CA
jimk@appliedairfilters.com
http://www.gmcrvparts.com
1-800-752-7502
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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Re: [GMCnet] Valve tick? [message #363063 is a reply to message #363058]

Fri, 26 March 2021 09:40

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Keith V wrote on Thu, 25 March 2021 23:22

So Ime hearing quite a bit of what sounds like valve tick on the drivers side.
Just tick, tick, tick, tick...
hopefully it's just an adjustment? ( yeah right )

What should I look for?
it's a 355 that was rebuild about 10 years ago and otherwise runs well.
the last oil analysis (last spring) looked fine

Keith Vasilakes
Mounds View MN
76 exRoyale
MicroLevel

Keith,

First, are you sure this is in the valve speed range. You know enough about engines that I think we can be sure you are good there.

In a stock 455, there is no adjustment possible. Replacing a lash adjuster (lifter) is means removing the intake.

Let's start looking at the positive side. If this developed recently, it could just be a single piece of micro-crud fouling one of the two valves in a single hydraulic lash adjuster. If the coach has not had a highway pull recently, it could be carbon on an exhaust valve. Let hope for one of these.

This is actually a very common issue. Now I would ask what lube oil you are using. If like many of us, you are running a 15WXX, you might try going to a 5WXX for a short test. I have seen cases where the less viscous lube oil get when the thicker did not. Given the conditions in Minnesota, it may take a while to determine if this got it of not. The 5WXX oil will not have the anti-wear additives to protect the camshaft lobes, so idle it a minimum with that oil fill.

People always want to determine which lash adjuster is the issue, but it seldom matters. You can guess a side pretty easily, but to determine which is the actual problem, you have to idle the engine with the valve gear cover removed. As the system lubricates the valve gear by pushing lube oil up the push rods, this is really messy unless you get the little clips that go on the rockers.

Let us know what you are doing and maybe we can provide more information.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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[GMCnet] Re: Valve tick? [message #363065 is a reply to message #363063]

Fri, 26 March 2021 09:59

powwerjon

Messages: 849
Registered: March 2013

Karma: -2

Senior Member

How about an exhaust gasket leak? I had a ticking sound and it turned out to be a leaking exhaust gasket leak and they don’t go away, only get worse.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

> On Mar 26, 2021, at 10:40 AM, Matt Colie wrote:
>
> Keith V wrote on Thu, 25 March 2021 23:22
>> So Ime hearing quite a bit of what sounds like valve tick on the drivers side.
>> Just tick, tick, tick, tick...
>> hopefully it's just an adjustment? ( yeah right )
>>
>> What should I look for?
>> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
>> the last oil analysis (last spring) looked fine
>>
>>
>> Keith Vasilakes
>> Mounds View MN
>> 76 exRoyale
>> MicroLevel
>
> Keith,
>
> First, are you sure this is in the valve speed range. You know enough about engines that I think we can be sure you are good there.
>
> In a stock 455, there is no adjustment possible. Replacing a lash adjuster (lifter) is means removing the intake.
>
> Let's start looking at the positive side. If this developed recently, it could just be a single piece of micro-crud fouling one of the two valves in a
> single hydraulic lash adjuster. If the coach has not had a highway pull recently, it could be carbon on an exhaust valve. Let hope for one of these.
>
>
> This is actually a very common issue. Now I would ask what lube oil you are using. If like many of us, you are running a 15WXX, you might try going
> to a 5WXX for a short test. I have seen cases where the less viscous lube oil get when the thicker did not. Given the conditions in Minnesota, it
> may take a while to determine if this got it of not. The 5WXX oil will not have the anti-wear additives to protect the camshaft lobes, so idle it a
> minimum with that oil fill.
>
> People always want to determine which lash adjuster is the issue, but it seldom matters. You can guess a side pretty easily, but to determine which
> is the actual problem, you have to idle the engine with the valve gear cover removed. As the system lubricates the valve gear by pushing lube oil up
> the push rods, this is really messy unless you get the little clips that go on the rockers.
>
> Let us know what you are doing and maybe we can provide more information.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
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[GMCnet] Re: Valve tick? [message #363066 is a reply to message #363065]

Fri, 26 March 2021 10:45

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

Thanks!
Firstly it does have an adjustable valve train that was put in on the rebuild.
Ill pull the cover off this weekend and see what it looks like, maybe make a mess.

I did sniff around for an exhaust leak, nothing obvious, but of course still possible (hopefull !)
I run 10w30, let the engine warm up and it didnt change.

The coach has sat all winter, and a lot of last summer, so who knows whats gone bad
________________________________
From: John Wright
Sent: Friday, March 26, 2021 9:59:05 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Valve tick?

How about an exhaust gasket leak? I had a ticking sound and it turned out to be a leaking exhaust gasket leak and they don’t go away, only get worse.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

> On Mar 26, 2021, at 10:40 AM, Matt Colie wrote:
>
> Keith V wrote on Thu, 25 March 2021 23:22
>> So Ime hearing quite a bit of what sounds like valve tick on the drivers side.
>> Just tick, tick, tick, tick...
>> hopefully it's just an adjustment? ( yeah right )
>>
>> What should I look for?
>> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
>> the last oil analysis (last spring) looked fine
>>
>>
>> Keith Vasilakes
>> Mounds View MN
>> 76 exRoyale
>> MicroLevel
>
> Keith,
>
> First, are you sure this is in the valve speed range. You know enough about engines that I think we can be sure you are good there.
>
> In a stock 455, there is no adjustment possible. Replacing a lash adjuster (lifter) is means removing the intake.
>
> Let's start looking at the positive side. If this developed recently, it could just be a single piece of micro-crud fouling one of the two valves in a
> single hydraulic lash adjuster. If the coach has not had a highway pull recently, it could be carbon on an exhaust valve. Let hope for one of these.
>
>
> This is actually a very common issue. Now I would ask what lube oil you are using. If like many of us, you are running a 15WXX, you might try going
> to a 5WXX for a short test. I have seen cases where the less viscous lube oil get when the thicker did not. Given the conditions in Minnesota, it
> may take a while to determine if this got it of not. The 5WXX oil will not have the anti-wear additives to protect the camshaft lobes, so idle it a
> minimum with that oil fill.
>
> People always want to determine which lash adjuster is the issue, but it seldom matters. You can guess a side pretty easily, but to determine which
> is the actual problem, you have to idle the engine with the valve gear cover removed. As the system lubricates the valve gear by pushing lube oil up
> the push rods, this is really messy unless you get the little clips that go on the rockers.
>
> Let us know what you are doing and maybe we can provide more information.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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[GMCnet] Re: Valve tick? [message #363067 is a reply to message #363066]

Fri, 26 March 2021 11:11

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

Some of the components in aftermarket pushrod/rocker arm/cam and lifter
combinations do not always play well together. Been using this kind of
stuff since I was a teen ager, and I am 80 years old now. Seen a lot more
junk stuff out there than I have high quality, compatible components. And
price is not a good yardstick, either. But, there is good stuff out there,
it takes some looking to find it.
That is the manner of stuff that comes under the heading of "secrets
of speed" and closely guarded. Normally these days, I share some of this.
But, my recommendation on 455's is to stick with the proven stock stuff. I
do stray off course when it comes to Cams and Lifters, though. Look into
Elgin. SoCal company, one horse outfit. Custom made stuff for the
rebuilding industry. They have a web presence. Know what you want going
in. Don't waste their time otherwise.
Jim Hupy
Salem, Oregon

On Fri, Mar 26, 2021, 8:45 AM Keith V wrote:

> Thanks!
> Firstly it does have an adjustable valve train that was put in on the
> rebuild.
> Ill pull the cover off this weekend and see what it looks like, maybe make
> a mess.
>
> I did sniff around for an exhaust leak, nothing obvious, but of course
> still possible (hopefull !)
> I run 10w30, let the engine warm up and it didnt change.
>
> The coach has sat all winter, and a lot of last summer, so who knows whats
> gone bad
> ________________________________
> From: John Wright
> Sent: Friday, March 26, 2021 9:59:05 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Re: Valve tick?
>
> How about an exhaust gasket leak? I had a ticking sound and it turned out
> to be a leaking exhaust gasket leak and they don’t go away, only get worse.
>
> J.R. Wright
> GMC Great Laker MHC
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI
> 78 GMC Buskirk 29.5’ Stretch
> 75 GMC Avion (Under Reconstruction)
> Michigan
>
>> On Mar 26, 2021, at 10:40 AM, Matt Colie wrote:
>>
>> Keith V wrote on Thu, 25 March 2021 23:22
>>> So Ime hearing quite a bit of what sounds like valve tick on the
> drivers side.
>>> Just tick, tick, tick, tick...
>>> hopefully it's just an adjustment? ( yeah right )
>>>
>>> What should I look for?
>>> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
>>> the last oil analysis (last spring) looked fine
>>>
>>>
>>> Keith Vasilakes
>>> Mounds View MN
>>> 76 exRoyale
>>> MicroLevel
>>
>> Keith,
>>
>> First, are you sure this is in the valve speed range. You know enough
> about engines that I think we can be sure you are good there.
>>
>> In a stock 455, there is no adjustment possible. Replacing a lash
> adjuster (lifter) is means removing the intake.
>>
>> Let's start looking at the positive side. If this developed recently, it
> could just be a single piece of micro-crud fouling one of the two valves in
> a
>> single hydraulic lash adjuster. If the coach has not had a highway pull
> recently, it could be carbon on an exhaust valve. Let hope for one of
> these.
>>
>>
>> This is actually a very common issue. Now I would ask what lube oil you
> are using. If like many of us, you are running a 15WXX, you might try going
>> to a 5WXX for a short test. I have seen cases where the less viscous
> lube oil get when the thicker did not. Given the conditions in Minnesota,
> it
>> may take a while to determine if this got it of not. The 5WXX oil will
> not have the anti-wear additives to protect the camshaft lobes, so idle it a
>> minimum with that oil fill.
>>
>> People always want to determine which lash adjuster is the issue, but it
> seldom matters. You can guess a side pretty easily, but to determine which
>> is the actual problem, you have to idle the engine with the valve gear
> cover removed. As the system lubricates the valve gear by pushing lube oil
> up
>> the push rods, this is really messy unless you get the little clips that
> go on the rockers.
>>
>> Let us know what you are doing and maybe we can provide more information.
>>
>> Matt
>> --
>> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
>> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
>> SE Michigan - Near DTW - Twixt A2 and Detroit
>> _______________________________________________
>> GMCnet mailing list
>> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
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Unsubscribe or Change List Options:

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[GMCnet] Re: Valve tick? [message #363094 is a reply to message #363066]

Sat, 27 March 2021 16:03

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

Karma: 0

Senior Member

Ok warmed the engine up, then pulled the valve cover.

Yes it has adjustable lifters

The #1 intake, closest to the front xould be pushed down easily, just a little spring pressure

The #7 exhaust, closest to the back has a lot of carbon while the rest are clean, should I worry?

I started the engine with the valve cover off and oil squirted out of #1 so hard it hit the drivers seat! No video cause I shut it down ASAP!

So what do you guys think?

Obviously the lifter is bad? or is it something else?.

here's a picture of the carboned rocker

[img]http://www.gmcmhphotos.com/photos/data/7358/20210327_133702.jpg[/img]

________________________________
From: Keith V
Sent: Friday, March 26, 2021 10:45:22 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Valve tick?

Thanks!
Firstly it does have an adjustable valve train that was put in on the rebuild.
Ill pull the cover off this weekend and see what it looks like, maybe make a mess.

I did sniff around for an exhaust leak, nothing obvious, but of course still possible (hopefull !)
I run 10w30, let the engine warm up and it didnt change.

The coach has sat all winter, and a lot of last summer, so who knows whats gone bad
________________________________
From: John Wright
Sent: Friday, March 26, 2021 9:59:05 AM
To: gmclist@list.gmcnet.org
Subject: [GMCnet] Re: Valve tick?

How about an exhaust gasket leak? I had a ticking sound and it turned out to be a leaking exhaust gasket leak and they don’t go away, only get worse.

J.R. Wright
GMC Great Laker MHC
GMCGL Tech Editor
GMC Eastern States Charter Member
GMCMI
78 GMC Buskirk 29.5’ Stretch
75 GMC Avion (Under Reconstruction)
Michigan

> On Mar 26, 2021, at 10:40 AM, Matt Colie wrote:
>
> Keith V wrote on Thu, 25 March 2021 23:22
>> So Ime hearing quite a bit of what sounds like valve tick on the drivers side.
>> Just tick, tick, tick, tick...
>> hopefully it's just an adjustment? ( yeah right )
>>
>> What should I look for?
>> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
>> the last oil analysis (last spring) looked fine
>>
>>
>> Keith Vasilakes
>> Mounds View MN
>> 76 exRoyale
>> MicroLevel
>
> Keith,
>
> First, are you sure this is in the valve speed range. You know enough about engines that I think we can be sure you are good there.
>
> In a stock 455, there is no adjustment possible. Replacing a lash adjuster (lifter) is means removing the intake.
>
> Let's start looking at the positive side. If this developed recently, it could just be a single piece of micro-crud fouling one of the two valves in a
> single hydraulic lash adjuster. If the coach has not had a highway pull recently, it could be carbon on an exhaust valve. Let hope for one of these.
>
>
> This is actually a very common issue. Now I would ask what lube oil you are using. If like many of us, you are running a 15WXX, you might try going
> to a 5WXX for a short test. I have seen cases where the less viscous lube oil get when the thicker did not. Given the conditions in Minnesota, it
> may take a while to determine if this got it of not. The 5WXX oil will not have the anti-wear additives to protect the camshaft lobes, so idle it a
> minimum with that oil fill.
>
> People always want to determine which lash adjuster is the issue, but it seldom matters. You can guess a side pretty easily, but to determine which
> is the actual problem, you have to idle the engine with the valve gear cover removed. As the system lubricates the valve gear by pushing lube oil up
> the push rods, this is really messy unless you get the little clips that go on the rockers.
>
> Let us know what you are doing and maybe we can provide more information.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

Report message to a moderator

[GMCnet] Re: Valve tick? [message #363095 is a reply to message #363094]

Sat, 27 March 2021 16:50

Ken Henderson

Messages: 8726
Registered: March 2004
Location: Americus, GA

Karma: 9

Senior Member

Have you checked the compression on #7 cylinder? Almost certainly that
exhaust valve is leaking badly. :-(

Ken H.

On Sat, Mar 27, 2021 at 5:03 PM Keith V wrote:

> Ok warmed the engine up, then pulled the valve cover.
>
>
> Yes it has adjustable lifters
>
> The #1 intake, closest to the front xould be pushed down easily, just a
> little spring pressure
>
> The #7 exhaust, closest to the back has a lot of carbon while the rest are
> clean, should I worry?
>
> I started the engine with the valve cover off and oil squirted out of #1
> so hard it hit the drivers seat! No video cause I shut it down ASAP!
>
> So what do you guys think?
>
> Obviously the lifter is bad? or is it something else?.
>
> here's a picture of the carboned rocker
>
> [url=
> http://www.gmcmhphotos.com/photos/data/7358/20210327_133702.jpg][img]http://www.gmcmhphotos.com/photos/data/7358/20210327_133702.jpg[/img][/url
> ]
>
> ________________________________
> From: Keith V
> Sent: Friday, March 26, 2021 10:45:22 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Re: Valve tick?
>
> Thanks!
> Firstly it does have an adjustable valve train that was put in on the
> rebuild.
> Ill pull the cover off this weekend and see what it looks like, maybe make
> a mess.
>
> I did sniff around for an exhaust leak, nothing obvious, but of course
> still possible (hopefull !)
> I run 10w30, let the engine warm up and it didnt change.
>
> The coach has sat all winter, and a lot of last summer, so who knows whats
> gone bad
> ________________________________
> From: John Wright
> Sent: Friday, March 26, 2021 9:59:05 AM
> To: gmclist@list.gmcnet.org
> Subject: [GMCnet] Re: Valve tick?
>
> How about an exhaust gasket leak? I had a ticking sound and it turned out
> to be a leaking exhaust gasket leak and they don’t go away, only get worse.
>
> J.R. Wright
> GMC Great Laker MHC
> GMCGL Tech Editor
> GMC Eastern States Charter Member
> GMCMI
> 78 GMC Buskirk 29.5’ Stretch
> 75 GMC Avion (Under Reconstruction)
> Michigan
>
>> On Mar 26, 2021, at 10:40 AM, Matt Colie wrote:
>>
>> Keith V wrote on Thu, 25 March 2021 23:22
>>> So Ime hearing quite a bit of what sounds like valve tick on the
> drivers side.
>>> Just tick, tick, tick, tick...
>>> hopefully it's just an adjustment? ( yeah right )
>>>
>>> What should I look for?
>>> it's a 355 that was rebuild about 10 years ago and otherwise runs well.
>>> the last oil analysis (last spring) looked fine
>>>
>>>
>>> Keith Vasilakes
>>> Mounds View MN
>>> 76 exRoyale
>>> MicroLevel
>>
>> Keith,
>>
>> First, are you sure this is in the valve speed range. You know enough
> about engines that I think we can be sure you are good there.
>>
>> In a stock 455, there is no adjustment possible. Replacing a lash
> adjuster (lifter) is means removing the intake.
>>
>> Let's start looking at the positive side. If this developed recently, it
> could just be a single piece of micro-crud fouling one of the two valves in
> a
>> single hydraulic lash adjuster. If the coach has not had a highway pull
> recently, it could be carbon on an exhaust valve. Let hope for one of
> these.
>>
>>
>> This is actually a very common issue. Now I would ask what lube oil you
> are using. If like many of us, you are running a 15WXX, you might try going
>> to a 5WXX for a short test. I have seen cases where the less viscous
> lube oil get when the thicker did not. Given the conditions in Minnesota,
> it
>> may take a while to determine if this got it of not. The 5WXX oil will
> not have the anti-wear additives to protect the camshaft lobes, so idle it a
>> minimum with that oil fill.
>>
>> People always want to determine which lash adjuster is the issue, but it
> seldom matters. You can guess a side pretty easily, but to determine which
>> is the actual problem, you have to idle the engine with the valve gear
> cover removed. As the system lubricates the valve gear by pushing lube oil
> up
>> the push rods, this is really messy unless you get the little clips that
> go on the rockers.
>>
>> Let us know what you are doing and maybe we can provide more information.
>>
>> Matt
>> --
>> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
>> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
>> SE Michigan - Near DTW - Twixt A2 and Detroit
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach

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Re: [GMCnet] Re: Valve tick? [message #363115 is a reply to message #363094]

Sun, 28 March 2021 12:18

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Keith,

First off, that oil at the rocker arm should not be able to have the force to get to the driver's seat! That and the fact that you said you could depress that lash adjuster with little difficulty tells me that this is probably some of your problem. There is supposed to be a small functioning flow limiter in the socket end of the lash adjusted to control the flow up the push tube to the rocker arm.

That lash adjuster is expected to deliver some oil to the rocker arm. It should be enough to make a real mess, but this is also why I recommended that you look up a set of "Rocker Arm Oil Deflector Clips". Every wrench that does much GM work has a set. (I made the mistake of lending mine and they are gone for good.) They are available from Amazon, but not Rock Auto?

Next Item, That coked up rocker arm would worry me greatly (but it is not my engine). That coke is what happens when lube oil gets over about 350°F. The rocker arm is supposed to be both lubricated AND COOLED by the lube oil being pumped up by the lash adjuster. It has been much hotter than it should ever be.

Got a connection here?

I believe you have a serious issue with the lash adjusters (lifters), they have either both been affected by something in the lube oil or were not very good when installed. If removed, they can both be opened up and inspected. If you care to know more about this, I will be glad to pass it along. Do not start without more instructions.

That number seven exhaust rocker may have been damaged by the lack of adequate lube oil coolant. It should be carefully inspected.

Well, at least you have some time before the travel season starts. If you want to talk, get the house line out of the Black list. Sorry I was so long getting on this, I have been out under one of the cars replacing rusted out brake and fuel lines. OK, it's on a lift, it still is just no fun.

Matt

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[GMCnet] Re: Valve tick? [message #363122 is a reply to message #363115]

Sun, 28 March 2021 12:38

James Hupy

Messages: 6806
Registered: May 2010

Karma: -62

Senior Member

It points squarely (at least to me) at bogus valve lifters. More bad ones
out there than there are good ones. I've learned that difficult lesson the
hard way. And, because of the fact that the lifters are going to need
replaced, guess what they are broken in to? Right, the camshaft. That
means that it needs to go, along with the lifters. Bad news nearly travels
with two companions. I would look long and hard at the needle bearing
rocker arms as well.
Or, you can just replace one lifter, and button it back up and pray
hard every Sunday. (And worry about it going sideways every time you drive
it). Your money, not mine. Spend it how you see fit.
Jim Hupy
Salem, Oregon

On Sun, Mar 28, 2021, 10:18 AM Matt Colie wrote:

> Keith,
>
> First off, that oil at the rocker arm should not be able to have the force
> to get to the driver's seat! That and the fact that you said you could
> depress that lash adjuster with little difficulty tells me that this is
> probably some of your problem. There is supposed to be a small functioning
> flow limiter in the socket end of the lash adjusted to control the flow up
> the push tube to the rocker arm.
>
> That lash adjuster is expected to deliver some oil to the rocker arm. It
> should be enough to make a real mess, but this is also why I recommended
> that you look up a set of "Rocker Arm Oil Deflector Clips". Every wrench
> that does much GM work has a set. (I made the mistake of lending mine and
> they are gone for good.) They are available from Amazon, but not Rock
> Auto?
>
> Next Item, That coked up rocker arm would worry me greatly (but it is not
> my engine). That coke is what happens when lube oil gets over about 350°F.
> The rocker arm is supposed to be both lubricated AND COOLED by the lube
> oil being pumped up by the lash adjuster. It has been much hotter than it
> should ever be.
>
> Got a connection here?
>
> I believe you have a serious issue with the lash adjusters (lifters), they
> have either both been affected by something in the lube oil or were not
> very good when installed. If removed, they can both be opened up and
> inspected. If you care to know more about this, I will be glad to pass it
> along. Do not start without more instructions.
>
> That number seven exhaust rocker may have been damaged by the lack of
> adequate lube oil coolant. It should be carefully inspected.
>
> Well, at least you have some time before the travel season starts. If you
> want to talk, get the house line out of the Black list. Sorry I was so
> long getting on this, I have been out under one of the cars replacing
> rusted out brake and fuel lines. OK, it's on a lift, it still is just no
> fun.
>
> Matt
> --
> Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL,
> GMCES
> Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum
> Brakes with Applied Control Arms
> SE Michigan - Near DTW - Twixt A2 and Detroit
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
>
_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:

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