GMCforum: GMCnet » oil pressure relief valve?

Home » Public Forums » GMCnet » oil pressure relief valve?

Show: Today's Messages :: Polls :: Message Navigator

oil pressure relief valve? [message #273772]

Mon, 16 March 2015 06:25

skip2

Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...

Karma: 3

Senior Member

I believe there is a valve behind the oil cooler adapter actually in the block that is the oil pressure relief valve, does anyone know what are the symptons are if it has trash in it or for some reason it doesn't seal good or the spring is weak. Still fighting oil pressure issues once the motor is warmed up and you travel at highway speeds for a while then as soon as you slow down for stop and go traffic or rest stop, oil pressure comes back up to safe levels (35-40) and stays there till you get back on highway for a while. I read awhile back that the Olds pressure is after it goes through the motor and not just as it goes in so it seems that any pressure after it makes it's way through is good. Motor runs great otherwise and I am running a mechanical gauge and napa filter with 10w/40 oil. I have actually soaked the pan with cleaner and used a vacuum pump several times and tried to pump any trash out and could not pick up any sludge off of bottom of pan. Any and all thought and ideals would be appreciated.
Skip Hartline

74 Canyon Lands, FiTech, 3.7 FD LSD, Manny Tranny, Springfield Distributor, 2001 Chevy Tracker Ragtop Towd

Report message to a moderator

Re: [GMCnet] oil pressure relief valve? [message #273778 is a reply to message #273772]

Mon, 16 March 2015 08:24

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Skip,

Here's a series of photographs that show the oil flow path in an Olds 455 / 403:

http://www.gmcmhphotos.com/photos/g6398-455-2f-403-engine-oil-flow-path.html

If the poppet was not seating correctly for whatever the reason you would have lower oil pressure.

There is a bypass valve in the oil filter adapter that opens if the differential pressure is 5.3 - 6.3 psi.

http://www.gmcmhphotos.com/photos/455-2f-403-engine-oil-flow-path/p49551-oil-cooler-2f-filter-adapter-inside.html

Regards,
Rob M.

-----Original Message-----
From: Skip Hartline

I believe there is a valve behind the oil cooler adapter actually in the block that is the oil pressure relief valve, does anyone
know what are the symptons are if it has trash in it or for some reason it doesn't seal good or the spring is weak. Still fighting
oil pressure issues once the motor is warmed up and you travel at highway speeds for a while then as soon as you slow down for stop
and go traffic or rest stop, oil pressure comes back up to safe levels (35-40) and stays there till you get back on highway for a
while. I read awhile back that the Olds pressure is after it goes through the motor and not just as it goes in so it seems that any
pressure after it makes it's way through is good. Motor runs great otherwise and I am running a mechanical gauge and napa filter
with 10w/40 oil. I have actually soaked the pan with cleaner and used a vacuum pump several times and tried to pump any trash out
and could not pick up any sludge off of bottom of pan. Any and all thought and ideals would be appreciated.
Skip Hartline

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

Report message to a moderator

Re: oil pressure relief valve? [message #273797 is a reply to message #273772]

Mon, 16 March 2015 10:48

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

If your using the dash gauge to tell you anything "fuggetaboutit" the sender is notorious for corroding because it is out front. Replace the sender first. See this set of pictures.
http://www.gmcmhphotos.com/photos/engine-failure/p51645-mechanics-of-the-oil-pressure-sending-unit.html
The oil pressure regulator is in and part of the oil pump.
Best Regards

John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta

Report message to a moderator

Re: oil pressure relief valve? [message #273798 is a reply to message #273772]

Mon, 16 March 2015 11:04

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

By the way:

The oil pressure sending unit (port) actually is about half way through the oil path.
Oil goes to front of engine in one galley on one side of the engine: down to first main bearing: then up to the Oil pressure port: then to the back of the engine through the other gallery on the other side of the engine. Finally some squirts out at the distributor gear throught a hole in the gallery plug. (If your engine has a hole. Because it appears some do not)

John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta

Report message to a moderator

Re: oil pressure relief valve? [message #273802 is a reply to message #273772]

Mon, 16 March 2015 11:10

roy1

Messages: 2126
Registered: July 2004
Location: Minden nevada

Karma: 6

Senior Member

Like rob pointed out that isn't the oil pressure regulator it is just the filter bypass. You would need to get the pan off to access the oil pressure regulator located in the oil pump. This is a time consuming job good luck.

Roy Keen Minden,NV 76 X Glenbrook

Report message to a moderator

Re: oil pressure relief valve? [message #273816 is a reply to message #273772]

Mon, 16 March 2015 11:55

Matt Colie

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

Karma: 7

Senior Member

skip2 wrote on Mon, 16 March 2015 07:25

I believe there is a valve behind the oil cooler adapter actually in the block that is the oil pressure relief valve, does anyone know what are the symptons are if it has trash in it or for some reason it doesn't seal good or the spring is weak. Still fighting oil pressure issues once the motor is warmed up and you travel at highway speeds for a while then as soon as you slow down for stop and go traffic or rest stop, oil pressure comes back up to safe levels (35-40) and stays there till you get back on highway for a while. I read awhile back that the Olds pressure is after it goes through the motor and not just as it goes in so it seems that any pressure after it makes it's way through is good. Motor runs great otherwise and I am running a mechanical gauge and napa filter with 10w/40 oil. I have actually soaked the pan with cleaner and used a vacuum pump several times and tried to pump any trash out and could not pick up any sludge off of bottom of pan. Any and all thought and ideals would be appreciated.
Skip Hartline

Skip,

Are you saying that the indicted lube oil pressure DROPS while you are running?
Then it comes back up when you slow down for any reason?

If that is the case, check your lube oil level.
Either too high or too low can do this.
Too High and the oil is getting whipped into foam.
Too Low and you are sucking air at the pick up.
A cracked pick up can behave like too low also.

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

Report message to a moderator

Re: oil pressure relief valve? [message #273818 is a reply to message #273772]

Mon, 16 March 2015 12:12

John Heslinga

Messages: 632
Registered: February 2011
Location: Edmonton, Alberta, Canada

Karma: 4

Senior Member

On rereading, I see you did state that you were using a Mechanical gauge. Some how that did not sink in when i was reading that the first time. SORRY.

I would like to add to Matt's statements. The oil pick up tube is press fit into the pump. It could also be comming loose and sucking air at that connection. Unfortunately most ideas mean getting into the bottom of that engine. A very big job indeed.

John and Cathie Heslinga 1974 Canyonlands 260 455, Manny tranny and 1 ton, 3:70 LS, Red Seal Journeyman, DTE, BEd. MEd. Edmonton, Alberta

[Updated on: Mon, 16 March 2015 12:16]

Report message to a moderator

Re: oil pressure relief valve? [message #273862 is a reply to message #273772]

Tue, 17 March 2015 06:12

skip2

Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...

Karma: 3

Senior Member

Thanks for all the replies and Ideals, just wish there was a way to come up with an electric oil pump and put it in-line to help with any possible air sucking at the pickup or oil pump, then you'd be right back with pulling the oil pan,or maybe, some how tieing it into the cooler hoses.
I know, sometimes the mind can be a terrible thing.
Skip Hartline

74 Canyon Lands, FiTech, 3.7 FD LSD, Manny Tranny, Springfield Distributor, 2001 Chevy Tracker Ragtop Towd

[Updated on: Tue, 17 March 2015 06:12]

Report message to a moderator

Re: [GMCnet] oil pressure relief valve? [message #273868 is a reply to message #273862]

Tue, 17 March 2015 09:03

USAussie

Messages: 15912
Registered: July 2007
Location: Sydney, Australia

Karma: 6

Senior Member

Skip,

You could try removing the oil filter adapter and oil cooler adapter to:

1) check the bypass valve in the oil filter adapter
2) replace the seal between the oil filter adapter and oil cooler adapter with an O-ring as shown in the photos I linked earlier
3) install a WIX 51049 oil filter

Regards,
Rob M.

-----Original Message-----
From: Gmclist [mailto:gmclist-bounces@temp.gmcnet.org] On Behalf Of Skip Hartline
Sent: Tuesday, March 17, 2015 6:12 AM
To: gmclist@temp.gmcnet.org
Subject: Re: [GMCnet] oil pressure relief valve?

Thanks for all the replies and Ideals, just wish there was a way to come up with an electric oil pump and put it in-line to help
with any possible air sucking at the pickup or oil pump, then you'd be right with pulling the oil pan,or maybe some how tieing it
into the cooler hoses.
I know, sometimes the mind can be a terrible thing.
Skip Hartline

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Regards, Rob M. (USAussie) The Pedantic Mechanic Sydney, Australia '75 Avion - AUS - The Blue Streak TZE365V100428 '75 Avion - USA - Double Trouble TZE365V100426

Report message to a moderator

Re: oil pressure relief valve? [message #273873 is a reply to message #273862]

Tue, 17 March 2015 10:51

Dennis S

Messages: 3046
Registered: November 2005

Karma: 2

Senior Member

skip2 wrote on Tue, 17 March 2015 06:12

Thanks for all the replies and Ideals, just wish there was a way to come up with an electric oil pump and put it in-line to help with any possible air sucking at the pickup or oil pump, then you'd be right back with pulling the oil pan,or maybe, some how tieing it into the cooler hoses.
I know, sometimes the mind can be a terrible thing.
Skip Hartline

Skip
Perhaps you should try a different oil pressure gauge and feed line. i believe that is what I would do at this point.

Dennis

Dennis S
73 Painted Desert 230
Memphis TN Metro

Report message to a moderator

Re: oil pressure relief valve? [message #273881 is a reply to message #273772]

Tue, 17 March 2015 11:45

bwevers

Messages: 597
Registered: October 2010
Location: San Jose

Karma: 5

Senior Member

Is your oil cooler doing it's job?

Bill Wevers GMC49ers, GMC Western States 1975 Glenbrook - Manny Powerdrive, OneTon 455 F Block, G heads San Jose

Report message to a moderator

Re: [GMCnet] oil pressure relief valve? [message #274243 is a reply to message #273868]

Tue, 24 March 2015 06:13

skip2

Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...

Karma: 3

Senior Member

Notice you mentioned trying a 51049 Wix instead of the 51258 Wix I see recommended all the time. I checked and the differences are about 1" taller and no anti-drainback valve. Just trying to understand how this could help, enquiring minds want to know. As soon as I can I'm going to try it. Also about the photo you showed with the flat spot on the poppet valve. Is that piece suppose to be missing of the edge?
Skip Hartline

74 Canyon Lands, FiTech, 3.7 FD LSD, Manny Tranny, Springfield Distributor, 2001 Chevy Tracker Ragtop Towd

Report message to a moderator

Re: [GMCnet] oil pressure relief valve? [message #274249 is a reply to message #274243]

Tue, 24 March 2015 07:04

tphipps

Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL

Karma: 9

Senior Member

The WIX 51049 offers more filter area due to it's extra inch of length. Does not rest or hit against anything when installed on the 455. It mates with the oil filter adapter easily, with no leaks. I have used it on several 455's with no problems.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

Report message to a moderator

Re: [GMCnet] oil pressure relief valve? [message #274270 is a reply to message #274243]

Tue, 24 March 2015 10:49

powwerjon

Messages: 849
Registered: March 2013

Karma: -2

Senior Member

Skip,
The Wix 51049 filter is only I have used since 2000 on the 3 coaches that I have owned or still own. Never had any issues and the extra capacity of both filter material and oil does hurt. No interference issues and I also run one of Dick Patersons filter magnets. With the non synthetic that I ran till 2006 I changes oil at the 3000 mile mark or once a year before I retired. I have run Mobile 1 in the stretch because that is what the PO was running and we got the coach in 2011. Typically change oil about every 5000 miles or about twice a year. Good Filter!

J.R. Wright
30' Buskirk Stretch
Michigan
On Location in Tucson

> On Mar 24, 2015, at 4:13 AM, Skip Hartline wrote:
>
> Notice you mentioned trying a 51049 Wix instead of the 51258 Wix I see recommended all the time. I checked and the differences are about 1" taller and
> no anti-drainback valve. Just trying to understand how this could help, enquiring minds want to know. As soon as I can I'm going to try it. Also about
> the photo you showed with the flat spot on the poppet valve. Is that piece suppose to be missing of the edge?
> Skip Hartline

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Report message to a moderator

Previous Topic:	Q. for Larry
Next Topic:	[GMCnet] Fwd: Fwd: YouTube video of Chevy Corvette engine assembly at plant.

Goto Forum:

-=] Back to Top [=-

Current Time: Tue Sep 24 18:18:19 CDT 2024

Total time taken to generate the page: 0.01715 seconds