| Noisy Lifter (I think) [message #287743] |
Tue, 22 September 2015 07:20  |
LNelson
Messages: 335
Registered: December 2008
Location: Springfield, MO
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While parked for a month in it's garage, my 455 decided to honor me with a noisy lifter on a quick trip to Branson Saturday (40 miles). I hear it when the engine is under load...when I back off, like after climbing a grade, the noise goes away. I poured a bit of MMO in the oil at the campground hoping it would heal itself. Still there. I sense no loss of power or engine missing. I guess I need to pop the lid and put my stethoscope on the old girl.
Larry
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT
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| Re: Noisy Lifter (I think) [message #287804 is a reply to message #287748] |
Wed, 23 September 2015 18:52  |
bhayes
Messages: 263
Registered: March 2010
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JohnL455 wrote on Tue, 22 September 2015 07:18Yes, what Larry said.
What Larry and John said. In my case, it was a leaky exhaust gasket. Sounded just like a noisy lifter, but only under load.
Bryan Hayes
'76 Eleganza II
Salt Lake City, Utah
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| Re: [GMCnet] Noisy Lifter (I think) [message #287805 is a reply to message #287804] |
Wed, 23 September 2015 19:36 |
Bruce Hart
Messages: 1501
Registered: October 2011
Location: La Grange, Wyoming
Karma: 5
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One of B. Bramlett's trick is to pour a bit of oil in the carb and wach for
the smoke from the leaking exhaust manifold.
On Wed, Sep 23, 2015 at 5:53 PM, Bryan Hayes wrote:
> JohnL455 wrote on Tue, 22 September 2015 07:18
>> Yes, what Larry said.
>
>
> What Larry and John said. In my case, it was a leaky exhaust gasket.
> Sounded just like a noisy lifter, but only under load.
> --
> Bryan Hayes
> '76 Eleganza II
> Salt Lake City, Utah
>
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--
Bruce Hart
1976 Palm Beach
Milliken, Co
GMC=Got More Class
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Bruce Hart
1976 Palm Beach
1977 28' Kingsley
La Grange, Wyoming
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| Re: Noisy Lifter (I think) [message #287833 is a reply to message #287743] |
Thu, 24 September 2015 21:04 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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Another trick for locating the leak is to run the engine at night with the cover off, The leak will often show as a small flash
Watch where you put your hands. Dont ask me how I know this.
Another possibility as a rocker arm, which is easier to fix.
76 Glenbrook
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| Re: Noisy Lifter (I think) [message #287838 is a reply to message #287833] |
Fri, 25 September 2015 00:22 |
Bullitthead
Messages: 1411
Registered: November 2013
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A length of vacuum hose stuck in your ear and probed around the engine will also locate noises very accurately. Works exceptionally well on exhaust leaks and will kind of shut out the other engine noises so you can hear only where the end of the hose is placed.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Noisy Lifter (I think) [message #287889 is a reply to message #287838] |
Sat, 26 September 2015 09:46 |
LNelson
Messages: 335
Registered: December 2008
Location: Springfield, MO
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Well, I popped the hatch and started her up. I can plainly see, and feel, that the exhaust gasket in front, left side, is the culprit. After a few minutes of running, my CO detector started to fire off and as far as I know, it is still beeping. Waiting to let her cool down and start the PB blaster treatment awaiting the Remflex gaskets I ordered yesterday. I welcome advice as I have never removed the manifolds from any of my 455's. So I assume pulling the left wheel and maybe the left wheel liner is recommended???? Or can I get to that area from below without too much difficulty. Possibly some from the top?? Thanks to all.
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT
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| Re: Noisy Lifter (I think) [message #287891 is a reply to message #287889] |
Sat, 26 September 2015 10:07 |
Bullitthead
Messages: 1411
Registered: November 2013
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You can do the left side from the top pretty easy, no need to do the wheel and liner. Don't even take the donut connection apart if you can get the gasket remnants out. That will help hold the manifold in proper placement. If you can, put a threaded rod back in when you remove the end bolts so you can just slide the manifold away from the head and not need to remove it completely. Try to tweak the bolts tighter just a degree or 2 before loosening them (just to break them free), that trick has saved me from many galled threads and broken bolts. If you do the passenger side, remove the wheel and liner, much easier because of the A/C compressor is in the way of doing that side from the top.
Terry Kelpien
ASE Master Technician
73 Glacier 260
Smithfield, Va.
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| Re: Noisy Lifter (I think) [message #287896 is a reply to message #287743] |
Sat, 26 September 2015 12:25 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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My motor is a 403, and it has headers rather than iron manifolds, but I know there wasn't room to get a regular ratchet on some of the bolts. That ended up not being an issue at all, since they all came out easily enough, so it was really only a couple minutes extra work to spin out the bolts by hand or with a couple dozen extra swings of the wrench. I had open body sockets that would have made it easier, but going to get them would have taken a lot more time than I saved. It really wasn't a difficult job, and was easily done from up top. The only difficulty I had was getting the bolts started again, due to tension from the exhaust system "pulling" on the header, making it tough to push up and forward into position. If I had enlisted the help of another grease monkey, it would have been a piece of cake. As it was, I just lifted the header with a floor jack, and moved it forward with a small pry bar to line up the fist bolts.
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: Noisy Lifter (I think) [message #287899 is a reply to message #287893] |
Sat, 26 September 2015 14:18 |
Chris Tyler
Messages: 458
Registered: September 2013
Location: Odessa FL
Karma: 7
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A Hamilto wrote on Sat, 26 September 2015 10:27Will an impact wrench get the bolts out more reliably without snapping them off? Anybody?
I wouldnt unless you turn down the air pressure. What was mentioned about tightening a bit before trying to remove is good advice. Tapping the wrench with a dead blow hammer helps and gives you more control. Once loose, you can use the air tools
76 Glenbrook
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| Re: Noisy Lifter (I think) [message #287901 is a reply to message #287889] |
Sat, 26 September 2015 14:28 |
C Boyd
Messages: 2629
Registered: April 2006
Karma: 18
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Sir, 4 of the bolts are open end in the spark plug hole. Penetrating oil and a small wire brush to really clean before trying to remove. Six point socket or box end. I have had good luck with impact gun.
LNelson wrote on Sat, 26 September 2015 10:46Well, I popped the hatch and started her up. I can plainly see, and feel, that the exhaust gasket in front, left side, is the culprit. After a few minutes of running, my CO detector started to fire off and as far as I know, it is still beeping. Waiting to let her cool down and start the PB blaster treatment awaiting the Remflex gaskets I ordered yesterday. I welcome advice as I have never removed the manifolds from any of my 455's. So I assume pulling the left wheel and maybe the left wheel liner is recommended???? Or can I get to that area from below without too much difficulty. Possibly some from the top?? Thanks to all.
C. Boyd
76 Crestmont
East Tennessee
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| Re: Noisy Lifter (I think) [message #287920 is a reply to message #287743] |
Sat, 26 September 2015 19:42 |
habbyguy
Messages: 896
Registered: May 2012
Location: Mesa, AZ
Karma: 3
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And just to add the obvious, don't THINK of using an air wrench of any flavor to put the bolts back on... The Remflex gaskets call for torque in the 20 foot/pound range... far under anything you'd reliably get with an air wrench (especially since they should be tightened in a few increments to get there).
Mark Hickey
Mesa, AZ
1978 Royale Center Kitchen
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| Re: [GMCnet] Noisy Lifter (I think) [message #287934 is a reply to message #287889] |
Sat, 26 September 2015 22:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Larry,
To state the obvious: Be VERY careful to not bend the Remflex gaskets AT
ALL. They're very fragile until clamped in place and WILL leak a the
slightest, easy to create, break.
Ken H.
On Sat, Sep 26, 2015 at 10:46 AM, Larry Nelson <
larrynelsonarchitect@mchsi.com> wrote:
> Well, I popped the hatch and started her up. I can plainly see, and feel,
> that the exhaust gasket in front, left side, is the culprit. After a few
> minutes of running, my CO detector started to fire off and as far as I
> know, it is still beeping. Waiting to let her cool down and start the PB
> blaster treatment awaiting the Remflex gaskets I ordered yesterday. I
> welcome advice as I have never removed the manifolds from any of my 455's.
> So I
> assume pulling the left wheel and maybe the left wheel liner is
> recommended???? Or can I get to that area from below without too much
> difficulty.
> Possibly some from the top?? Thanks to all.
> -
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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] Noisy Lifter (I think) [message #287948 is a reply to message #287934] |
Sun, 27 September 2015 14:14 |
tphipps
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
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Do not torque the top center bolt. This bolt just holds the manifold in place until the 4 centerline bolts are installed. If overtightened, it will pull the top of the manifold tighter to the head, than the bottom of the manifold. Voila, a new source of leaks. Torque only the center bolts of the 455. I do not know if this is true on the 403.
Tom, MS II
2012 Phoenix Cruiser model 2552
KA4CSG
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| Re: [GMCnet] Noisy Lifter (I think) [message #287957 is a reply to message #287948] |
Sun, 27 September 2015 21:25 |
LNelson
Messages: 335
Registered: December 2008
Location: Springfield, MO
Karma: 0
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I got all five bolts loose today. Thanks for all the advice. I am waiting for the gaskets to arrive. Thinking about anti seize on the bolts when I put them back in. Thoughts? Thanks again for the great advice.
Larry
Larry Nelson Springfield, MO
Ex GMC'er, then GM Busnut
now '77 Eleganza ARS WB0JOT
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