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Valve Cover leaking
#1325320 Sun Sep 08 2019 02:02 PM
Joined: Jun 2014
Posts: 108
CJDublu Offline OP
Shop Shark
Any suggestions on keeping oil in the valve cover?

I’ve done two gaskets and it is still pouring out of the left front. What is everyone’s thought on removing the “blanket” that is inside the cover. I’m wondering if that isn’t directing the oil to one side.


1937 Chevy 1/2-ton
"Wylburr Clyde"
In the Stovebolt Gallery
More pictures on Google

My Grandfather bought it new and Dad drove it through highschool. The 3rd & 4th generations put it back on the road on 8/8/2015!
Re: Valve Cover leaking
CJDublu #1325334 Sun Sep 08 2019 05:43 PM
Joined: Sep 2001
Posts: 30,131
ace skiver
That "blanket" was standard equipment.

Maybe one of our old-time truck-engine owners will comment on the purpose.

My guess is that it has something to do will lubricating the rocker-arm assembly and the valve stems?

Tim []
1954 3106 Carryall Suburban [] - part of the family for 49 years
1954 3104 5-window pickup w/Hydra-Matic [] - part of the family for 15 years
- If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.
- The 216 and early 235 engines are not "splash oilers" - this is a splash oiler. []
Re: Valve Cover leaking
CJDublu #1325341 Sun Sep 08 2019 07:15 PM
Joined: Feb 2004
Posts: 20,562
If it's a thick piece of felt, it's a holdover from the 4 cylinder days in the late 1920's when the rocker arms got lubed by squirting oi through some small holes in the valve cover with a hand-pump oil can to saturate the pad. Later 216's and newer engines didn't have that pad, so it probably won't hurt to remove it. A better idea would be to find where the valve cover is warped and straighten it. Remove the cover and invert it on a workbench and use something like a long carpenter's level and a feeler gauge to check for bowed spots that are failing to put pressure on the gasket. Repeatedly overtightening the valve cover hold down nuts can warp the valve cover and upset the sealing surface.

The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
Re: Valve Cover leaking
CJDublu #1325344 Sun Sep 08 2019 07:40 PM
Joined: Jul 2007
Posts: 530
Shop Shark
The Filling Station

sells a valve silencer pad .

They were also made for V-8's

'54 3600

1954 3600
Re: Valve Cover leaking
CJDublu #1325346 Sun Sep 08 2019 08:10 PM
Joined: Jun 2011
Posts: 3,508
Shop Shark
There is also a thin, steel strap that extends either side of hold down bolts that spread pressure, obviously won't work with center bolts.


'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires.
'47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle.
'54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed.
Re: Valve Cover leaking
CJDublu #1325359 Sun Sep 08 2019 09:30 PM
Joined: Sep 2013
Posts: 1,028
Shop Shark
What I did. It works on my truck but no guarantees on yours. As Jerry suggests straighten the flange, then apply a coat of your favorite high tack gasket product to the very clean and straight valve cover and stick your new (correct) gasket to the valve cover. I like KW Copper Coat for a high tack gasket sealer. Then smear Vaseline on the clean head area the gasket seals to. Then I used a gasket in a tube product on the headside of the gasket now firmly stuck to the valve cover. Did this Two years ago, removed a couple times since with no problem and no leaks on the now well seasoned gasket.

Last edited by moparguy; Sun Sep 08 2019 09:40 PM.

1951 3600 with Clark flatbed, T5, 4.10 rear
1970 340 Duster
1990 5.0 V8 Miata (1990 Mustang Gt Drivetrain)
1951 Farmall Super A

Re: Valve Cover leaking
CJDublu #1325364 Sun Sep 08 2019 10:01 PM
Joined: Aug 2019
Posts: 13
New Guy
I had the same problem with a brand new valve cover. Company sent me a replacement and it did the same. I took a small hammer and straight edge and tapped it in t h e places it wasn't sealing. Mind you this was on a new engine install. Just take your time and check it often with straight edge. Small piece of wood helps to rest it on when hammering it.

Re: Valve Cover leaking
CJDublu #1325365 Sun Sep 08 2019 10:22 PM
Joined: Mar 2010
Posts: 9,290
Master Gabster
It would be nice to have an extra loose head laying around to use as an "anvil" on a work bench to tin smith the valve cover into perfect shape. I did this for a 216 valve cover. It was so squashed down and bowed out on the sides that I could not have fixed it otherwise.

Re: Valve Cover leaking
CJDublu #1325422 Mon Sep 09 2019 12:35 PM
Joined: Jan 2016
Posts: 564
Shop Shark
Reality is valve cover and side covers leaked when the engine were new.
Tuning the the cover, glueing the gasket and using a quality gasket helps.

I purchased an aluminum valve cover and used modern gasket cement with no gasket.
No leaks..........

Re: Valve Cover leaking
CJDublu #1325446 Mon Sep 09 2019 03:40 PM
Joined: Oct 2018
Posts: 116
Shop Shark
If none of the above solutions work for you. You could get your torch, and a brazing rod out, and just weld the cover to the head. wink

I've been plagued with those leaks from time to time. Even when I've already straightened out the cover(s) -- annoying as heck!

All the best!


'64 Chev C20 LWB stepside ( Ol'Blue )
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