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Yesterday, 03:37 PM
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#1 |
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Registered User
Join Date: Jul 2021
Location: Tioga Pennsylvania
Posts: 31
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Rear engine oil leak question
Unfortunately after a had my ‘72 350 rebuilt by a friend it developed an oil leak at the rear of the engine. I believe it is the rear gasket of the oil pan, however I would like to confirm it’s not the rear main seal as well. Would the crankshaft be “wet” if the rear main was leaking? I haven’t noticed anything on the crank.
It’s probably hard to tell from an image but there is oil at the corner where the rtv ends. But I haven’t noticed any oil running down the back of pan either, it was originally running (a few drips after running the engine) down the front facing sheetmetal piece of the bell housing cover (sm465). |
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Yesterday, 03:40 PM
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#2 |
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Registered User
Join Date: Jul 2021
Location: Tioga Pennsylvania
Posts: 31
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Re: Rear engine oil leak question
I should also add that he struggled to find a rear/front gasket piece for the oil pan that fit right. Hence the sloppy look. There is another spot on the oil pan the leaks as well. So at the very least the oil pan is coming over to replace the gasket.
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Yesterday, 03:48 PM
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#3 |
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Registered User
Join Date: Jul 2021
Location: Tioga Pennsylvania
Posts: 31
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Re: Rear engine oil leak question
Another pic after running. Definitely leaking at the oil pan seal at least, oil can be seen at the rear pan lip.
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Yesterday, 04:20 PM
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#4 |
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Registered User
Join Date: Dec 2017
Location: Elkhart, Texas
Posts: 1,865
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Re: Rear engine oil leak question
That's a goopy mess.. Redo the installation and use the proper pan gasket set, and not so much gasket sealant....
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Yesterday, 10:01 PM
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#5 |
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Post Whore
 
Join Date: Feb 2016
Location: Portland Oregon
Posts: 11,475
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Re: Rear engine oil leak question
It is difficult to do with the engine in the truck but after removing and cleaning, dry fit the pan to the block and inspect it to see the pan fits flat and square.
If you not pulling the engine to reseal the pan, try test fitting your pan on a different block that's not installed to verify the fit. Oil pans can take a lot of abuse and many new ones just don't fit correctly.
__________________
Thanks to Bob and Jeanie and everyone else at Superior Performance for all their great help.  RIP Bob Parks. 1967 Burban (the WMB),1988 S10 Blazer (the Stink10 II),1969 GTO (the Goat), 1970 Javelin, 1952 F2 Ford OHC six 4X4, 29 Model A, 72 Firebird (the DBP Bird). 85 Alfa Romeo If it breaks I didn't want it in the first place The WMB repair thread http://67-72chevytrucks.com/vboard/s...d.php?t=698377 |
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Yesterday, 10:08 PM
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#6 |
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Senior Member
Join Date: Jul 2010
Location: South Dakota
Posts: 4,099
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Re: Rear engine oil leak question
Looking at the picture I would guess that's where it's leaking. I bought a reusable felpro one piece gasket that has no leaks for nearly 15 years.
__________________
1969 Chevy c20(Miss Hackjob) |
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Yesterday, 11:01 PM
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#7 |
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Senior Member
Join Date: Jun 2022
Location: San Ramon,CA
Posts: 638
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Re: Rear engine oil leak question
Those little blue clippy things that come with the Fel-Pro silicone gasket really help keep it from getting distortedf
__________________
1970 C10 Custom longbed 350/350 Code:
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Today, 11:38 AM
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#8 |
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Senior Member
Join Date: Nov 2018
Location: Waterford California
Posts: 2,657
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Re: Rear engine oil leak question
As HO55 said those pans have taken a lot of abuse over the years, a new thicker one can be had for less than a $100 and a stock shaped aluminum for $150 or so. That and a 1-piece gasket should solve the problem, unless it is the rear main leaking.
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