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#1 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Hey truckers,
I've been living with a bad oil leak on my 307 for a while now, at the front of the oil pan where it meets the timing cover. Last night I removed the oil pan by raising the engine, cleaned and scraped thoroughly, then installed a nice one-piece silicone gasket and tightened up the bolts not-too-snug. The dang engine leaks the same! Please watch this video and evaluate, Where is the leak coming from, out of the timing chain cover? Is the U-bend of the oil pan not snugging up (but it didn't leak this bad before)? Thanks for your help! |
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#2 |
Senior Member
![]() Join Date: Sep 2005
Location: Lewisville, Nc
Posts: 10,234
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Re: Big Leak trouble, Help! Video of oil leak
Depending on he pan it could be warped. But also there are 2 different gaskets a thin gasket and a thick gasket most 75 up use the thick gaskets as do most after market oil pan
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David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube |
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#3 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Big Leak trouble, Help! Video of oil leak
Okay, so the chrome pan is definitely aftermarket. I did notice that I can see an awful lot of the gasket in front. I didn't have an option to buy a "thick" gasket at the store, but should I just swap pans with an OEM one? I can re-use the gasket too.
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#4 |
Senior Member
![]() Join Date: Oct 2010
Location: Cadiz, Ky
Posts: 512
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Re: Big Leak trouble, Help! Video of oil leak
I have always had leaks with the chrome timing covers and oil pans. They never seem to be the right fit. I would change both of them for original styles.
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1972 Chevy LWB Roadster 1999 Chevy Silverado 2wd 2015 Chevy High Country 4x4 Crew Cab |
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#5 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Big Leak trouble, Help! Video of oil leak
I found this thread, the 2nd post explains there's a different gasket for aftermarket oil pans. Should I get this gasket or a new old pan? http://forums.corvetteforum.com/c1-a...-at-front.html
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#6 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Big Leak trouble, Help! Video of oil leak
I'm off to buy the thick 34510 gasket now! I'm confident that's the problem!
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#7 | |
Registered User
Join Date: Aug 2009
Location: Australia
Posts: 275
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Re: Big Leak trouble, Help! Video of oil leak
Quote:
The oil pan changed somewhere in the mid 70's I believe, and all aftermarket and repro pans are modeled after that later, wider ended pan. The difference is slight ... probably be no more than 1/8" - but enough to cause dramas. Here's the original on my '67 small block: ![]() And here's the aftermarket: ![]() |
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#8 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Big Leak trouble, Help! Video of oil leak
This gasket is a lot thicker, I can't wait to bang my fingers and get oily again!
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#9 |
PROJECT 7DEUCE
![]() Join Date: Dec 2002
Location: GRANTS PASS OR
Posts: 21,608
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Re: Big Leak trouble, Help! Video of oil leak
Hope the new pan gets her al sealed up..
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GO BIG GREEN ![]() MEMBER #6377 72 k-5 daily driver 6'' lift 35'' 350-350-205 slowly getting rust free. Project "7DEUCE" check out my build http://67-72chevytrucks.com/vboard/s...d.php?t=267665 Tim Powell..R.I.P EastSideLowlife..... R.I.P.. |
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#10 |
Registered User
![]() Join Date: Sep 2010
Location: Formerly MD and San Diego, now loving life in Arizona
Posts: 1,636
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Re: Big Leak trouble, Help! Video of oil leak
Ive always had great success using Permatex Aviation sealant brushed onto the gasket surface before installing gasket. It sticks like glue and never hardens. It is also oil and detergent resistant so it will stay in place and seals like a champ.
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Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB |
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#11 |
Registered User
Join Date: Dec 2011
Location: winnipeg
Posts: 1,107
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Re: Big Leak trouble, Help! Video of oil leak
The ultra thick gasket you have only fits a certain style of pan I tried to use one of those once and it was too thick to allow the pan to seal on the rails. Your vid is not working now so I can't see your pan.
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#12 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
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Re: Big Leak trouble, Help! Video of oil leak
It looks like the timing cover is bent or broke. If you look closely to the left side of the drip it looks like the entire gasket has a coat of oil on it that appears to me to be coming out from under the front cover. It is running down the gasket and dripping off of the corner of the gasket where it meets the pan lip.
Last edited by sprint_9; 12-31-2013 at 06:39 PM. |
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#13 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Well I installed the 34510-T gasket and it stopped the leak!! This gasket is much thicker on the front. After driving it 25 miles on errands, under inspection it hasn't dripped! I noticed a small oil buildup so that could be a small seepage but nothing to worry about any longer. Woohoo! Happy new year!!
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#14 |
Registered User
Join Date: Jul 2011
Location: WV
Posts: 946
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Re: Big Leak trouble, Help! Video of oil leak
Glad you got the leak stopped. One thing I noticed on the video was the harmonic balancer. It actually looks like the outer ring is loose. Would definitely check that thing over good.
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72 GMC C2500 402/Th400 first truck (still have) 77 GMC C3500 CC dually Sold ![]() 70 C50 dump truck "Rusty" 87 K10 Suburban Sold 93 K2500 xcab 6.5TD 96 GMC K2500 Suburban 6.5 TD |
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#15 |
Registered User
Join Date: Nov 2012
Location: 9
Posts: 862
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Re: Big Leak trouble, Help! Video of oil leak
Hmm must have been the video making the timing cover look suspect to me. In the picture you posted it looks great.
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#16 |
Registered User
![]() Join Date: Sep 2010
Location: Formerly MD and San Diego, now loving life in Arizona
Posts: 1,636
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Re: Big Leak trouble, Help! Video of oil leak
I never knew the difference in the pan shapes and the gasket requirements, guess I have been lucky enough that everything lined up and fit properly. Thanks for sharing your experiences with us and highlighting the fix.
Happy truckin'!
__________________
Alan 2012 Ram 3500 Dually Crew Cab 6.7 Cummins 2014 Palomino Columbus 340RK 5th wheel '69 Chevy C10 396BB |
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#17 |
Registered User
Join Date: Dec 2008
Location: San Francisco, CA
Posts: 144
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Re: Big Leak trouble, Help! Video of oil leak
This was a big lesson to learn, thanks for all y'all'ses help
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Tags |
307, leaking oil, oil, small block, step-side |
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