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#1 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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New Oil pan, 350
I'm trying to fix an oil leak on my '75 350, I replaced the oil pan gasket and it's still leaking. So I'm wondering if maybe it's the oil pan, I did a quick google search and found anything from $40 to $280, It's def not a high performance motor so I don't need anything high end but I don't want to buy junk either. The leak may just be from me not putting it in right, the instructions said to just put a dot of gasket maker in the corners, anybody tried something different and had better results? Thanks Yall!
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'68 C10 LWB 6.2NA/NP833 3.73's |
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#2 | |
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Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: New Oil pan, 350
Quote:
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69 Chevy 4x4 383 Power ![]() |
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#3 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
I'm using a one piece rubber one from fel-pro, is that what you were asking?
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'68 C10 LWB 6.2NA/NP833 3.73's |
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#4 |
Registered User
Join Date: Dec 2007
Location: Santa Maria, Ca.
Posts: 1,423
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Re: New Oil pan, 350
You need to lay a straight edge across the back of the pan and measure the depth of the u shape where the gasket goes You probably have the deep pan with a gasket for the shallow pan.
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69 Chevy 4x4 383 Power ![]() |
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#5 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
Ok yeah, I have the right gasket then, I've been through that already.
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'68 C10 LWB 6.2NA/NP833 3.73's |
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#6 | ||
"I ain't nobody, dork."
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,936
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Re: New Oil pan, 350
Post this in the engine and drivetrain section.
But... is it leaking from the front? rear? side rails? High mileage engine? Gary
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'cuz chicks dig scars... My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread. The Rebuild of Creeping Death after the wreck Quote:
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#7 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
from the rear, I tightened it down as far as I felt safe doing and still not stopping.
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'68 C10 LWB 6.2NA/NP833 3.73's |
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#8 |
What?
Join Date: Jun 2007
Location: Southern California
Posts: 7,617
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Re: New Oil pan, 350
I've found that there are variations of the tin, as far as the year of manufacture for them. Things can get sloppy if you use a late model timing cover with early style pans, so I always try to keep those two pieces as a "matched set".
Chrome IMO is garbage, and are a PITA to seal. If you over tighten a cork gasket, you can actually cut it down the middle. Then when the engine gets warm, and the oil starts splashing around it will seep past. The front and rear areas are typically sealed with a thick rubber gasket that fits into a slot in either the T cover or the rear main, and for me I have always smeared on a light dressing of Permatex Aviation form-a-gasket in the groove. Then in the corners I put a nice dollop of RTV silicone, but wait for the silicone to get tacky before you put a squish on it.
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Chris 1968 K20 Suburban 1972 K10 LWB PU |
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#9 | |
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Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
Quote:
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'68 C10 LWB 6.2NA/NP833 3.73's Last edited by 1968CHEVYC10; 08-04-2010 at 10:33 AM. |
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#10 |
Registered User
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,143
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Re: New Oil pan, 350
If it's coming from the rear then it's a bad pan or an incorrect gasket install. After market no name pans are a crap shoot, do not buy a chrome one, they are the worst. If you can not afford a name brand or real GM pan from the dealer then it would be better to get a used GM pan. If it was leaking from the front then it is possibly the wrong gasket and if so it would be pouring out. Up until 1974 the oil pans used a gasket set with a thin front rubber gasket (rubber seal between pan and timing cover), 1975 and newer and most after market pans use the thick version. The only way to know for sure is to measure the depth by placing a straight edge across the front of the pan. 1 3/16 deep uses the 74 and back thin gasket set, 2 ¼ deep uses the 75 and forward thicker gasket set. Just for reference the Felpro one piece part numbers are: OS34509T for '74 & back, OS34510T for '75 through '85 and most after market pans. All pan gasket installs should begin with very clean dry surfaces (clean with brake clean) and a little dab of silicone sealer on the block at the four edges were the rails meet the end gaskets.
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1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner. 1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components. My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703 |
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#11 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
So guys I could be a very big idiot... read this: http://67-72chevytrucks.com/vboard/s...d.php?t=408834
I think I confused the rear main with just the part of the oil pan gasket at the rear. So I replaced the gasket and that fixed the leak up front but it's still leaking in the back. I currently have the pan off because I was trying to figure out why the heck it was still leaking, So now I'm wondering if I should go ahead and replace it, or put the pan back on and make sure it's the rear main and not the pan/gasket. Tell me what yall think.
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'68 C10 LWB 6.2NA/NP833 3.73's |
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#12 |
Grandpa in the rustmobile...
Join Date: Nov 2008
Location: Spokane WA/Viola TN
Posts: 11,422
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Re: New Oil pan, 350
when we did mine i smeared black rtv over the gasket and the corners , maybe just the corners idk it was late!
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John Goose-1968 C10 355,9.32-1CR, Vortec Heads ,262 voodoo, 3.73:1 3OTT (HS ride/beater/farm truck) http://67-72chevytrucks.com/vboard/s...d.php?t=317684 Grams 53-1953 Chevrolet Belair http://67-72chevytrucks.com/vboard/s...=1#post4327784 1969 Chevy C10 Shortbed 4.5/6?" Frame off resto http://67-72chevytrucks.com/vboard/s...d.php?t=548136 1999 Toyota Tacoma 4x4 |
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#13 |
member #16
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Location: Yuba City Ca.
Posts: 3,618
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Re: New Oil pan, 350
looking at pics in previous post. I would say you have a rear main seal leaking. You will have to pull the main brg cap down and replace the seal.
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john http://67-72chevytrucks.com/vboard/showgroups.php board vendors ![]() http://www.flickr.com/photos/1745471...7602865984234/ |
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#14 |
Registered User
Join Date: Aug 2009
Location: Tomball, TX
Posts: 578
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Re: New Oil pan, 350
Is there a trick to this? I took out a bolt that looked like it held the oil pump on, but the pump wasn't budging, so I went ahead got the next bolt out, it looks like there's only 3 to get out but I can't get the third one out because the oil pump is in the way.
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