main seal - The 1947 - Present Chevrolet & GMC Truck Message Board Network

1966FLEETSIDE · 04-13-2013, 11:39 PM

my 327 is leaking oil,how do i find out if its leaking from main seal.and if so,how dificult is it to replace it?

Rufton · 04-14-2013, 12:39 AM

I guess the first step is making sure it's not valve cover, intake or tranny.
There is a chance ( I'm guessing 1 in a 1000 chance) a high mileage oil w/ seal conditioner or just seal conditioner will help unless the seal has hardened too much.
A 2 piece procedure is dropping pan then rotating upper half out by pushing w/ something like a chop stick. Then rotate new one in.

1966FLEETSIDE · 04-14-2013, 12:48 AM

thx rufton.well i did change valve cover gaskets and tranny,how do i know if its main or just oil pan.

Rufton · 04-14-2013, 01:13 AM

Quote:

Originally Posted by 1966FLEETSIDE

thx rufton.well i did change valve cover gaskets and tranny,how do i know if its main or just oil pan.

That's a good question but have to drop pan either way. Seal leak may sling oil inside bell; pan may not.

Can snug pan bolts just don't bend it; slight chance that will help.

donthekawguy · 04-14-2013, 01:15 AM

Mine is leaking like crazy also. I'm just waiting till I'm motivated enough to fix it. lol

Tx Firefighter · 04-14-2013, 07:45 AM

The first step to fixing any oil leak is to get the engine clean. Real clean. Then get under it and look for where its coming from. You can't diagnose anything with oil all over it.
Posted via Mobile Device

brokenspoke · 04-14-2013, 08:13 AM

The rear of intake manifold or oil pressure line would be my first check

1966FLEETSIDE · 04-16-2013, 12:09 AM

thanks to all of you for the great tips.

04-13-2013, 11:39 PM	#1
1966FLEETSIDE Registered User Join Date: Mar 2013 Location: central coast monterey county california Posts: 348	main seal my 327 is leaking oil,how do i find out if its leaking from main seal.and if so,how dificult is it to replace it?

04-14-2013, 12:39 AM	#2
Rufton Registered User Join Date: Apr 2013 Location: Knoxville TN Posts: 1,170	Re: main seal I guess the first step is making sure it's not valve cover, intake or tranny. There is a chance ( I'm guessing 1 in a 1000 chance) a high mileage oil w/ seal conditioner or just seal conditioner will help unless the seal has hardened too much. A 2 piece procedure is dropping pan then rotating upper half out by pushing w/ something like a chop stick. Then rotate new one in.

04-14-2013, 12:48 AM	#3
1966FLEETSIDE Registered User Join Date: Mar 2013 Location: central coast monterey county california Posts: 348	Re: main seal thx rufton.well i did change valve cover gaskets and tranny,how do i know if its main or just oil pan.

04-14-2013, 01:15 AM	#5
donthekawguy Registered User Join Date: Aug 2012 Location: Rathdrum ID Posts: 1,129	Re: main seal Mine is leaking like crazy also. I'm just waiting till I'm motivated enough to fix it. lol __________________ 66 shorty

04-14-2013, 07:45 AM	#6
Tx Firefighter Watch out for your cornhole ! Join Date: Jun 2003 Location: Azle, Texas Posts: 14,162	Re: main seal The first step to fixing any oil leak is to get the engine clean. Real clean. Then get under it and look for where its coming from. You can't diagnose anything with oil all over it. Posted via Mobile Device

04-14-2013, 08:13 AM	#7
brokenspoke Registered User Join Date: Jul 2011 Location: Anderson, Texas Posts: 535	Re: main seal The rear of intake manifold or oil pressure line would be my first check

04-16-2013, 12:09 AM	#8
1966FLEETSIDE Registered User Join Date: Mar 2013 Location: central coast monterey county california Posts: 348	Re: main seal thanks to all of you for the great tips.



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