Oil Leak - The 1947 - Present Chevrolet & GMC Truck Message Board Network

HotRod73 · 03-25-2006, 09:11 PM

I just discovered yesterday i have an oil leak

there is a plastic thing that is between my motor and transmission, bolts to my tranny and has a hole in the bottom... it covers the flywheel.... is it a flywheel cover??? anyways... i got oil leaking out of that hole... hope its nothing too serious... its been sitting for a few years till a few weeks ago when gpa gave to me...runs good other than this... hope its not a rear main seal

what else could it be? its not the oil pan or tranny pan gaskets....

68Stepbed · 03-25-2006, 10:26 PM

Is it bad, or is it just a drip? If a sbc doesn't leak, there's something wrong.

HotRod73 · 03-25-2006, 10:28 PM

lol well it sat last week, there is a noticable amount on the ground nothing major but takes up about the size of a sheet of paper if you lay it down

Slonaker · 03-25-2006, 11:14 PM

It sounds like oil from the rear main seal. There are instructions on 73-87.com for replacing it. If it isn't motor oil, then it is coming from the front of the transmission.

Other possibilities-leaking fom back of intake, leaking from back of valve cover, leaking from oil pressure sending unit (behind distributor on smallblocks). That one drove me crazy once until I finall found the source. It could also be the oil pan gasket.

Clean everything up and make sure you know where it is coming from before you start replacing parts. I have made that mistake too many times.

Slonaker

flyboy · 03-25-2006, 11:51 PM

Definitely start with the cheaper things first. That has saved me a couple time in the past. But you aren't really going to see what it is until you clean that underside up. I have tried to chase a leak without cleaning stuff up and ended up replacing parts when all I needed was a new oil pan gasket.

HotRod73 · 03-25-2006, 11:55 PM

alright, kinda hard but ill work it out and let you guys know what i found

karl · 03-27-2006, 04:53 AM

always check the easy things first.one other possability is the rear cam plug. but most likley the pan gasket or rear main seal. its all a process of elimination.

HotRod73 · 04-26-2006, 10:56 PM

well, i took off my plastic flywheel cover, right on the back of my motor, where the oil pan has a U shape that goes to block its leaking about right there in a small spot and i notice old oil caked on oil pan, so im ASSUMING its oil pan gasket as it leaks very slow which leads me to believe its not rear main seal or it would leak more, i could be wrong ill have to check it out more.

ureckme · 04-27-2006, 12:05 AM

see if you can snug up the pan bolt to slow down the leak

ureckme · 04-27-2006, 12:07 AM

Quote:

Originally Posted by 68Stepbed

Is it bad, or is it just a drip? If a sbc doesn't leak, there's something wrong.

my new one doesn't leak yet

piecesparts · 04-27-2006, 08:02 PM

Well, dog gone it, it looks as if that motor is shot---you are just going to have to pull it and give it to me and go buy a new one. If that does not appeal to you, then I would try tightening the pan bolts very easily and then look forward to a change out of the gasket. How many miles does that motor have on it? There may be just a gasket replacement coming or should you look forward to a rebuild.

HotRod73 · 05-06-2006, 01:53 PM

only 90k orignal miles

03-25-2006, 09:11 PM	#1
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Oil Leak I just discovered yesterday i have an oil leak there is a plastic thing that is between my motor and transmission, bolts to my tranny and has a hole in the bottom... it covers the flywheel.... is it a flywheel cover??? anyways... i got oil leaking out of that hole... hope its nothing too serious... its been sitting for a few years till a few weeks ago when gpa gave to me...runs good other than this... hope its not a rear main seal what else could it be? its not the oil pan or tranny pan gaskets....

03-25-2006, 10:26 PM	#2
68Stepbed Registered User Join Date: Mar 2005 Location: 10-Uh-See Posts: 5,609	Re: Oil Leak Is it bad, or is it just a drip? If a sbc doesn't leak, there's something wrong. __________________ Matt 68 C10 stepside, LS1/700R4, TCI Engineering suspension system

03-25-2006, 10:28 PM	#3
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Oil Leak lol well it sat last week, there is a noticable amount on the ground nothing major but takes up about the size of a sheet of paper if you lay it down

03-25-2006, 11:14 PM	#4
Slonaker Insert Witty Text Here Join Date: Oct 2002 Location: San Antonio, TX Posts: 3,415	Re: Oil Leak It sounds like oil from the rear main seal. There are instructions on 73-87.com for replacing it. If it isn't motor oil, then it is coming from the front of the transmission. Other possibilities-leaking fom back of intake, leaking from back of valve cover, leaking from oil pressure sending unit (behind distributor on smallblocks). That one drove me crazy once until I finall found the source. It could also be the oil pan gasket. Clean everything up and make sure you know where it is coming from before you start replacing parts. I have made that mistake too many times. Slonaker __________________ '86 Chevy C10 (Sold 04/19/13 ) Stock '01 Silverado Last edited by Slonaker; 03-25-2006 at 11:16 PM.

03-25-2006, 11:51 PM	#5
flyboy Registered User Join Date: Feb 2006 Location: Collin County, Texas Posts: 59	Re: Oil Leak Definitely start with the cheaper things first. That has saved me a couple time in the past. But you aren't really going to see what it is until you clean that underside up. I have tried to chase a leak without cleaning stuff up and ended up replacing parts when all I needed was a new oil pan gasket.

03-25-2006, 11:55 PM	#6
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Oil Leak alright, kinda hard but ill work it out and let you guys know what i found

03-27-2006, 04:53 AM	#7
karl Registered User Join Date: Dec 2004 Location: grand terrace , caifornia Posts: 338	Re: Oil Leak always check the easy things first.one other possability is the rear cam plug. but most likley the pan gasket or rear main seal. its all a process of elimination.

04-26-2006, 10:56 PM	#8
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Oil Leak well, i took off my plastic flywheel cover, right on the back of my motor, where the oil pan has a U shape that goes to block its leaking about right there in a small spot and i notice old oil caked on oil pan, so im ASSUMING its oil pan gasket as it leaks very slow which leads me to believe its not rear main seal or it would leak more, i could be wrong ill have to check it out more.

04-27-2006, 12:05 AM	#9
ureckme ureckmefixit2@cox.net Join Date: Dec 2004 Location: Mesa AZ. (Phoenix) Posts: 1,284	Re: Oil Leak see if you can snug up the pan bolt to slow down the leak __________________ That's U RECK ME FIX it 2 74 Chevy Short Bed 355ci Sportsman II 64cc Angle Plug Crower Custom Grind .462in .486ex Dyno Test 422hp @ 5600 And it's got a Holley 3.73 Gears 12 Bolt 3.73 w/Posi 700R4 Going In I'm a Body Man So There! That's why it's not painted

04-27-2006, 08:02 PM	#11
piecesparts Parts and more parts Join Date: Nov 2003 Location: Lebo, Kansas (middle of nowhere Posts: 6,821	Re: Oil Leak Well, dog gone it, it looks as if that motor is shot---you are just going to have to pull it and give it to me and go buy a new one. If that does not appeal to you, then I would try tightening the pan bolts very easily and then look forward to a change out of the gasket. How many miles does that motor have on it? There may be just a gasket replacement coming or should you look forward to a rebuild.

05-06-2006, 01:53 PM	#12
HotRod73 Registered User Join Date: Mar 2006 Location: Norman, Oklahoma Posts: 553	Re: Oil Leak only 90k orignal miles



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