Rear Main Seal Question
 

Hey Group,
I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
is a one piece knock-in seal or is it the old two piece type where you have
to drop the pan and the last rear main cap. Just trying to plan my weekend
out.
Thanks,
Charles

Re: Rear Main Seal Question
 

2 piece.

But, way over 50% of the 'rear main' leaks turn out to be just a valve
cover leak. The engine is tilted and when the valve cover leaks it runs
right straight down the back imitating a rear main seal leak.

To check, get the engine running and wipe a clean rag behind the head,
if you find oil, you have likely found the main leak.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Re: Rear Main Seal Question
 

2 piece.

But, way over 50% of the 'rear main' leaks turn out to be just a valve
cover leak. The engine is tilted and when the valve cover leaks it runs
right straight down the back imitating a rear main seal leak.

To check, get the engine running and wipe a clean rag behind the head,
if you find oil, you have likely found the main leak.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Re: Rear Main Seal Question
 

2 piece.

But, way over 50% of the 'rear main' leaks turn out to be just a valve
cover leak. The engine is tilted and when the valve cover leaks it runs
right straight down the back imitating a rear main seal leak.

To check, get the engine running and wipe a clean rag behind the head,
if you find oil, you have likely found the main leak.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Re: Rear Main Seal Question
 

On Thu, 16 Dec 2004 17:05:37 -0600, Ervin Charles wrote:

> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Two piece, drop the pan & rear main cap. I replaced my rear main seal a
couple of months ago. Wasn't as bad a job as I expected.
88 Cherokee

Rick

Re: Rear Main Seal Question
 

On Thu, 16 Dec 2004 17:05:37 -0600, Ervin Charles wrote:

> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Two piece, drop the pan & rear main cap. I replaced my rear main seal a
couple of months ago. Wasn't as bad a job as I expected.
88 Cherokee

Rick

Re: Rear Main Seal Question
 

On Thu, 16 Dec 2004 17:05:37 -0600, Ervin Charles wrote:

> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Two piece, drop the pan & rear main cap. I replaced my rear main seal a
couple of months ago. Wasn't as bad a job as I expected.
88 Cherokee

Rick

Re: Rear Main Seal Question
 

It'll be the valve cover gasket, like Mike already attested to,
whip it off between the rear of the head and cowl, take it for a drive
and whip it again, you'll find fresh oil. If you still want to change
the seal, just for the halibut: http://www.neow.org/rms1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Re: Rear Main Seal Question
 

It'll be the valve cover gasket, like Mike already attested to,
whip it off between the rear of the head and cowl, take it for a drive
and whip it again, you'll find fresh oil. If you still want to change
the seal, just for the halibut: http://www.neow.org/rms1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles

Re: Rear Main Seal Question
 

It'll be the valve cover gasket, like Mike already attested to,
whip it off between the rear of the head and cowl, take it for a drive
and whip it again, you'll find fresh oil. If you still want to change
the seal, just for the halibut: http://www.neow.org/rms1.html
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ervin Charles wrote:
>
> Hey Group,
> I've got a 91 Jeep Cherokee with a 4.0 engine. Can anyone tell me if this
> is a one piece knock-in seal or is it the old two piece type where you have
> to drop the pan and the last rear main cap. Just trying to plan my weekend
> out.
> Thanks,
> Charles