258 Rear Main Seal
 

Well atleast i think its the rear main seal. I've got alot of oil leaking from
either the oil pan or the main. My question is how hard is it to change. Can i
just drop the pan and drop the crank down enough to change the seal? I also
hear what sounds like a bearing <sp>. The engine sounds normal at any speed
when its cold but once it warms up you can hear it...eh who knows. The good
news is I pick up my new Rubicon on monday.
haha.

Brian
88 YJ

Re: 258 Rear Main Seal
 

I doubt your rear main is leaking unless the crankshaft has some slop in it.
Yes its fairly easy to change its two piece.
KH


"Wranglerjeep1" <wranglerjeep1@aol.com> wrote in message
news:20050123005538.12769.00000207@mb-m11.aol.com...
> Well atleast i think its the rear main seal. I've got alot of oil leaking
> from
> either the oil pan or the main. My question is how hard is it to change.
> Can i
> just drop the pan and drop the crank down enough to change the seal? I
> also
> hear what sounds like a bearing <sp>. The engine sounds normal at any
> speed
> when its cold but once it warms up you can hear it...eh who knows. The
> good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

I doubt your rear main is leaking unless the crankshaft has some slop in it.
Yes its fairly easy to change its two piece.
KH


"Wranglerjeep1" <wranglerjeep1@aol.com> wrote in message
news:20050123005538.12769.00000207@mb-m11.aol.com...
> Well atleast i think its the rear main seal. I've got alot of oil leaking
> from
> either the oil pan or the main. My question is how hard is it to change.
> Can i
> just drop the pan and drop the crank down enough to change the seal? I
> also
> hear what sounds like a bearing <sp>. The engine sounds normal at any
> speed
> when its cold but once it warms up you can hear it...eh who knows. The
> good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

I doubt your rear main is leaking unless the crankshaft has some slop in it.
Yes its fairly easy to change its two piece.
KH


"Wranglerjeep1" <wranglerjeep1@aol.com> wrote in message
news:20050123005538.12769.00000207@mb-m11.aol.com...
> Well atleast i think its the rear main seal. I've got alot of oil leaking
> from
> either the oil pan or the main. My question is how hard is it to change.
> Can i
> just drop the pan and drop the crank down enough to change the seal? I
> also
> hear what sounds like a bearing <sp>. The engine sounds normal at any
> speed
> when its cold but once it warms up you can hear it...eh who knows. The
> good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

Standard response is "your valve cover gasket is leaking" The 258 is
NOTORIOUS for leaking out the back of the cover. It mimics a bad rear
seal nicely. At least one of the regulars on the NG actually replaced
the rear seal TWICE before he got at the valve cover gasket.

Wipe off the back of the head and block or, better yet, power wash it at
the self service car wash. Stick a paper towel down behind the head,
between the head and the firewall. Drive for 5 miles, bets are that it
will be completely soaked in oil.

Fixing it is simple but touchy. 3 basic choices: stock platic cover with
RTV sealant, plastic cover with expensive foam/cork gasket, or aluminum
cover with cork gasket. My personal choice is to clean cover and gasket
squeaky clean (final cleanup with carb cleaner spray), heavy bead of
RTV, set the cover on withing 5 minutes so it is still tacky, let it sit
for at least 24 hours so it cures. Works for me, lots of discussion on
what works for others. :)

Cheers.

Wranglerjeep1 wrote:
> Well atleast i think its the rear main seal. I've got alot of oil leaking from
> either the oil pan or the main. My question is how hard is it to change. Can i
> just drop the pan and drop the crank down enough to change the seal? I also
> hear what sounds like a bearing <sp>. The engine sounds normal at any speed
> when its cold but once it warms up you can hear it...eh who knows. The good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

Standard response is "your valve cover gasket is leaking" The 258 is
NOTORIOUS for leaking out the back of the cover. It mimics a bad rear
seal nicely. At least one of the regulars on the NG actually replaced
the rear seal TWICE before he got at the valve cover gasket.

Wipe off the back of the head and block or, better yet, power wash it at
the self service car wash. Stick a paper towel down behind the head,
between the head and the firewall. Drive for 5 miles, bets are that it
will be completely soaked in oil.

Fixing it is simple but touchy. 3 basic choices: stock platic cover with
RTV sealant, plastic cover with expensive foam/cork gasket, or aluminum
cover with cork gasket. My personal choice is to clean cover and gasket
squeaky clean (final cleanup with carb cleaner spray), heavy bead of
RTV, set the cover on withing 5 minutes so it is still tacky, let it sit
for at least 24 hours so it cures. Works for me, lots of discussion on
what works for others. :)

Cheers.

Wranglerjeep1 wrote:
> Well atleast i think its the rear main seal. I've got alot of oil leaking from
> either the oil pan or the main. My question is how hard is it to change. Can i
> just drop the pan and drop the crank down enough to change the seal? I also
> hear what sounds like a bearing <sp>. The engine sounds normal at any speed
> when its cold but once it warms up you can hear it...eh who knows. The good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

Standard response is "your valve cover gasket is leaking" The 258 is
NOTORIOUS for leaking out the back of the cover. It mimics a bad rear
seal nicely. At least one of the regulars on the NG actually replaced
the rear seal TWICE before he got at the valve cover gasket.

Wipe off the back of the head and block or, better yet, power wash it at
the self service car wash. Stick a paper towel down behind the head,
between the head and the firewall. Drive for 5 miles, bets are that it
will be completely soaked in oil.

Fixing it is simple but touchy. 3 basic choices: stock platic cover with
RTV sealant, plastic cover with expensive foam/cork gasket, or aluminum
cover with cork gasket. My personal choice is to clean cover and gasket
squeaky clean (final cleanup with carb cleaner spray), heavy bead of
RTV, set the cover on withing 5 minutes so it is still tacky, let it sit
for at least 24 hours so it cures. Works for me, lots of discussion on
what works for others. :)

Cheers.

Wranglerjeep1 wrote:
> Well atleast i think its the rear main seal. I've got alot of oil leaking from
> either the oil pan or the main. My question is how hard is it to change. Can i
> just drop the pan and drop the crank down enough to change the seal? I also
> hear what sounds like a bearing <sp>. The engine sounds normal at any speed
> when its cold but once it warms up you can hear it...eh who knows. The good
> news is I pick up my new Rubicon on monday.
> haha.
>
> Brian
> 88 YJ

Re: 258 Rear Main Seal
 

HaHa...yeah I've replaced the valve cover gasket about 3 times since i've owned
this jeep.....I'm positive its not the valve cover. The back side of the head
is dry. I crawled under and actually watched it drip from the back of the pan.

Brian

Re: 258 Rear Main Seal
 

HaHa...yeah I've replaced the valve cover gasket about 3 times since i've owned
this jeep.....I'm positive its not the valve cover. The back side of the head
is dry. I crawled under and actually watched it drip from the back of the pan.

Brian

Re: 258 Rear Main Seal
 

HaHa...yeah I've replaced the valve cover gasket about 3 times since i've owned
this jeep.....I'm positive its not the valve cover. The back side of the head
is dry. I crawled under and actually watched it drip from the back of the pan.

Brian