!983 CJ7 258 rear main seal and oil pan gasket - JeepForum.com
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post #1 of 23 Old 09-02-2020, 02:54 PM Thread Starter
NealR
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1983 CJ7 
 
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Thumbs down !983 CJ7 258 rear main seal and oil pan gasket

Hi All

I'm trying to clean up some of my oil leaks. I've replaced my plastic valve cover with aluminum and recently did and REDID my rear main seal and oil pan gasket. I continue to have a heavy leak at the rear of my engine near the bell housing. Any thoughts? I'm thinking I need to redo the rear seal again.


Thanks for everyone who posts their how to videos. How did we ever work on cars before the internet?

Neal

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post #2 of 23 Old 09-02-2020, 03:01 PM
agear
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Quote:
Originally Posted by NealR View Post
Hi All

I'm trying to clean up some of my oil leaks. I've replaced my plastic valve cover with aluminum and recently did and REDID my rear main seal and oil pan gasket. I continue to have a heavy leak at the rear of my engine near the bell housing. Any thoughts? I'm thinking I need to redo the rear seal again.


Thanks for everyone who posts their how to videos. How did we ever work on cars before the internet?

Neal
Did you use the 1 piece oil pan gasket ? Its pretty much a must have . It comes with dowels that hold the gasket then the oil pan in place so it will help with that curve or hump on the back of the oil pan and gasket
Did you use the dab of rtv on the rear main seal where the top half of the seal touches the bottom half of the seal when bolted up.
Also the lip has to face the front of the block. The part that goes in the bearing cap only goes one way and the top half has to match that. Gotta picture of the leak ? How bad is it ? Some people just say tte 258 rear main seal just leaks

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #3 of 23 Old 09-02-2020, 03:45 PM Thread Starter
NealR
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I used a one piece FelPro blue plastic oil pan gasket which included the plastic studs. I used RTV very very sparingly near the timing chain and block and a little in the rear. I didn't redo the main seal because I thought it was oil pan gasket. But when I did the rear seal it was a two piece FelPro gasket which I used a RTV sparingly again. I don't mind doing the job a third time but I really don't want to do it a fourth or fifth. hahahahaha I want to move onto the front seal. Maybe I installed the seal backwards but I'm a little OCD and I don't think I did.

On the RMS I added RTV to the outer edges (narrow sides only ) and very modestly applied.


Thanks, Neal
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post #4 of 23 Old 09-02-2020, 06:33 PM
JEEPFELLER
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Something like this?

----JEEPFELLER
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post #5 of 23 Old 09-03-2020, 09:05 AM
PhillyCJ7
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I did mine over the winter and have to confess that I was pretty nervous about doing it. I found and followed this and it worked great, no leaks first time.

https://forums.4wdmechanix.com/topic...l-replacement/
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post #6 of 23 Old 09-03-2020, 09:06 AM Thread Starter
NealR
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Thanks......Sort of like that. I only added the RTV to the chamfered edge. Thanks for the picture! Do you happen to have a picture of where lese to add the RTV. Timing belt, oil pan?

Thanks again

Neal
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post #7 of 23 Old 09-03-2020, 11:26 AM
JEEPFELLER
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I do use RTV, but sparingly on fewer parts, see post 9 in this link https://www.jeepforum.com/forum/f8/g...stion-4407599/

Most other gaskets -----I call flat paper gaskets---like timing cover, water pump etc, or flat thin cork---like oil pan (I use the new type pan gasket now dry--with no goop added)

Them flat paper gaskets---I use "Gasket Shellac"---It has other names, like "Indian Head", usually found in the gasket rolls/ RTV section. The pic below makes it look like a lot, in reality it's like smearing molasses on there, I use it on both sides.

----JEEPFELLER
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TRANNY 3 040.jpg   TRANNY 3 043.jpg  
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post #8 of 23 Old 09-04-2020, 09:25 AM
PhillyCJ7
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I did use a little bit as per the directions on the oil pan gasket.
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post #9 of 23 Old 09-04-2020, 10:49 AM Thread Starter
NealR
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Thanks for all the help! Would you advise reusing the new/old RMS and oil pan gasket or should I purchase new gaskets?

Neal
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post #10 of 23 Old 09-04-2020, 11:01 AM
PhillyCJ7
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For my $$, the cost in time and aggravation if you have to do it again vs the cost of new gaskets upfront ALWAYS tips heavily in the favor of new gaskets for me. I always ask myself this, if I do try and reuse the old one and if it fails how much would I pay to NOT have to do it again. Almost always it is more than the cost of new parts.
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post #11 of 23 Old 09-04-2020, 02:58 PM Thread Starter
NealR
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Alright then. I'll purchase some new gaskets and get after it once the holiday weekend passes. I'll be sure to get back to you guys and let you know how it goes....Again hahaha

Thanks for all of your input and assistance.
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post #12 of 23 Old 09-04-2020, 04:31 PM
agear
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Originally Posted by NealR View Post
Alright then. I'll purchase some new gaskets and get after it once the holiday weekend passes. I'll be sure to get back to you guys and let you know how it goes....Again hahaha

Thanks for all of your input and assistance.
Dyou have the receipt for your seal and gasket . If they're leaking , they're defective and come with a warranty

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #13 of 23 Old 09-04-2020, 04:37 PM Thread Starter
NealR
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I have the receipt but i think it was myfault and not the fault og FelPro or Napa.
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post #14 of 23 Old 09-09-2020, 12:44 PM
agear
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How did it go ?

1984 jeep cj7, 258 I6, rebuilt T176,rebuilt Dana 300, amc 20 , dana 30, 4.10's Trac-lok in rear , 4.10's detroit soft locker in dana 30, 2.5 inch bds suspension lift, 1 inch polyurethan body mount lift. Line ex. weber carburetor. factory tach. factory clock ,oem replacement speedomter cluster, and oil pressure gauge, factory volt gauge.
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post #15 of 23 Old 09-09-2020, 12:56 PM Thread Starter
NealR
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Sorry I didn't get back to you sooner. My son and I went backpacking over the weekend and when I returned home Pacific Gas and Electric had our power turned off for 2 days. The power came on about an hour ago. My plan is to get under the Jeep tomorrow. I'll let you know as soon as I'm done. I'm feeling pretty confident it will turn out to be the rear main seal and me not properly adding the RTV where the upper and lower gaskets meet. . I hope everyone had a great holiday weekend.

Neal
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