I have been about to pull my hair out with my 64 rear main seal leaking. I have had it replaced twice and to no avail it still is dripping. I have had to engine rebuilt twice and I have to believe that all parts were replaced when rebuilt but not totatlly 100% sure. My mechanic says that it could be the thrust bearing could possibly be bad cause he did say there was more than usual movement in the crank that he was use to seeing...could he be possibly right about that? I just don't want to go to that expense unless I am sure it will resolve it. I no you can make no guarantees, but with your experience with these year models, you might have some inside info that I am not aware of...

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Comment by Russ Austin on October 6, 2019 at 10:14am

A special tool is described in the shop manual. It guides the upper rear main seal into place so the sealing surface does not get shaved off. Don't use it, and a leak is about guaranteed, as you know. 

I don't see the crank moving back and forth as an issue, as the surface is the same. 

Comment by Kim K Kaiser on October 5, 2019 at 11:03pm

i can feel your pain, brother,!!!!  I'm in middle of replacing one now..

Comment by Tony and Ginny 429 on October 5, 2019 at 9:11pm

James 

We just did a thread on the rear main seal leaking and Kim is in the process of putting the bottom of his engine black together after he replaced the rear main seal to see the results 

Many have different degrees of a problem with the rear seal leaking in our year cars 

It SB good reading just to learn more about the subject 

The info is on the current Dashboard page 

Enjoy 

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