Upper Rear Main Seal 18-6335

Zeke3

Zeke3

Well-known member
I have a 1937 21 stud engine with the 18-6335 upper main seal. What is the proper way to remove the seal? I was thinking if I tapped it on one end I would be able to roll the seal out of the block. I thought I should ask for advice before inflicting possible damage to the seal. Can the seal be reused?

Thanks, Zeke
 
Terry, my block has the 18-6335 upper rear main seal as shown in the service bulletin in the link you attached and the rear main cap is not machined for the lower seal, 78-6336, as discussed in the link. I think the 78-6335 and 78-6336 parts were a later model year addition.

My engine did not come with my car originally, so I have no idea of when it may have been produced.

I have the reprints of the 1932-37 service bulletins and the 1938-1941 service bulletins, but I could not find the bulletin that Brian provided in either of those publications.

Thanks for your reply, I always pay attention to your posts.

Zeke
 
Your proposed removal method is correct...they can sometimes be very stubborn to move. They are originally fitted with a sealer; depending on the sealer, they can sometimes be almost impossible to remove intact. If you are successful in removing it without damage, yes, you can reuse it. good luck!
 
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