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meteor

rear main seal

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What is the best way to replace the rear main seal on a 1940 special 248? The repair manual is not giving

me much information.

Thanks, Meteor

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Thanks 39 Buick, That's a great site. I have the service and repair manual for my 1940 Buick.

I was hoping to get a response from someone who has replaced the seal so I could get some

advice and issues that may turn up.

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He wasn't pointing out the '42 manual because he thought you needed a manual--he was pointing out a better manual that you should use. The '42 manual has a much more detailed and useful section on the procedure than your '40 manual.

 

It's a rope seal. There are tools you can buy to snake the seal in there. You'll have to drop the pan and it will likely take some practice to get it in there properly, but it's not terribly difficult. Pre-soak the rope seal so it's flexible and slides into place easily. They're cheap, maybe buy two just in case the first one gets mangled while you practice.

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Thanks Matt, I did not realize the 42 manual was more detailed. That is great I will check it out right away.

The 40 manual does not have any info on the seal. I thought I would have to pull the trans. Thanks again

for the help. Meteor

 

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Meteor, back in the `60s I had a Chevy 265 with a leaking rope seal. The main cap piece was easy to replace, but the piece in the block, not.. J C Whitney sold a repair kit that had nail like pins to install in the upper rope to tighten it and was actually an easy fix. I also had another kit around the same time that had a special tool that was similar to a Chinese finger puzzle with a pull handle on one end for installing the block portion of the rear seal. It also worked good, biggest problem was getting the old upper piece removed.  Telling this sure disturbed some brain cells..  Tom

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Ben, Thanks for that website. Added it to my favorites list, very informative. That rear seal looks like a tough job.

Think I will keep an eye on the leak and monitor it and if it gets worse I will try the repair. Meteor

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