Rear Main Seal
Replacing the 2 piece rear main seal on a 72 402. Original seal. Pan is off, oil pump off, and rear main cap off. Any tricks to pushing the old seal out? According to most on Youtube, etc, it is a simple process, just push it out......not so easy for mine. I have ordered a Lisle 27000 Sneaky Pete Tool off amazon in case, but not positive this will help. Thoughts or voices of experience?
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Re: Rear Main Seal
Use the cap side old half or sacrifice a new seal to start a push on the old seal. Carefully grab the tip as it begins to protrude making sure not to touch any part of the crank bearing surface with any metal. Pull on the seal in an arching manner. It it should release pretty easily.
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Re: Rear Main Seal
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Re: Rear Main Seal
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Re: Rear Main Seal
Carefully with a small round punch find the center of the seal which is a piece of metal and lightly tap it to crack it loose. I said carefully
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Re: Rear Main Seal
When we did the install of the new seal we always put some engine oil on the lip of seal prior to installing to prevent any tearing of the seal on start up.
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Re: Rear Main Seal
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Re: Rear Main Seal
Had a delay so no progress in last few days, but pushing on the metal portion of the seal, and tapping with a small punch has been fruitless so far, so next step is loosening all the main caps. I believe the issue is the fact this seal has been in there since late 1971, and then it had sat in a field since somewhere around 1983. I have obviously had it running as of the last year while I work on the truck, but started noticing the rear main leaking, so I decided to replace. Most of the gaskets, and other seals had already been replaced, along with timing set. Engine has roughly 63,000 miles. Pretty sure loosening the rest of the main caps, and maybe a little downward pressure on the crank should allow it to break free. No plans to rebuild as I do not see any need.
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Re: Rear Main Seal
I use a hard nylon drift punch vs anything metal to get it started. Loosening the other main caps and tug the crank down slightly as even just loosening the main caps, the pistons will hold it up so just give it a little tug from the rear.
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Re: Rear Main Seal
All done and pan is back on. Not an easy task, mainly due to the harding of the old seal from over 50 years. I think loosening all the main caps, then finding a tool that would allow tapping (briskly) yet not damage the sealing surface of the crank finally did the trick. Sure glad I was not pressed for time, as I went at it off and on for days, and it was best to not persist, and lose patience, and do more harm. Hopefully I do not have to do another, but not betting on it, but I am in my 60's and this was my first. Thanks to all who offered suggestions.
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