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Old August 5th, 2009, 12:51 PM   #1
boggi
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Default help changine rear main oil seal, 351m

like the title says, im getting a '79 bronco with a 351M and bad rear engine oil seal, and i never done this before and id like to be educated on it.

so far i know that with the M version of the 351 you dont have to remove the trans, i just haul off the base pan, and slide it through? but how does it come off and what do i have to slide it over? and how do i go about putting a new one on?

thanks alot guys, and im getting the truck on friday for a project truck,
thanks
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Old August 5th, 2009, 12:53 PM   #2
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Good luck with replacing the seal. From what I understand it is a PITA to change on most vehicles.
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Old August 5th, 2009, 12:58 PM   #3
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well the previos owner said it only takes a couple hours, and not much to it, and another site said it isnt to bad, the only PITAS are with teh other engiens that u gtotta remove the trans on
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Old August 17th, 2009, 11:25 AM   #4
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It has been a long time since I did it but IIRC I undid the motor mounts and raised the engine putting some chunks of 2x4 between the motor mounts. Drop the pan then loosen all of the main bearing bolts, remove rear main cap push old half of seal out of block with new seal install other half in main cap retorque all of the bearing cap bolts and put everything back together. Disconnect battery cable as I seem to remember something about engine cranking over when I jacked it up.
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Old August 17th, 2009, 11:32 AM   #5
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thats about it! when i did it i put a small amount of high temp rtv on the ends that butt together make sure you clean everything really good. I'm not sure about fords but when i rebuilt my 350 napa offered a seal that had an offset sealing lip to contact the new never worn part of the crank which is a good idea. Take your time and clean everything good and hopefully you wont have to pull it apart in a month to try it again
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