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Subject: Crankshaft seal

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Tom    Posted 06-28-2019 at 10:51:54 [URL] [DELETE]        [Reply] [No Email]  
  • Crankshaft seal
  • I have a mid 1939 9n. I'm redoing it to use around the farm. I want it to be pretty, but need not be show quality. It runs really well and has 110lbs plus on all cylinders. Unfortunately it also has a major front crankshaft seal leak. I assume I have to pull the motor and split it, but is it possible to replace the seal without unbolting the rods, or doing major engine disassembly? Also, should I go with the original 2 piece rope seal, or one piece rubber? Thanks!

    K.LaRue-VA    Posted 07-01-2019 at 09:08:14 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Crankshaft seal
  • By the time you get enough stuff removed to get access to the front seal you are only about 6 bolts away from pulling the engine. I go ahead and put it on an engine stand to make it easier to work on. I've found things that made me glad I got a good look in there.

    The front seal actually seals to the crank pulley, so when the crank pulley is removed there is a little gap. I don't think that gap is wide enough to get the old seal out and new seal in without at least removing the timing cover. A sneaky-pete tool might pull the seal outta the oil pan groove but I usually end up gradually destroying the old seal rather than getting one nice big piece pulled out.

    With the engine on a stand I can be sure the job is done right. I can pull the pan, check the oil pump tube, and replace the rear seal.

    I prefer to use a one-piece seal on the front if I'm using a new crank pulley. Some of the one piece seals come with a renew sleeve. If my crank pulley is bad enough to need one of those sleeves I'm just going to use a rope seal that will conform to whatever grooves it has.

    Rustyal    Posted 06-29-2019 at 07:32:49 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Crankshaft seal
  • You should be able to change the front without pulling the engine. Especially if your not going to remove the rod caps. Use the rope seal.

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