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Subject: Ford NAA crankshaft won't drop to remove old rear seal

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Joel    Posted 04-11-2019 at 10:46:23 [URL] [DELETE]        [Reply] [Email]  
  • Ford NAA crankshaft won't drop to remove old rear seal
  • I have a Ford NAA that I'm trying to replace my rear main seal on from underneath without removing the engine. I've read that you are supposed to lower the crank in order to reach the upper half of the seal. I've removed the rear cap and loosened the front and middle caps by at least a half inch, and I've even turned the crank a full turn but it still will not come down at all. I do have a front loader that runs off a pump connected to the shaft in the front and I wasn't sure if that was holding it up. Anyone have any ideas why this crank won't budge? do I have to take the oil pump off? The manual only says to loosen the cap bolts and it should just sag down. Thanks for any help

    Michford    Posted 04-12-2019 at 05:17:59 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Not trying to be negative nelly here, but getting the old round part of the rear main seal out is only half the battle. I did not have any luck trying to replace seals with the crank in place. I tried both the original stylw wedge seals that you soak in oil and they swell up, and I tried the rubber wedge seals with the metal pin you drive in. I had no luck with either. I pulled my engine to drop the whole crank to try to get it to seal. Once I did that, I found enough wear to rebuild the engine. The good news was that with the crank out and engine on a stand, it was easy to use victor reinz sealant on the side wedge grooves. When I rebuilt the engine in my 860, I used the two piece seal at the rear main, then used victor reinz sealant in place of the wedge seals on the sides of the rear main cap. 6 years and no leaks.

    Gaspump    Posted 04-11-2019 at 14:19:22 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • A real PITA but can be done like K says. I had a tool used just for that purpose. Called a sneaky Pete, think it was actually the correct name too. It was like a small corkscrew on a flexible shaft. Worked great for pulling the old seal.

    Joel    Posted 04-11-2019 at 14:22:04 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Thanks, looked into getting a sneaky pete but they were out. wouldn't matter now anyways--not enough to grab onto. just solid sludge that doesn't want to budge

    K.LaRue-VA    Posted 04-11-2019 at 13:16:23 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Crankshaft ain't going to move much with the transmission input shaft stuck in one end and an oil pump holding the other. If it did, the crank and cam gear teeth would slip apart and the only way you'd get the crank and camshaft timed right would be to remove the front cover so you can see the marks. Pushing the clutch pedal should allow the back end to drop a tad.

    With the caps loose, it should be possible to pull the upper half of the rope seal out. I've done that by threading a large wood screw into one end of the seal and using the screw as a handle to pull it out. Pushing on the other side while pulling the screw helps. Putting the new seal in is just as much fun. In that case, a long piece of cotton twine can be run over the crank, soak the new seal in oil and start the new seal in one side while pulling the twine thru in the same direction.

    Joel    Posted 04-11-2019 at 14:20:02 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • thanks, tried all that. I thought it would at least drop an 1/8." I don't even have a 1/16. The rope is so fried it just crumbles when I try to screw into it. Not much left there but what's left doesn't want to come out--like sludge packed int tight.

    K.LaRue-VA    Posted 04-11-2019 at 14:29:52 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Look around for one of those flexible shaft drivers or cannibalize a flex shaft off something. Most Dremel tool sets have one. The end may be too large, cut it off and you have a flexible punch that should be able to drive the old seal out no matter how cooked it is.

    The front of the crank is also held by the front seal, so be careful you don't mess that up and create a new leak.

    Joel    Posted 04-11-2019 at 17:45:23 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Thanks for the idea. I tried it, but the flex shaft was too flexible to use as a punch. I even used a mechanical pencil shaft to try to hold it straight while tapping it, but just wouldnt work. On the other hand, I flared out some of the wiring on a piece of the dremel flex shaft and put one end in my driver and used it like a drill. It almost works--very slowly cuts it out but gunks up too fast to make it very effective. Guess I'll just keep trying stuff. Hate to see it stuck in my driveway.
    thanks

    K.LaRue-VA    Posted 04-12-2019 at 09:38:44 [URL] [DELETE]        [Reply] [No Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • It might be worth a trip to harbor freight to see if they have something with a different type flex shaft. I think the one I have was for adjusting dwell on an old GM distributor. They used to have a window to adjust dwell with engine running. I cut the socket end off and can whack on the handle with a hammer. When the seal area is wide enough I slip a thin blade from a set of feeler gauges in there to protect the crank surface. The tool Gaspump mentioned really is called a Sneaky Pete. At least that is what Lisle calls it (Lisle 27000). Looks like Advance Auto parts carries Lisle tools, but my experience with them usually involves going to 5 different stores to find one that actually has what I need in stock.

    Kimberly    Posted 04-11-2019 at 18:04:42 [URL] [DELETE]        [Reply] [Email]  
  • Re: Ford NAA crankshaft won't drop to remove old rear seal
  • Sounds like you have a real PITA. Just keep prodding and poking and trying different things until you get the old gunky seal out. I wish I had some suggestions but I don't. When I put gaskets on the oil pan, I can't remember what I did about the rear; I may have left it in. The engine had been rebuilt so I was thinking it was replaced by the person that did the rebuild. He used the wrong gaskets for the oil pan so that is why I had to drop the pan; it started leaking at both front corners. For the front, I replaced the worn crank pulley and install one of the new doughnut replacements for the front seal.

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