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Subject: 8n 3point pin leak

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rusty faubion    Posted 01-14-2018 at 14:43:26 [URL] [DELETE]        [Reply] [Email]  
  • 8n 3point pin leak
  • my 3point arm on housing pin is so loose it is leaking oil. I have new pin coming. Is it possible to take housing bolts off and split it until I can get new pin in and slide it back together without taking anything else off? I hope housing is good around pin. Is this a possiblity?

    Rustyal    Posted 01-15-2018 at 07:55:04 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n 3point pin leak
  • Drain the fluid and cleaning up is the hardest part of the pin replacement. An air wrench makes the job easier.

    Farmer Brown    Posted 01-14-2018 at 21:36:27 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n 3point pin leak
  • The stud was very loose and leaking on my 9N. Since my PTO seal was leaking, I had the shaft out. I was able to reach in the PTO hole with a box wrench and had a helper tighten the heck out of it. The stud is tapered, it stopped leaking. Since the stud was loose, I assume the cotter your cotter pin inside is missing as mine was.

    charles in louisiana    Posted 01-16-2018 at 14:42:03 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n 3point pin leak
  • it is not as bad as people let on. i never did a 8n but it is the same as a jubilee that i did. drain the differential fluids remove the left tire. then use an engine lift for support of the the trumpet assy. take the trumpet off the differential . it will just slide back and the axle will come out of the differential. you do not have to disassemble the brakes,hub, drum assy. it is heavy. and you need to be careful of balance when you attach the engine lift chains. then remove the differential. it is just sitting three and slid onto the right axle. this will give you plenty of room to access the lift pin, and you can clean out the bottom of the differential housing. while the left trumpet is removed. replace the left pin also. they are not expensive. i personally put a little permatex sealer on my pins. this worksed for the jubilee, and the 1968 2000.

    Farmer Brown    Posted 01-14-2018 at 21:39:56 [URL] [DELETE]        [Reply] [No Email]  
  • Re: 8n 3point pin leak
  • Forgot to mention, my loose one was on the right side, same side as exhaust. I don't think you can do this for the left w/o trumpet removal.

    Bruce (VA)    Posted 01-14-2018 at 14:47:15 [URL] [DELETE]        [Reply] [Email]  
  • Re: 8n 3point pin leak
  • Depends on which side you are replacing.

    To stop the leak, you need to replace the pin. To do that, you need to remove the axle trumpet. If you remove the left trumpet, you can do them both at the same time. It's held on by a castelated nut w/ a cotter key on the inside.


    Drain the fluid (see tips 3 & 4, below. Resist the temptation to park it nose-down in a ditch or to jack up the rear end. If you have a bad front transmission seal, you will fill the bell housing with hydro fluid. Then you get to replace the clutch)

    Remove the left trumpet & slide the differential gear out. (an engine hoist is a good idea) Make sure the holes are not wallowed out or you will be in there again. I hear Loctite Quick Metal 660 Retaining Compound, Press Fit Repair.works.Or if the axle housing is really worn, you can use Loctite Fixmaster Fast Set Steel Epoxy, but I've never had the problem so I can't say for sure. Referring to the picture, the pin you need to replace is p/n 563. The hole which may be wallowed out is in the trumpet, p/n 4010 or 4011. The nut that holds the pin on (which is inside the differential housing) is p/n 33860-S. The cotter key is p/n 72035-S. Torque the nut on the new pin to 150 lbs before you put the cotter key in. Wipe the new trumpet gaskets w/ warm water until they are sufficiently pliable to stretch over the studs w/o breaking. Let them set a few minutes before you put them on. Make sure you use your favorite gasket sealer. Torque the 11 trumpet studs to 40 lbs.

    And, beware of mission creep: the rear end is probably full of 50+ years of crude, so have some kerosene & rags ready to clean it out!

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