replacing a thrust bushing

[healeyboz]

If you notice I have been posting some threads lately and haven't been on in awhile. Getting ready to dive into some more work on the sprite and fix some things that were overlooked and or "need" improved. I have always said that this forum is the best for thinking things out by talking about it and a great source to find good sources for parts!!

Thanks again,

The tranny is making a noise and it was suggested that it could be the "thrust bushing" in the rear end of the crank. The stupid thing is that I didn't even know that it was there. Never replaced one and never had a problem until I started having these noises last summer. Either the problem is with this bushing or with the mechanical clutch bits. 1100 miles on the new motor should give some wear marks to help affirm my thoughts. Anyone replace these bushings and know where to get a quality one so I don't have to have another engine pull in the next few years? I looked at a buddy's 1275 that we are building and saw what it is. How are they "supposed" to be removed/installed?

 

[spritenut]

I assume you mean the "pilot bushing" in the end of the crankshaft.
There are several ways to remove it, I just did one yesterday on a 1098.
I used a screwdriver as a chisel and cut a slot through it and it fell out.
This one was in bad shape and crumbled easy.
New or good ones can be removed with simple hydraulics.
Pack the bushing with grease, use a suitable drift, insert it in the bushing, smack it with a hammer and it will jump out on the drift. A 1/4" drive deep 7/16" socked makes a close drift, just use an extension on the end of the socket to fill the hole.
New bushings should be soaked in oil overnight before installing.
Again a larger drift (or socket) and it will tap right in. Make sure it goes in straight.

 

[Trevor Jessie]

Are you talking about the pilot bushing in the end of the crank?

 

[aeronca65t]

I like Frank's mention of using grease to get out a pilot bearing. I've done the same thing and it works great!

But in case you're talking about "thrust washers", that is a different job.

I forget if the upper TW can be be removed with crank in place (and engine in car). I've always done it when the engine is out. You can see it here as "#12"

 

[healeyboz]

Pilot yes. Don't know where thrust came from.

Nial, do you mean 19?

 

[aeronca65t]

No, Barry. I meant #12.

#12 is the thrust washer.

Frank's comments on the pilot bearing (sometimes called "pilot bushing") are correct.
Unfortunately, the engine must come out to replace this.

 

[Hap Waldrop]

Thrust bearings never wear out on A-series engines, now pilot bushing yep, there are two designs on the 1275s the the thin oil lite bronze one and then some of the later 1275muse the roller bearing.On the o-lite bronze bushing you should soak in motor oil for a few hours before you install it.