The Stovebolt Site Forums The Shop Area Engine Shop Throwout bearing. pilot bearing?

Hi guys, new to the board, but I've been reading and gaining knowledge from this board for about a year. It's great!

I finally registered because I have two questions. I just had my 250 rebuilt and I'm in the process of reinstalling it. My questions have to do with installing the clutch. Of course in my rush to get the engine to the shop, I pulled of the clutch without noting anything.

Q#1: On the throwout bearing, there is a raised hump in the outside groove. Does this hump go between the fork fingers or outside of the fork fingers?

Q#2: The new clutch set came with a sleeve or bearing about 3/4" long, funny, when I took off the old clutch this part was and is no where to be found. Do I install it? or was it made for a different model? where does it go?

Any help would be appreciated.
Dano

Not quite sure I understand the first question--do you have any pics?

The reason you didn't see that brass bushing when you took the clutch apart is because it's located in the back of the crankshaft. The nose of the transmission rides inside this bushing, to keep it lined up with the engine during accleration, etc. I guess if you had a new crank put in, you won't have to worry about getting the old one out--just drive the new one in. Do you already have the motor in the truck? If so, replacing this bushing will be a bit harder than if it is still on the stand. Several ideas on removing the old bushing:

1. pack the cavity full of grease, find a rod, pin, etc. close to the same size as the hole, drive the pin into the hole, and let the grease force the bushing out. If the motor is out of the truck, this might work, but I've never been able to do it in the truck.

2. get a pilot bearing puller, like this one from matco.

3. take a die grinder and grind the old one out, but just don't hit the crank!

The hump if I understand you correctly would go in the fork, it is used to keep that inside of the throw out bearing form turning.

One note about using the grease in the pilot bushing. If you go this route, please place a rag around the dowel rod so you don't spray grease everywhere one the bushing is free.

Good luck and welcome to the bolt!

Another way to remove a pilot bearing, or bushing, is to get a tap just a little larger than the hole in the pilot and screw it into the pilot. As the point comes into contact with the crankshaft and bottoms out, the pilot will begin to move outward and soon drop out of the end of the crank.

Hey 6! That's too easy, it has to be cheating! (Why the heck didn't I think of that one?)

6Cly, I can't resist asking what kind of tap you are going to use on a bearing? Those races are pretty hard

This trick sure works great on bushings, though.

Joe

Instead of grease to pack the cavity, use wet toilet paper. Works just as well and cleanup is a lot easier.

Joe Way,
I called the pilot bushing a "bearing" only as a point of reference because big61fourby referred to it as a bearing when writing, "GET A PILOT BEARING PULLER, LIKE THIS ONE FROM MATCO." I have never tried to use a tap to remove a bearing :confused: , might be able to be used on a small new plastic bearing holders :p , however, the point is, Joe Way, that a tap will do an excellent job of pulling a bushing :rolleyes: !

Chuckthetruck: If I understand you correctly your are RECYCLING your TOILET PAPER and using it to REMOVE PILOT BEARINGS?

Gawd......I'm not about to ask what your doing with your old condoms. :rolleyes:

Thanks guys! Luckily the engine rebuilder must have removed the old bearing for me. I'm just having a hell of a time driving the new bearing in. It's midnite here on the left coast so I'll try again tomorrow morn.

Again thanks for the grease/TP/Tap solution on driving out them old bearings!

Dano

try putting it in th efrezzer and then installing it.

Play doh is even better than grease or wet TP in the cleanup department. Just don't give it back to your kid when you are done.