Bushing replacement

I just received the bushings for my trans and new main shaft.
How do you get the bushing out of the kick shaft?
The other bushings for the gears can be pressed out and I imagine installed by heating the gears and freezing the bushes, right. But how do I get the kick bush out?

Guido said:

I just received the bushings for my trans and new main shaft.
How do you get the bushing out of the kick shaft?
The other bushings for the gears can be pressed out and I imagine installed by heating the gears and freezing the bushes, right. But how do I get the kick bush out?

Click to expand...

I took it to a machine shop. They have a pilot bearing tool typically used for cars. There are several other ways to get it out. Everything from cutting it out (dangerous) to forcing it out with grease (messy). For me I was having them ream one of the other gear bushes so I just had them take that one out while I was there.

Bore it out on a lathe.

1st gear and kick start are fixed bushings.
When new, the other two are double slip...like a turbo bushing. They get overloaded and very often get "swaged"/seized to the gear. Push out and throw away.
That's what you get for trying to put 50hp through a 30hp gearbox.

Tap a thread inside the KS bushing.

I think it is the right size for 3/4-10 NC. The proper hole size would be 21/32". If that's not right, find the correct tap (ONO) for the hole in the bushing. Use a pipe union for a spacer, a heavy washer, a bolt, and pull it out.

Greg

Hi Guido
I also do the same as Greg suggests. Take an old course thread tap and tap into the old bushing. Heat the outside slightly then with a soft mallet with the tap held firmly in a vice, extract the old bushing. With the kick-start still warm place the new one in. If your vice is large enough (gape) then use that to reinstall the new bushing. You can use a large C clamp (G clamp for the Brits out there) and squeeze it home. Use a suitable socket to bring the bearing fully home below the pocket. The proper way is to use an arbour press with a machine shop attached. :mrgreen: But you can use what is available to you in a pinch. I normally place the new bearing into oil the night before.
Best of luck
CNN

I thought about the tap tip but wasn't sure. I got the other free moving bushings done but I think am having to send out the first gear and the sleeve gear to have them pressed in unless you you can tell me how to do it otherwise.
I would imagine they would have to be reamed to fit the shafts after being pressed in, no? If so, then it would be best for me to send them to Phil@ Fair Spairs.

Guido said:

I thought about the tap tip but wasn't sure. I got the other free moving bushings done but I think am having to send out the first gear and the sleeve gear to have them pressed in unless you you can tell me how to do it otherwise.
I would imagine they would have to be reamed to fit the shafts after being pressed in, no? If so, then it would be best for me to send them to Phil@ Fair Spairs.

Click to expand...

Yes.

I used a lather to bore out the KS bush, then cheated with first gear and machined up a bush, with under size internal, pressed the bush into the gear with the aid of a vice, then chucked up the whole gear, ensuring it was concentric and bored out the centre to fit the lay shaft. I made my own KS bush too, need to ensure the lenght is correct to set up end float. Oh and check out the KS bush in the outer cover, with so many bush joints, they all need to have good clearance to ensure the lays-haft is supported firmly.

Cheers Richard

Guido said:

....send out the first gear and the sleeve gear to have them pressed in unless you you can tell me how to do it otherwise.
I would imagine they would have to be reamed to fit the shafts after being pressed in, no? If so, then it would be best for me to send them to Phil@ Fair Spairs.

Click to expand...

Phil is a good guy, so I wouldn't hesitate to send it to him, but I have pressed the old bushings out using what ever would fit in the gear (probably a piece of pipe or conduit, maybe a 3/8 drive socket with a short extension) and a vice. Use the pipe union to recieve the spent bushings. When you are replacing the bushings, fill the sleeve gear with bushings. I forget how many fit, but it is something like 3 or 5. I did not have to ream the bushings after pressing them in.

Greg