kubota b6100 clutch replacement

[orangerust]

Well my clutch adventure continues. I decided to go genuine kubota disc and pressure plate.
Upon opening up the clutch I found a mess. The clutch disc had been poorly aligned which bent the drive shaft, made an oblong hole in the flywheel and even the end of the crankshaft. Ill replace the flywheel but the crank will have to stay as is.

 

[North Idaho Wolfman]

Well my clutch adventure continues. I decided to go genuine kubota disc and pressure plate.
Upon opening up the clutch I found a mess. The clutch disc had been poorly aligned which bent the drive shaft, made an oblong hole in the flywheel and even the end of the crankshaft. Ill replace the flywheel but the crank will have to stay as is.

You sure the flywheel is worn?
I don't thing I've ever seen that.
Pictures of the damage please.

 

[D2Cat]

Are you sure it's not your pilot bushing that has become oblong?

 

[orangerust]

Are you sure it's not your pilot bushing that has become oblong?

Attached.

Ive never seen anything like this either. What can be done here short of just replacing the whole flywheel? Fill the gap with JB weld?

 

[D2Cat]

Your picture isn't very clear, but it looks like the pilot bushing is still setting back in there. It looks like only the front end of the bushing is missing.

 

[orangerust]

Your picture isn't very clear, but it looks like the pilot bushing is still setting back in there. It looks like only the front end of the bushing is missing.

attaching clearer photos of flywheel and worn out bushing I removed.

 

[D2Cat]

Wow, the clutch wasn't poorly aligned really, it's held in place by the splines on the shaft and the location of the shaft in the hole, and the pressure plate. The tractor has been neglected for a long time, and it must have made an unbelievable noise when operating.

 

[Joe4]

I got some parts thru Amazon from White Horse Distribution in Canada.

 

[orangerust]

Wow, the clutch wasn't poorly aligned really, it's held in place by the splines on the shaft and the location of the shaft in the hole, and the pressure plate. The tractor has been neglected for a long time, and it must have made an unbelievable noise when operating.

Attaching photo of the pressure plate as it was. You can see the spline is off center. Bent propeller shaft? Anyway the question is what to do about it. I could replace the flywheel but if I could somehow just install the pilot bushing and JB weld the side gap would that work? Dont know how much side to side pressure is on that bushing. As its brass I dont expect too much pressure.

 

[North Idaho Wolfman]

WOW, that's a first, never seen one that bad.

Either a bent propeller shaft or a bad joint on the rear of the shaft or both.
Pull it out and see what you've got to deal with.
You can get the propeller shaft and joint for not too much $$.

Someones been in there before, the pilot bushing is not a stock bushing, it's over sized.

When I see anything this bad I wonder what someone did to make that happen.

The best fix for the engine would be to put a new crank in it but not very economical.
I don't thing JB weld will hold up to the force that's needed to keep the bushing intact.

If you drill out end of the crank to make it round again you could get an over sized bushing to fit the hole.

 

[D2Cat]

You might be able to take the flywheel to a machine shop and have them true up the center hole, then find a "thicker" pilot bushing. Around here I could get that done for about an hour of machine time. But then you'd feel better about it lasting.

JB Weld is an option, but you may be back at the same problem quickly with the same parts needing replaced.

 

[orangerust]

WOW, that's a first, never seen one that bad.

Either a bent propeller shaft or a bad joint on the rear of the shaft or both.
Pull it out and see what you've got to deal with.
You can get the propeller shaft and joint for not too much $$.

Someones been in there before, the pilot bushing is not a stock bushing, it's over sized.

When I see anything this bad I wonder what someone did to make that happen.

The best fix for the engine would be to put a new crank in it but not very economical.
I don't thing JB weld will hold up to the force that's needed to keep the bushing intact.

If you drill out end of the crank to make it round again you could get an over sized bushing to fit the hole.

I have no way to get 1/2 the tractor to a machinist. I assume that bushing hole must be absolutely in the middle of the crank. What a mess.
Can you tell me how the propeller shaft comes out? Do you take the joint off somehow then slide it out the front?

 

[orangerust]

You might be able to take the flywheel to a machine shop and have them true up the center hole, then find a "thicker" pilot bushing. Around here I could get that done for about an hour of machine time. But then you'd feel better about it lasting.

JB Weld is an option, but you may be back at the same problem quickly with the same parts needing replaced.

Need some educating here. The pilot bushing fits into the flywheel right?
The worn out bushing in the foto came from the crank end. Does the propeller shaft fit loosely into the end of the crank or is it a snug fit? I wonder if a new flywheel and pilot bushing would suffice? But then I wonder why the old owner put a bushing into the crank end...

 

[North Idaho Wolfman]

There is a roll pin on the back of the joint, you remove the the roll pin and all of it will come out the front.
I can give you a break down if you need it.

You can hand drill the back of the crank and get it close enough for it to work for you.

D2Cat is mistaken, you don't need to do anything with the flywheel, the pilot bearing fits into the crank not the flywheel.

 

[orangerust]

There is a roll pin on the back of the joint, you remove the the roll pin and all of it will come out the front.
I can give you a break down if you need it.

You can hand drill the back of the crank and get it close enough for it to work for you.

D2Cat is mistaken, you don't need to do anything with the flywheel, the pilot bearing fits into the crank not the flywheel.

How big a job is it to R&R the crankshaft? Does the whole engine have to come out?

 

[North Idaho Wolfman]

Just had a quick thought, you can rent a Magnetic drill that would work perfect for this kind of operation.
It would make it very easy to get a good centered hole in the crank.

Yea to change the crank is a really involved job, yes the engine would need to be pulled out, not impossible, but your going to get into the motor deep, at that point you might as well get into just doing a complete rebuild.

 

[North Idaho Wolfman]

Here is the shaft break down.

 

[D2Cat]

Orangerust, follow North Idaho Wolfman's direction with the crankshaft and flywheel advise. I fell off the turnip truck and hurt my head!

(One excuse is as good as another)

 

[orangerust]

Orangerust, follow North Idaho Wolfman's direction with the crankshaft and flywheel advise. I fell off the turnip truck and hurt my head!

(One excuse is as good as another)

must have been the same one I fell off of to buy this thing...

About drilling that hole in the end of the crank. Seems to me that it would have to be precisely drilled or when the flywheel turns its going to cause an occillationof the propeller shaft and Id be back where I am now. Not so?

 

[Russell King]

You may be able to have a machine shop make a drilling jig that will fit on the outer diameter of the crank shaft and has a precisely located center hole to drill through. There is some device that holds the drill bit so you’re sure it is straight and true location called a drill bushing

See https://en.m.wikipedia.org/wiki/Drill_bushing

You could hold it onto the shaft with the flywheel bolt pattern

Added link to bushing
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