Scored crank on 919.165600 - how to dismount from motor

by Rick
(Dansville, NY)

Motor and Crank

Motor and Crank

Motor and Crank
Damaged parts

I have a Craftsman 919,165600 6.5hp upright oil-less compressor with a problem. After about 2 years and 60hrs. of operation it failed. Pulling it apart revealed the end bolt on the crank backed off resulting in destroyed big end bearings and spacers, which then resulted in a scored crank. I would like to refurbish or replace the crank but how in heck does it come off the motor shaft?


Any help appreciated.

Rick

Comments for Scored crank on 919.165600 - how to dismount from motor

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Jun 05, 2015
919.165600
by: jcvan1

I had my Air Compressor(Craftsman Pro.) Blow both Piston rods last week. I order new ones and installed them last night. The problem is that after tightening the end nut on the whole assembly, nothing will turn correctly. I found that the back piston rod goes around the bearing and is binding on the counter weight. any ideas? I thought there would be a spacer of some sort to keep it away from the weight. If you have any ideas email me at jcmolyn@gmail.com

May 11, 2015
Crank - Pictures
by: Bill

If you want to start a new thread and refer to this one, you can then upload photos which can be transferred to this post.

B.

May 11, 2015
The answer
by: Rick

Well, it wasn't what we thought but acted like it was a press fit worked. The motor shaft is not tapered but keyed and the crank actually fits into this. The eccentric locks the parts together, which the piston/bearing stack locks in place via the end shaft bolt. Easier to see in pictures.

May 05, 2015
"crank"
by: Doug in s.d.ca

Yes, I did notice, but that's the way it goes sometimes.

You might be able to remove the armature and get more room.

May 05, 2015
Press fit
by: Anonymous

If you notice in the photo, the fit between the crank and case is very close. Unsure if I can get an support in that small gap. May have to try a wedge but bearing may take a beating.

May 04, 2015
"crank"
by: Doug in s.d.ca

A taper press fit. Try supporting the counterbalance between the motor and the balance/crank, and whack the motor shaft with a mallet. It should pop off. Might take a few trys...

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Scored crank - how to dismount from motor - the answer

by Rick
(Dansville, NY)

Motor Shaft

Motor Shaft

Motor Shaft
Ecentric and Shaft
Parts Loosesly Assembled

See the original post.
The motor shaft is not tapered. The eccentric, flyweights and the whole mess are held on by the crank pin being wedged into a notch in the motor shaft.

Hopefully these pictures will help the next person.

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May 12, 2015
scored
by: Doug in s.d.ca

Super.

So it's press fit, just no taper?

sorry for misdirection, and thanks for the update.

May 12, 2015
Scored crank
by: Bill

Very good of you to take the time to help others. Thank you.

Bill

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