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Machine Shop and Tool Talk

Wiper motor attach top collar to shaft?


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  #1  
Old 07-26-2017, 09:30:34 AM
sdowney717 sdowney717 is offline
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Default Wiper motor attach top collar to shaft?

This collar holds the wiper arm.
The arm has a set screw.

I took this apart as it stuck with rust, it works fine now.
I tried JB weld, but it failed.

Originally swedged and riveted, but now needs some other solution.
The area is maybe 3/16 - 1/4 inch where top collar interfaces onto the shaft.
The other angled collar is like a top bearing support.
I thought of pinning this with a roll pin.
Other idea is a tapped hole and set screw.
I cant really weld it, cause would destroy the grease.




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Old 07-26-2017, 09:55:04 AM
J.B. Castagnos J.B. Castagnos is offline
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Default Re: Wiper motor attach top collar to shaft?

If you don't get a press fit it will be a temporary repair. You should be able to remove the shaft, weld or braze it, turn it down, ream the collar for a light press fit, then drill and install a roll pin.
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Old 07-26-2017, 04:49:21 PM
sdowney717 sdowney717 is offline
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Default Re: Wiper motor attach top collar to shaft?

Quote:
Originally Posted by J.B. Castagnos View Post
If you don't get a press fit it will be a temporary repair. You should be able to remove the shaft, weld or braze it, turn it down, ream the collar for a light press fit, then drill and install a roll pin.
Right now it is a loose sliding fit with play, so what your saying is even pinned that will wear and break?
Yes the shaft comes out from its bearing.

The other thought was this. If the lower crank is a rectangular fit onto a slotted shaft then peened- riveted into place.

What could be done is silver braze the top collar to a shaft, then where the crank fits, grind 2 edges flat, drill a hole tap and put in a screw to hold the crank to shaft. Would they have used a hardened steel shaft for a wiper motor?

The shaft is 5/16 (I think) and was machined down on the collar end.

My other thought, drill a hole thru the long threaded brass bearing for a grease port.
Clean all the grease out.
reassemble shaft into long threaded bearing.
Silver braze the collar.
Then using the drilled hole pump in grease again.
The hole could be in the part where it sits in the pot metal housing.
Perhaps use a thick gear oil, heat it in a pan of hot gear oil to let it soak in.
That might be the easiest repair.
the long brass threaded bearing can be unscrewed from the pot metal motor housing.
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Old 07-27-2017, 09:48:34 AM
beezerbill beezerbill is offline
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Default Re: Wiper motor attach top collar to shaft?

Yes, silver solder might be your best bet, as long as there are no plastic bushings in there. Be quick with the torch so that you don't get everything too hot. Having a little hole to pump grease in afterwords is also a good idea - use one of the little conical needle grease tips on your grease gun. You can even have a little cover screw for the hole. And you can re-grease it periodically.
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