Fan sheave scraping the motor

dauphin80 · Post by **dauphin80** » Mon Apr 18, 2011 11:32 am

Guys, I am tearing apart my Mark V. When I first gave it a test run, it made a scraping noise. It looks like the fan sheave is making contact with the motor plate. Any thoughts on what to do while it is completely apart?

JPG · Post by **JPG** » Mon Apr 18, 2011 11:48 am

dauphin80 wrote:Guys, I am tearing apart my Mark V. When I first gave it a test run, it made a scraping noise. It looks like the fan sheave is making contact with the motor plate. Any thoughts on what to do while it is completely apart?

There is a spacer(bushing) between the fan sheave and the motor. It is notorious for being too thin and embedding into(I think the sheave). Either a thin washer over the 'groove' or replace it with a thicker sleeve(or both).

Make sure the end cap is attached to the motor case properly.

ddvann79 · Post by **ddvann79** » Mon Apr 18, 2011 11:59 am

I think JPG is right on with the bushing or spacer but in the mean time, you could simply pry the sheave away from the end plate of the motor and tighten the set screw as soon as you get clearance.

Is it possible that the shaft is seated too far into the motor?

dauphin80 · Post by **dauphin80** » Mon Apr 18, 2011 4:45 pm

I tried to pry the fan sheave, but it was pretty tight. Where is the set screws for the fan sheave?

jcraigie · Post by **jcraigie** » Mon Apr 18, 2011 7:12 pm

Look down thru the air intake on the motor houseing and you will see the setscrew down in there.

JPG · Post by **JPG** » Mon Apr 18, 2011 8:02 pm

jcraigie wrote:Look down thru the air intake on the motor houseing and you will see the setscrew down in there.

That is an 'exhaust port'!;):)

P.S. If ya be prying, do so against the center hub, not the outer edge.

jcraigie · Post by **jcraigie** » Mon Apr 18, 2011 8:20 pm

[quote="JPG40504"]That is an 'exhaust port'!]

Um, yeah what he said:o

dauphin80 · Post by **dauphin80** » Mon Apr 18, 2011 9:16 pm

I will give it a try later as I ran out of day. Thanks for the info.

jcraigie · Post by **jcraigie** » Mon Apr 18, 2011 9:49 pm

Go easy on the prying so you don't bend/break anything. I found that with the motor securely held to the bench pulling and wiggling on the sheave it came right off. prying just seemed to cock it to one side or the other and bind it.

JPG · Post by **JPG** » Tue Apr 19, 2011 12:58 am

jcraigie wrote:Go easy on the prying so you don't bend/break anything. I found that with the motor securely held to the bench pulling and wiggling on the sheave it came right off. prying just seemed to cock it to one side or the other and bind it.

Which is why one should not pry out at the edge, but rather near the shaft.