Super Jet Superjet crank question

[smoofers]

I just put together a buddy's motor and it is failing a pressure test. It looks like the motor is leaking between the crank shaft and the collar that slips over it (rear of the crank, the seal lips ride on the collar).

Is there anything I can do? Any compounds I can put on the shaft before I put the collar on?

Before assembling the motor I noticed the collar fit on fairly tight but I was still able to remove/install it by hand....

Would love some input, thanks in advance.

 

[smoofers]

It is the rear crank seal race that I am talking about. Looks like pressure is leaking out between the race and the crankshaft.

I'm sure that that shaft clamps down tight once the motor is up to temp, but the fact that it is not passing a pressure test upsets me.

I'm just wondering if anything like epoxy or silicone could be applied between the race and shaft to take up the extra thousandth or so of clearance without melting out or causing more problems?

 

[QJS]

If it's a new OEM crank you can buy that part separately , try fitting a new one with some retaining compound underneath it. You normally need to heat them up a little to get them on.
Chris

 

[smoofers]

Update:

New collar was ordered. When it arrived, I threw it in the oven at 400F for a few minutes, gave it a quick lick with the benzo torch, then (while wearing welding gloves) it slid right on.

Motor now drops less than 1/2psi (@8psi) in 10 minutes! Success!

 

[JetManiac]

Update:

New collar was ordered. When it arrived, I threw it in the oven at 400F for a few minutes, gave it a quick lick with the benzo torch, then (while wearing welding gloves) it slid right on.

Motor now drops less than 1/2psi (@8psi) in 10 minutes! Success!

Awesome!

I wonder if simply putting a little wicking loctite without removing would have worked also.

 

[smoofers]

I fought with that question before we went with the new collar. The old collar was worn enough to where it would spin on the crank. Kinda making me think that is what actually caused the motor to blow...

So instead of trying any sort of fix the new collar was the best solution. It only cost like $15 bucks. Hardest part was the 3 weeks it took to arrive from an OEM parts supplier.