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Inter main bearing fit on shaft??

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Inter main bearing fit on shaft??

Posted by Michael Rettie at November 18. 2017

I'm rebuilding my '47 Inter motor after the previous owner's aborted try and am running into a problem with the drive side main bearing fit on the mainshaft. Both bearings are new. The outer ball bearing is a nice fit on the shaft requiring a solid push. The inner roller race, however, is loose enough to drop right on, a pretty sloppy fit to me. The ball bearing is good old RHP and the roller FBC RLS 11. Any thoughts?

Re: Inter main bearing fit on shaft??

Posted by David Cooper at November 19. 2017

Not an expert...I hope one will come along shortly... But Loctite bearing fit would probably sort it. It should come back off with a bit of gentle heat when the time comes.

Re: Inter main bearing fit on shaft??

Posted by arne_eftestol at November 19. 2017

Michael

I had the same problem on my -53 engine except that all three bearings

was a sloppy fit. I had the shafts hard chromed and reground, That was

25000 miles ago and no indications of failure yet.

If you do this, you need to make sure that your centres are ok because obviously they are needed for the grinding operation.

Mine were not, and I had a lot of problems getting them corrected !

Loctite might work, but I must say I am very doubtful...

Regards

Arne

Re: Inter main bearing fit on shaft??

Posted by Michael Rettie at November 19. 2017

I'm very skeptical of Loctite in this situation. I suspect it would disintegrate in no time with the pounding of the engine. Perhaps elsewhere where it only encountered rotation and less heat but probably not here. Read George Cohen's notes and you'll find his opinion.

https://drive.google.com/file/d/0B_5ev0g65Xk6cnNzTlFsTzVUWGM/view?usp=sharing

Building up the shaft is a possibility but with one bearing a good fit and the other not so, I'm going to try to find a proper RHP bearing. I'm suspicious of the FBC being not made to spec. Not really sure of its origin.

Everyone should have a read of George's notes, Inter owner or not.

Thanks all.

Mike

Re: Inter main bearing fit on shaft??

Posted by jonathan_newton at November 20. 2017

Previously Michael Rettie wrote:

I'm very skeptical of Loctite in this situation. I suspect it would disintegrate in no time with the pounding of the engine. Perhaps elsewhere where it only encountered rotation and less heat but probably not here. Read George Cohen's notes and you'll find his opinion.

https://drive.google.com/file/d/0B_5ev0g65Xk6cnNzTlFsTzVUWGM/view?usp=sharing

Building up the shaft is a possibility but with one bearing a good fit and the other not so, I'm going to try to find a proper RHP bearing. I'm suspicious of the FBC being not made to spec. Not really sure of its origin.

Everyone should have a read of George's notes, Inter owner or not.

 

Thanks all

Mike

 

Hey Mike, im sure you have instruments to measure the internal of the bearings  but if not carefully fill the centre of the one thought to be oversize with plastacine,  putty, or similar. Dress it nicely and remove carefully then sit the other bearing onto it. If it forms a ridge you know there is a problem with the bearing. A little  lube may be required to aid removal.  I'm with you on Loctite in this application, don't think its a practical solution.  Georges notes are like my bible!

 

Cheers

Jon

 

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