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750s3 cam bearing repair

warrenwal

Just got it firing!
Joined
Feb 7, 2014
Messages
6
Hi All.....just seeking some advice re a pitted cam bearing on my 750s3. The large front bearing in the crankcase has some pitting, the cam is fine. I would like to hear from anyone who has faced this issue and how it was repaired. Being an s3 , ditching the case for a good used one is out of the question so repaired it must be. Any input appreciated. Cheers
 
a picture paints a thousand words.......
if it was pitting over the whole diameter allowing the shaft extra movement you could resleeve it, if it was just one pit and the rest was in good order(not worn) I would say leave it , it will act as an oil reservoir.

Have I done this for an S3 ..no
I work in a jet engine overhaul workshop and part of my remit is to repair the magnesium gearbox....resleeve worn bearing diameters, undercarrige wheel bearing dias. etc etc so I have an engineers view of your problem.

Your problem will come deciding what grade aluminium to make the sleeve from and how to pin it to prevent rotation
 
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Cheers matey.... appreciate your input. The pitting is in just one area about 2mm square.....the rest of the bearing face is fine. It kind of looks like tiny pieces have come away from the bearing surface as opposed to say a foreign object impacting the bearing surface From your experience what do you think might be the cause. There was a lot of sludge in the sump.
Again, thanks for the reply.
Warren
 
Hi warren
I would say from the way you describe it you will have no problems, could have been a gas or metal shrinkage cavity(cast aluminium can suffer from these faults) from manufacture which only showed up once they machined the bore.
If the pieces had come away whilst running they would have left score marks leading away from the original departure point.
Sludge in the sump would have come from poor oil maintenance regime. Metal grindings would be more of a worry ...
I recon you are good to go
Cheers
AndyP
 
Thanks Andy, I appreciate your knowledge..... no sign of scoring around the edge of the pits so sounds like you are on the money. Thanks again. Cheers, Warren
 
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