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#312175 - 05/08/10 1:57 am A65 Big rod eyes  
Joined: Aug 2001
Posts: 62
Beeza Geeza OZ Offline
BritBike Forum member
Beeza Geeza OZ  Offline
BritBike Forum member

Joined: Aug 2001
Posts: 62
Australia
Hi all,
I am finally putting my A65s back together, after yrs of Triton building. Desperately need specs on conrod big end eye sizes, as they are a in need of resizing. I have mic'd them up and have a rough of 1.844". Can anyone confirm this, or give me the correct size, please?? Any help greatly appreciated.

Cheers, Geeza


'ead down, arse up, flat out!
Geeza.
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#312373 - 05/09/10 1:17 pm Re: A65 Big rod eyes [Re: Beeza Geeza OZ]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

BritBike Forum member

Joined: Sep 2002
Posts: 7,812
Seattle
Geeza,

There is no spec given in the factory literature. My personal conclusion from this is that, it is only indirectly consequential and really only secondary to the really critical measurements. I tend to depend on big end diameter with bearings installed and ovality of the rod eye. Ovality of more than .0010" means the big end has stretched, the material has yielded and the rod is likely due to fatigue and fail. I would throw such a rod away. For diametriacal clearance, I install a bearing set and torque the rod bolts. The bearing should measure no more than .002" bigger than the rod journal. If requiring a regrind, I spec a clearance of .0015".

Hope that helps even if it doesn't directly answer your question.


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#312384 - 05/09/10 2:15 pm Re: A65 Big rod eyes [Re: Alex]  
Joined: Aug 2001
Posts: 3,871
Mr Mike Offline
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Mr Mike  Offline
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Joined: Aug 2001
Posts: 3,871
Cape Carteret, NC
I suspected ovality on one of my rods, but do not have the tools to measure accutately. When I installed the bearings I checked for clearance with plastic gauge for .0015". I noticed however that one rod had an ever so perceptible tight spot when rotated whereas the other rod spun like it was supposed to. I took the crank, rod and bearings to my machinist who felt the rod and resized with a hone setup for that purpose. I reassembled the rod with him present and it felt perfect and only cost $25. Been running fine ever since.

Mr Mike


Moderated by  Allan Gill, Jon W. Whitley 


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