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Another con rod question #730934
04/05/18 8:54 am
04/05/18 8:54 am
Joined: Jan 2008
Posts: 46
New Zealand
F
Flyingfish Offline OP
BritBike Forum member
Flyingfish  Offline OP
BritBike Forum member
F
Joined: Jan 2008
Posts: 46
New Zealand
Hi all,

I think this might be an easy question - possibly one of the many things I once knew but have now forgotten. When you bolt the con rod together (1953 A10) should the lower part of the rod be aligned so that the indents that stop the bush from moving are on the same side of the rod (i.e. both on the left or right), or should they be on opposite sides. Or does it not matter?

Rick


T100R (1973)
TR6 (1967)
BSA A10 (1953)
BSA C15 (1963)
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Re: Another con rod question [Re: Flyingfish] #730935
04/05/18 9:22 am
04/05/18 9:22 am
Joined: Aug 2014
Posts: 1,657
OZ
Triless Online content
BritBike Forum member
Triless  Online Content
BritBike Forum member
Joined: Aug 2014
Posts: 1,657
OZ
Regardless of make or model, I was taught that the locaters are always on the same side ! Another thing, the real reasoning lost in the mist of time, the locaters faced the front, or direction of travel, so that the thrust didn't flatten the the tabs and cause bearing inserts to rotate in high load situations ! Don't shoot the messenger, please !

Re: Another con rod question [Re: Flyingfish] #730939
04/05/18 11:49 am
04/05/18 11:49 am
Joined: Dec 2004
Posts: 9,483
Scotland
kommando Online content
BritBike Forum member
kommando  Online Content
BritBike Forum member
Joined: Dec 2004
Posts: 9,483
Scotland
The tabs do not stop the bearings from rotating, its the 'crush' caused by the bearing being slightly longer than the housing so being forced to press against the ID of the big end in the rod that stops them rotating. The purpose of the tabs is for orientation of the bearing so the oil holes line up and the bearing is not too far over either side. The tabs need to be orientated to match the assembly the rod was machined in so the bore is correct, there are usually identification marks on the side of the rod but if none then look carefully at the machining marks for clues.


Moderated by  Allan Gill, Jon W. Whitley 


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