Odd noise

[Tony Press]

What do the lower dynamic ratings mean in the application please Tony?

A lower capacity bearing will give a lower calculated nominal design life in revolutions to fatigue failure on a ring or rolling element.

It is used to design any bearing application.

The basic dynamic capacity is the constant load under which the bearing will attain a nominal life of 1 million revolutions.   This is only a nominal life-  some may fall below it and 50 % will last over 5 times longer.

I quote the figures to indicate why Austin designers would have chosen the Angular Contact Ball front and Roller Bearing rear  for the crankshaft - the alternate bearings suggested would lead to a lower bearing life but if this is acceptable then it is alright to substitute.

If you may remember the pinion support bearing went from a roller bearing to a ball bearing and subsequently back to a roller bearing- I would think because of the unacceptable reduced life of the ball bearing.  

Tony.