964 crank-is this a std/std?

[adomakin]

just measured a 964 crank that I have, the mains are 59.98 and the big ends are 55.00 is this a std/std?

Thanks,

Andy

[Don Settergren]

Your crank seems stock and within the wear limit according to my Bentley Technical Manual. Page 13-4 says:

Main bearing journals 1-7
standard: 59.971-59.990mm
wear limit 59.960mm

Main bearing journal 8
standard: 30.980-30.993mm
wear limit 30.970

Connecting rod journals
standard: 54.971-54.990mm
wear limit 54.960mm

Smaller sizes in increments of .25 and .50mm indicate a modified grind.

[adomakin]

cheers don but it would look like my con rod journals are out of spec if they are 55.0 right?

Andy

[Don Settergren]

Hmmm, 55.0 is mighty close to spec. Wear would make them smaller than spec, thus requiring machining to an even smaller increment. Try measuring again after they are polished.

[IrocMan]

55.0 is less than 0.5 over the spec so I would say it's acceptable. I agree with Don.

[adomakin]

cheers cheers Don and Iroc. looks like its a standard crank then

thanks

Andy