[Paul_D]

Hello all,

I recently received my crankshaft back from a well-known, reputable Porsche-only machine shop. The crank was STD/STD and I originally sent it in for magnafluxing, cross-drilling, cleaning and polishing but the machinist felt that some scratches on one of the rod journals were deep enough to warrant re-grinding. After getting it back I measure all the rod journals at 2.242" +/- .0002" which is .001" under the low end of STD dimension specified in the Porsche manual. The mains are fine.

It's my understanding that a re-grind to first undersize would be .25mm or .0098"

Is there such a thing as .001" undersize rod bearings? With STD rod bearings my rod clearance will be too large, no?

I plan to call the machine shop Monday to clarify, but in the meantime I'm puzzled and wondering if anyone knows if .001" under rod journals are OK.

Thanks.

-Paul