Hello miniforum friends,
I finally was able to get hold of a 12G82 crank to start my 1098 project (though the number on the crank is 12g82A, which i suspect means factory cross drilled, since this is a cross drilled crank).
Now taking the measurements, its pretty obvious that the crank will need oversied bearings. Im not very confident in my ability to use a micrometer accurately, but here are the measurements I got of the various journals:
Main Journals:
Closest to flywheel: 43.94mm
Middle: 43.94mm
timing pulley side: 43.95mm
Big Ends:
No 1: 40.71mm
No 2: 40.67mm
No 3: 40.70mm
No 4: 40.65mm
From the Haynes manual: for 85H,95H and 10H
Main bearing journal diameter: 44.46 - 44.47mm
Minimum main bearing journal regrind diameter: 43.45mm
Big end journal diameter: 41.28 - 41.29mm
Minimum big end journal regrind diameter: 40.27mm
The machine shop says I need +30 for the mains and +40 for the big ends. Is this true? how do I validate this?
