I want to Plastigage my main and con rod bearings. Bentley gives .001 -
.0027 as the range for con rods. For the mains, I can't find any trustworthy
information in Haynes or Bentley. There is no clearance spec that I can find
and the dimensional data looks suspect:
Haynes Bentley
Journal Dia(in) 2.311 - 2.3115 2.3110 - 2.3315
Bearing ID (in) 2.002 - 2.0025 can't find
Journal Dia(mm) 58.699 - 58.712 58.694 - 58.7121
Bearing ID (mm) 50.85 - 50.86 can't find
This is disturbing!
Bentley gives a range of .0205" for journal diameter. Probably a misprint,
since the metric dimensions are close to Haynes. So, let's assume Haynes'
2.311 - 2.3115 journal diameter is correct.
Now to calculate acceptable clearance I would compare the bearing ID
tolerance to the journal diameter tolerance. Well, the bearing ID is about
.300" less than the journal. I'd have a bit of trouble fitting the crank in
here wouldn't I?
Can anybody help me sort this out? I'm really just looking for the clearance
number for the mains.
Thanks,
Hugh Fader
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