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SailorTom

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  1. For those interested... I took a punt and bought all the bearing shells at standard size. They seems to fit snugly, so it looks like my crankshaft was never reground. So now I know what isn't in the workshop manual. Standard size of the bearing journals is 2.00" for big ends and mains.
  2. Richard, That is the same as the manual that I have (on paper). I expected the spec to be in there too, but couldn't find it. I would appreciate it if you could let me know what your measurements are. Tom
  3. I am trying to find the original diameter of the bearings on my crankshaft. I am re-building a Thornycroft 90 engine, based on a 1.5 BMC. The pistons are stamped with oversize marks and the bores measure at 0.020" oversize, so I know that the engine has been reconditioned in the past. But were the crankshaft bearings ground at the same time? (I have the specification for the standard bore, but not the crankshaft bearings) I measure the journal diameters for the main and big end bearings all at exactly 2" / 50.8mm. The round number of 2 inches makes me think that is probably the standard size, but I am not sure. I have the part numbers from the old shells, but I can't find any cross-reference for them. Does anyone know the standard diameters for these bearings? Thanks for any help Tom
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