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