Quote:
Originally Posted by Billybob
Not trying to nitpick, but this statement deserves some comment.
Ah! a reread makes me think that you may have meant "before you take the block off to the machine shop for a "Piston Cylinder" re-bore! If so please discount the first two paragraphs!
Plasti-Gauge would as you are later seen doing, is used to ascertain the tolerance between the bearing shell and the crankshaft. This measurement will have nothing to do with the engine block's crank shaft bearing bore. Without some noticeable bearing failure the block bore would remain unaltered and would not need a "re-bore".
If there where a question regarding the block's bore the way to ascertain it's condition would be direct measurement of multiple quadrants and for square and between all the bores for alignment. Fortunately MB lower ends are exceedingly robust and absent a bearing shell being spun out and physically damaging the block bore I have never heard of a 615/6/7 block bore being tweaked!
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Indeed I'm just doing a quick check to help me assess what work needs to be done before I take it to the machine shop. I'll be doing this check too when I'm rebuilding the engine to make sure the clearance is good with new shell bearings (it should be but I think it is worth a check)
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