OIL LEEK

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Karl and Gregg,
We'll I think Martyn and you are right. I've just driven 40 miles in 1 hour and used nearly one and a half UK pints, and it is almost certainly coming out of the rear main bearing.
You say the main should have a tolerance of only 0.0005'', whereas the big ends should be 0.002''  (from an email late last year) or have I misunderstood what these tolerances actually mean

Is the tolerance of the mains at 0.0005 the total, or 1/2 the total? Likewise is the total tolerance of the big ends 0.002'' or 0.004''? (I would have thought would have a total of 0.002'')

Assuming the mains should have a total of 0.001, and assuming that when I took my reading their was no distortion of the crank because of its weight and the weight of the flywheel and clutch, my reading of 0.0025'' would equal a total of 0.005''. So if I take out 0.002'' of shims either side, I will in effect only cure the bottom half of the bearing. If I take 0.004'' out of the shims, the bearing cup would be trying to force the crankshaft up out of line.

So I suppose I am asking what figures should I use; is it practical to try and fix these tolerances of mine in this way, or heaven forbid, is it a case of new white metal and in-line boring and all that that entails?

My mechanics manual gives no info on this subject at all, is there a proper workshop manual and if so how do I get one?

Hope you're not getting bored by all this,  Robert