In a previous thread about Dommie cylinder lubrication, one reply mentioned the possibility of the crankshaft not being parallel to the crankcase mouth joint face. Apparently it's a common problem and may be up to 15 thou in bad cases.
My engine shows a misalignment of 15 thou, and I wondered if this might be a possible cause of its tendency to seize the left piston, (though why only the left I can't imagine).
It occurred to me that slightly different length conrods could also be a cause of this misalignment so I swapped left for right. This halved the measurement to 8 thou, so it seems the fault is a combination of conrods and crankshaft/case alignment. This works out as a tilt to the left of 0.0612?.
My question is: is this within acceptable tolerances, or should I try and have the crankcase mouth milled down to level things up? I have a spare 40 thou thick steel compression plate lying around. Would it be possible to mill this to make a sloping spacer?
Attachments Copy%20of%20IMGP6942.1.jpgWith modern oil and regula…
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With modern oil and regular changes the crank should last for your lifetime, my 1960 crank is still standard. But pretty worn!.