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... J ] ] J : THE ENGINE All major parts of the Aston Martin engine and suspension are brought in as castings, machined to the limits required, crack tested when necessary, and searchingly inspected before being passed for fitting. Valve seats are ground in by hand and finished with engineer's blue. The main bearing bore is finished to a tolerance of 6/10,000ths of an inch. Con rods are carefully selected and weighed to make up a perfectly matched set of six, which once selected, remain together. If at any time, for any reason, a replacement is Checking the bore line on a Solex air gauge. The gauge is passed through each main bearing, with bearing shells tightened to 55 lbs. in place. The clearance in each is recorded. Permissable tolerances must lie between .001 25 and .001 75. This allows the crankshaft a running clearance of .0005 or { of one thousandth of an inch. I ...
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