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SELECTION A: 69.564mm
SELECTION B: 69.574mm
SELECTION C: 69.584mm
SELECTION D: 69.594mm
• The pin must not be blue because that indicates a high working temperature and
the external diameter must not be less than 17.990mm.
• Measure the slack between the piston ring and its seat: slack height limit 0.1mm.
• Piston ring: insert a piston ring in the cylinder one by one, by using the piston, so
it is a square, measure the gap that is created between the two ends of piston ring
using feeler gauge. Height limit: 0.7mm
• Crankshaft: supporting the crankshaft at the two working points of oil seals, with
two comparators, measure the centering at the two working points of the bearings,
marked on diagram 2 with the letter A. Height limit: 0.05mm
• Measure the bearing seating, which must not be lower than the height limit:
24.98mm
• Check with a feeler gauge that the axle slack of the connecting-rod between the
two semi shaft, which must not exceed the height limit: 0.7mm
• Check the radial slack of the connecting rod on the coupling axle which must not
exceed the height limit: 0.05mm. This is detected by placing a comparator (B), as
shown in diagram 2, and moving the connecting rod vertically. The slack shown by
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