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• piston:
- There must not be any signs of seizure or deep cracks.
- Check the wear by measuring the piston at 18.5mm from the bottom keeping
the measuring instrument at right angles to the axis pin.
Height limits:
SELECTION A: 66.290mm
SELECTION B: 66.300mm
SELECTION C: 66.310mm
SELECTION D: 66.320mm
• The pin must not be blue because that indicates a high working temperature and
the external diameter must not be less than 15.990mm.
• Measure the slack between the piston ring and its seat: slack height limit 0.8mm.
• 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: 0.5mm
• 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
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