Crankshaft Inspection - Yamaha EF1000 Service Manual

PISTON, CAMSHAFT, CRANKCASE, CRANKSHAFT
ENG
B
3-16
4. Measure:
•Piston ring end gap
Use a Thickness gauge.
Out of specification-+Replace.
NOTE: ________________________ __
You cannot measure end gap on expander
spacer of oil control ring. If control ring rails
show excessive gap, replace all three rings.
Piston ring end gap:
0.1-0.25 mm (0.004-0.01 in)
Piston ring end gap limit:
0.9 mm (0.0354 in)
5. Measure:
•Piston ring side clearance
Use a Thickness gauge.
Out of specification-+Replace.
NOTE: ________________________ ___
Clean carbon from piston ring grooves and
rings before measuring side clearance.
Piston ring side clearance
Top ring:
0.06 mm (0.0024 in)
2nd ring and oil ring:
0.04 mm (0.0016 in)
Piston ring side clearance limit:
0.15 mm (0.006 in)
CRANKSHAFT INSPECTION
1. Measure:
•Crankshaft runout
Use a Dial gauge.
Out of specification-+Replace.
Crankshaft runout limit:
0.02 mm (0.0008 in)