6-26 POWER UNIT
Piston ring free end gap
Measure the piston ring free end gap.
09900-20101: Vernier calipers
Piston ring free end gap:
Standard:
1st Approx. 6.1 mm (0.24 in)
2nd Approx. 5.7 mm (0.22 in)
Service limit:
1st 4.9 mm (0.19 in)
2nd 4.6 mm (0.18 in)
If the measurement exceeds the service limits, replace the pis-
ton ring.
PISTON PIN / CONROD / CRANKSHAFT
Piston pin clearance
To check the clearance, measure the following items.
• Piston pin outside diameter in the thrust and axial directions.
• Piston pin hole diameter in the thrust and axial directions.
09900-20205: Micrometer
09900-20605: Dial calipers
Pin clearance in piston pin hole:
Standard: 0.002 – 0.013 mm (0.0001 – 0.0005 in)
Service limit: 0.040 mm (0.0016 in)
Pin clearance in conrod small end:
Standard: 0.006 – 0.019 mm (0.0002 – 0.0007 in)
Service limit: 0.050 mm (0.0020 in)
If the clearance exceeds the service limit, replace the piston, the
piston pin and/or the conrod assembly.
Piston pin outside diameter:
Standard: 11.995 – 12.000 mm (0.4722 – 0.4724 in)
Service limit: 11.980 mm (0.4717 in)
Piston pin hole diameter:
Standard: 12.002 – 12.008 mm (0.4725 – 0.4728 in)
Service limit: 12.030 mm (0.4736 in)
Conrod small end inside diameter:
Standard: 12.006 – 12.014 mm (0.4727 – 0.4730 in)
Service limit: 12.040 mm (0.4740 in)
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