POWER UNIT 6-29
Piston ring end gap
Measure piston ring end gap with piston ring in the lowest posi-
tion of cylinder bore.
09900-20803: Thickness gauge
Standard: 1st & 2nd 0.10 – 0.25 mm (0.004 – 0.010 in)
Service limit: 1st & 2nd 0.50 mm (0.020 in)
If measurement exceeds service limit, replace piston ring.
Piston ring free end gap
Measure piston ring free end gap.
09900-20102: Vernier calipers
Standard: 1st Approx. 5.8 mm (0.23 in)
2nd Approx. 7.4 mm (0.29 in)
Service limit: 1st 4.6 mm (0.18 in)
2nd 5.9 mm (0.23 in)
If measurement exceeds service limit, replace piston ring.
Piston pin/Piston pin hole
Check for the followings:
• The piston pin and the piston pin hole are free from excessive
wear and damage.
• Apply engine oil on piston pin so that the piston pin can move
smoothly in the piston pin hole.
If improper condition is found, replace the piston pin and/or pis-
ton.
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)
If measurement exceeds service limit, replace the piston pin
and/or piston.
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
Piston pin outside diameter
Standard: 13.995 – 14.000 mm (0.5510 – 0.5512 in)
Service limit: 13.980 mm (0.5504 in)
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