6A–88 ENGINE MECHANICAL
Piston Ring Expansion Force
Use an expansion force gauge to measure the piston
ring expansion force.
Piston ring expansion force
1st ring:
Standard: 22.7 – 30.7 N
(2.31 – 3.13 kg/5.09 – 6.90 lb)
Limit: 12 N (1.2 kg/2.6 lb)
2nd ring:
Standard: 16.7 – 22.6 N
(1.70 –2.30 kg/3.74 – 5.07 lb)
Limit: 5.9 N (0.6 kg/1.3 lb)
3rd ring:
Standard: 20.8 – 28.2 N
(2.12 – 2.08 kg/4.67 – 4.59 lb)
Limit: 4.9 N (0.5 kg/1.1 lb)
Oil ring:
Standard: 43.0 – 58.1 N
(4.38 – 5.92 kg/9.66 – 13.0 lb)
Limit: 41 N (4.2 kg/9.3 lb)
Piston Pin Diameter
Use a micrometer to measure the piston pin outside
diameter at several points
If the measured value is less than the specified limit, the
piston pin must be replaced.
Piston pin diameter
Standard: 35.995 – 36.000 mm (1.4171 – 1.4173 in.)
Limit: 35.95 mm (1.4154 in.)
Piston Pin Hole and Piston Pin Clearance
Use a inside dial indicator to measure the piston pin hole
(in the piston).
Piston pin hole and piston pin clearance
Standard: 0.004 – 0.017 mm (0.0003 – 0.0008 in.)
Piston Pin and Connecting Rod Small End
Bushing Clearance
Use a caliper and dial indicator to measure the
clearance between the piston pin and connecting rod
small end bushing
If the clearance between the piston pin and the
connecting rod small end bushing exceeds the specified
limit, replace the piston pin and/or the connecting rod
assembly.
Small end bushing clearance
Standard: 0.012 – 0.027 mm (0.00047 – 0.0011 in.)
Limit: 0.05 mm (0.0020 in.)
015HY00030
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