ENGINE 3-37
PISTON RING TO GROOVE CLEARANCE
• Measure the side clearances of the 1st and 2nd piston rings
using the thickness gauge.
• If any of the clearances exceed the limit, replace both the pis-
ton and piston rings.
[ 09900-20803: Thickness gauge
09900-20205: Micrometer (0 – 25 mm)
Piston ring to groove clearance:
Service Limit (1st): 0.18 mm (0.0071 in)
(2nd): 0.15 mm (0.0059 in)
Piston ring groove width:
Standard (1st): 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(2nd): 1.01 – 1.03 mm (0.0398 – 0.0406 in)
(Oil): 2.01 – 2.03 mm (0.0791 – 0.0799 in)
Piston ring thickness:
Standard (1st): 0.970 – 0.990 mm (0.03819 – 0.03898 in)
(2nd): 0.970 – 0.990 mm (0.03819 – 0.03898 in)
PISTON RING FREE END GAP AND PISTON RING END GAP
• Measure the piston ring free end gap using vernier calipers.
• Next, fit the piston ring squarely into the cylinder and measure
the piston ring end gap using the thickness gauge.
• If any of the measurements exceed the service limit, replace
the piston ring with a new one.
[ 09900-20102: Vernier calipers
Piston ring free end gap:
Service Limit (1st): 9.3 mm (0.36 in)
(2nd): 6.9 mm (0.27 in)
[ 09900-20803: Thickness gauge
Piston ring end gap:
Service Limit (1st): 0.50 mm (0.020 in)
(2nd): 0.50 mm (0.020 in)
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