5-34 ENGINE TOP END
Cylinder and Piston
Piston Ring Groove Width Inspection
Measure the groove width at several points around the
piston with a vernier caliper.
Piston Ring Groove Width
If any of the groove widths exceeds the service limit, re-
place the piston.
Piston Ring Thickness Inspection
Measure the thickness at several points around ring with
Piston Ring Thickness
If any of the measurements is less than the service limit
on either of the rings, replace the rings as a set.
When using new rings in a used piston, check for un-
even groove wear. The rings should fit perfectly parallel
to the groove sides. If not, replace the piston.
Piston Ring End Gap Measurement
Place the piston ring [A] inside the cylinder, using the pis-
ton to locate the ring squarely in place. Place the piston
ring close to the bottom of the cylinder, where cylinder
wear is minimal
Measure the gap [B] between the ends of the ring using
a thickness gauge.
If the ring end gap exceeds the service limit, replace the
Piston Ring End Gap
1.03 ∼ 1.05 mm (0.0406 ∼ 0.0413 in.)
1.13 mm (0.0445 in.)
0.970 ∼ 0.990 mm (0.0382 ∼ 0.0390 in.)
0.90 mm (0.035 in.)
0.25 ∼ 0.35 mm (0.0098 ∼ 0.014 in.)
0.15 ∼ 0.50 mm (0.0059 ∼ 0.020 in.)
0.6 mm (0.02 in.)
0.8 mm (0.03 in.)