Piston Inspection
- Measure the outer diameter of each piston at right angle 90° to the piston pin, 10.0 mm {0.40 in} above the bottom of the piston.
- If not within the specification, replace the piston, piston pin and snap ring as a single unit.
Standard piston outer diameter
88.965-88.995 mm {3.5026-3.5037 in}
- Measure the piston-to-cylinder clearance.
- If not within the specification, replace the piston, piston pin and snap ring as a single unit.
Standard clearance between piston and cylinder
0.025-0.045 mm {0.0010-0.0017 in}
Fig 1: Measuring Outer Diameter Of Each Piston At Right Angle 90° To Piston Pin, 10.0 mm (0.40 in) Above Bottom Of PistonMaximum clearance between piston and cylinder
0.11 mm {0.0043 in}
- Measure the piston ring-to-ring groove clearance around the entire circumference.
- If it exceeds the specification, replace the piston ring.
Standard clearance between piston ring and ring groove
Top: 0.04-0.08 mm {0.002-0.003 in}
Second: 0.03-0.07 mm {0.0012-0.0027 in}
Oil: 0.06-0.15 mm {0.003-0.005 in}
Maximum clearance between piston ring and ring groove
Top: 0.17 mm {0.0066 in}
Second, Oil: 0.15 mm {0.0059 in}
- Insert the piston ring into the cylinder by hand and use the piston to push it to the bottom of the ring travel.
- Measure each piston ring end gap with a feeler gauge.
- If it exceeds the specification, replace the piston ring.
Standard piston ring end gap
Top: 0.16-0.26 mm {0.0063-0.010 in}
Second: 0.31-0.46 mm {0.013-0.018 in}
Oil (rail): 0.15-0.40 mm {0.006-0.015 in}
Maximum piston ring end gap
1.0 mm {0.039 in}