Piston Ring Clearance Inspection

PISTON RING CLEARANCE INSPECTION





1. Measure the piston ring-to-ring land clearance around the entire circumference. If the piston ring-to-ring land clearance is not as specified, replace the piston and piston ring.
Standard clearance
Top: 0.030 - 0.065 mm (0.0012 - 0.0025 inch)
Second: 0.030 - 0.070 mm (0.0012 - 0.0027 inch)
Oil rail: 0.07 - 0.16 mm (0.0027 - 0.0062 inch)
Maximum clearance
Top, second: 0.15 mm (0.0059 inch)
Oil rail: 0.20 mm (0.0078 inch)
2. Insert the piston ring into the cylinder by hand and use the piston to push it to the bottom of the ring travel.





3. Measure each piston ring end gap using a feeler gauge. If the piston ring end gap is not as specified, replace the piston ring.
Standard end gap
Top: 0.15 - 0.30 mm (0.0059 - 0.0118 inch)
Second: 0.30 - 0.45 mm (0.0119 - 0.0177 inch)
Oil rail: 0.2 - 0.70 mm (0.0088 - 0.0275 inch)
Maximum end gap 1.0 mm (0.039 inch)