Piston Ring: Service and Repair
PISTONSPiston Measurements:
The piston and cylinder wall must be clean and dry. Piston diameter should be measured 90 degrees to piston pin at size location shown in image.
Checking Cylinder Bore Size:
Cylinder bores should be measured halfway down the cylinder bore and transverse to the engine crankshaft center line shown in image.
Refer to Cylinder Bore and Piston Specification Chart. Pistons and cylinder bores should be measured at normal room temperature, 70°F (21°C).
RINGS
Check Gap On Piston Rings:
1. Wipe cylinder bore clean. Insert ring and push down with piston to ensure it is square in bore. The ring gap measurement must be made with the ring positioning at least 12 mm (0.50 inch) from bottom of cylinder bore. Check gap with feeler gauge. Refer to Piston Ring Specification Chart.
2. Check piston ring to groove clearance: Refer to Piston Ring Specification Chart.
Piston Ring Specification Chart:
Piston Ring Specification Chart