Piston Ring: Testing and Inspection

Piston Rings, Cylinder Bore and Piston Installed Position

Piston Ring Gap, Checking





Special tools, testers and auxiliary items required

• Feeler Gauge

Test Sequence:

- Push the piston ring squarely from above, down to approximately 15 mm from the bottom end of the cylinder.






Piston Ring Groove Clearance, Checking





Special tools, testers and auxiliary items required

• Feeler Gauge

Test Sequence:

- Before measuring, clean the ring groove.






Cylinder Bore, Checking





Special tools, testers and auxiliary items required

• Internal Dial Gauge 50-100 mm

Test Sequence:

- Measure the bore at 3 locations in both directions - A - across the engine and - B - in line with the crankshaft.

Deviations from nominal dimension: Max. 0.05 mm.

Piston: Installed Position and Allocation, Piston/Cylinder

Pistons are identified on the piston head:

• Pistons 1 through 5: For cylinder bank 1

• Pistons 6 through 10: For cylinder bank 2

Positioning:

• Directional arrow on the piston head points to the intake side.