Overhaul

Piston rings, cylinder bores and piston positioning





Checking piston ring gap

Special tools, testers and auxiliary items required
^ Feeler gauge

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








Checking ring to groove clearance

Special tools, testers and auxiliary items required
^ Feeler gauge

Test sequence
- Clean ring groove before checking.








Checking cylinder bores

Special tools, testers and auxiliary items required
^ Internal dial gauge 50 - 100 mm

Test sequence
- Measure bores at 3 locations in both directions - A - across engine and - B - in line with crankshaft.

Deviations from nominal dimension: max. 0.05 mm.

Piston: Installed position and allocation, piston/cylinder
Pistons are identified on piston head:
^ Pistons 1 through 5: for cylinder bank 1
^ Pistons 6 through 10: for cylinder bank 2

Positioning:
^ Directional arrow on piston head points to intake side.