Piston: Testing and Inspection

Piston Ring Gap, Checking
Special Tools, Testers And Auxiliary Items
- Feeler gauge set

Test Sequence
- Using a piston without rings, squarely push ring down into cylinder to a depth of approx. 15 mm (0.6 inch) from lower end of cylinder

Piston Ring Gap Dimensions Table





- Insert feeler gauges into ring gap to determine clearance value





Ring To Groove Clearance, Checking
Special Tools, Testers And Auxiliary Items
- Feeler gauge set

Piston Ring To Piston Dimensions Table





- Clean ring grooves before checking





Piston, Checking
Special Tools, Testers And Auxiliary Items
- 75 to 100 mm micrometer

- Measure pistons approx. 6 mm from lower edge of skirt, at 901 axis to piston pin
Deviation from nominal dimension: 0.04 mm (max.)





Cylinder Bore, Checking
Special Tools, Testers And Auxiliary Items
- 50 to 100mm Inside dial gauge

Test Sequence
- Measure bore at 3 locations in both directions -A- across the block and -B- in line with crankshaft
Deviation from nominal dimension: 0.08 mm (max.)

CAUTION:
^ DO NOT measure cylinder bores with the block mounted on an engine stand.
^ Natural distortion due to hanging weight will cause measurement errors.

Piston And Cylinder Dimensions Table