Volkswagen Workshop Service and Repair Manuals

Piston rings, cylinder bore and piston installation position

Checking piston ring gap Special tools and workshop equipment required t  Feeler gauges –  Push piston ring squarely from above down to approx. 15 mm from bottom end of cylinder.

Piston ring dimensions in mm	New	Wear limit
1. compression ring	0.20...0.40	1.0
2. compression ring	0.20...0.40	1.0
Oil scraper ring	0.25...0.50	1.0

Checking ring-to-groove clearance Special tools and workshop equipment required t  Feeler gauges –  Clean ring groove before checking.

Piston ring dimensions in mm	New	Wear limit
1. compression ring	0.06...0.09	0.25
2. compression ring	0.05...0.08	0.25
Oil scraper ring	0.03...0.06	0.15

Checking cylinder bores Special tools and workshop equipment required t  Internal dial test indicator 50…100 mm –  Take measurements at 3 positions in both transverse -A- and longitudinal -B- directions, as illustrated. Difference between actual and nominal diameter max. 0.10 mm.   Note Cylinder bores must not be measured when the cylinder block is secured to engine and gearbox support -VAS 6095/1- with universal mounting -VAS 6095-, as measurements may be incorrect.

Piston installation position and allocation of piston to cylinder Arrow points towards No. 1 cylinder -arrows-.