Piston, Rings And Cylinder Bore, Checking

WARNING: This page is about a different variant/trim than selected.

Piston Ring Gap, Checking

Fig 1: Checking Piston Ring Gap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools and workshop equipment required

Feeler Gauge

-- Insert the ring into the lower cylinder bore at a right angle from above, approximately 15 mm from the cylinder edge.

Piston Ring		Gap
		New	Wear limit
Compression rings	mm	0.20•••0.40	0.8
Oil scraping ring	mm	0.25•••0.50	0.8

Piston Ring Groove Clearance, Checking

Fig 2: Checking Piston Ring Gap

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools and workshop equipment required

Feeler Gauge

-- Clean the groove for the ring before checking.

Piston Ring		Ring to Groove Clearance
		New	Wear limit
Compression rings	mm	0.06•••0.09	0.20
Oil scraping ring	mm	0.03•••0.06	0.15

Piston, Checking

Fig 3: Checking Piston

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools and workshop equipment required

Micrometer 75-100 mm VAS 6071

-- Take the measurement approximately 10 mm from the lower edge of the piston skirt and offset 90° to the piston axis.

Deviation from nominal dimension: Max. 0.04 mm

Cylinder Bore, Checking

Fig 4: Checking Cylinder Bores

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Special tools and workshop equipment required

Cylinder Gauge VAS 6078

CAUTION:

Do not bore, hone, grind or rework the cylinder bores with workshop tools. Reworking damages the surface of the cylinder bore.

-- Measure diagonally at 3 positions transversely -A- and longitudinally -B-.

Deviation from nominal size: Max. 0.08 mm.

NOTE:

The cylinder bore measurement must not be performed if the cylinder block is secured to assembly stand using the engine and transmission holder VAS 6095, since inaccurate measurements are possible.