Piston, Rings And Cylinder Bore, Checking

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

Fig 1: Identifying Check Of Piston Ring Gap

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

Feeler Gauge

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

To do this use a piston without piston rings.

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

Fig 2: Identifying Check Of Piston Ring Gap

Courtesy of VOLKSWAGEN GROUP OF AMERICA, 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

Fig 3: Checking Piston

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

External Micrometer 75 to 100 mm

-- Measure 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

Fig 4: Identifying Check Of Cylinder Bores

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

Internal Dial Gauge 50 to 100 mm

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

Deviation from nominal size: Max. 0.08 mm.

NOTE:

The cylinder bore must not be measured if the cylinder block is secured to engine stand using the engine lateral bracket T03001, or else results may be incorrect.