Piston, Rings And Cylinder Bore, Checking

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 Volkswagen Jetta, 2009 Volkswagen Jetta, 2008 Volkswagen Jetta, 2007 Volkswagen Jetta, and 2006 Volkswagen Jetta. However, it is still accessible from the selected car via links, so may be relevant.

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.