Pistons And Cylinder Bore, Checking: Notes

WARNING: This page is about a different car, the 2014 Volkswagen Beetle, 2013 Volkswagen Beetle, and 2012 Volkswagen Beetle. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Checking 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 to 0.40	0.8
Oil scraping ring	mm	0.25 to 0.50	0.8

Fig 2: Checking Piston Ring Gap

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

Feeler Gauge

-- Clean the ring groove before checking.

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

Fig 3: Checking Piston

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Special tools and workshop equipment required

Micrometer gauge 75 - 100 mm VAS 6071

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

Deviation from nominal dimension: Max. 0.04 mm

Fig 4: Checking Cylinder Bores

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

NOTE: Cylinder bore must not be measured if cylinder block is secured to engine stand with Engine And Transmission Holder - Engine Lateral Bracket T03001, or else results may be incorrect.

Special tools and workshop equipment required

Internal Dial Gauge VAS 6078

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

Deviation from nominal size: Max. 0.08 mm.