Pistons And Cylinder Bore, Checking

WARNING: This page is about a different car, the 2014 Volkswagen Beetle and 2013 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 mmVAS 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.

Piston and Cylinder Reconditioning Dimension

Honing Dimension

Piston Diameter

Cylinder Bore Diameter

Basic dimension

82.465. Refer to ⁽¹⁾.

82.51

⁽¹⁾	The measurement does not include the graphite coating, which is 0.02 mm thick. The graphite coating wears off.