Volkswagen Workshop Service and Repair Manuals > Polo Mk5 > Power unit | 4-cyl. injection engine with timing chain | Enginecrankshaft group, pistons | Pistons and conrods

Checking piston

Special tools and workshop equipment required

t	External micrometer 75...100 mm

Checking piston

–	Measure pistons approx. 12 mm from the lower edge of skirt, at 90° to the piston pin axis. Difference between actual and nominal diameter: not more than 0.04 mm. Nominal dimension → Chapter

Checking piston ring gap

–	Push ring squarely from above down into cylinder bore to approx. 15 mm from bottom end of cylinder.

¹⁾	No wear limit details

Checking ring-to-groove clearance

Clean groove before check.

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