Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Piston: Specifications



Piston ring end gaps





Piston ring to groove clearance





Cylinder bores
Deviation from nominal dimension max. 0.08 mm

Piston and cylinder dimensions

Piston and cylinder dimensions:





1) Dimensions are without graphite coating (thickness 0.02 mm). The graphite coating wears away.