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

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Piston: Testing and Inspection



Pistons and connecting rods, disassembling and assembling

Checking pistons

- Special tools and equipment






- External micrometer 75-100 mm

Measure approximately 6 mm from bottom edge, offset by 90 ° to piston pin axis.

Deviation from nominal dimension max. 0.04 mm