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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Cylinder Bore





Cylinder Bore

Standard diameter 86.70 - 86.73 mm (3.4134 - 3.4146 in.)

Clearance 0.02 - 0.04 mm (0.0008 - 0.0016 in.)

New bore size = measured outer diameter of piston + 0.02 - 0.04 mm (0.0008 - 0.0016 in.)[clearance] - 0.01 mm (0.0004 in.)[for horning]

Piston-to-cylinder clearance 0.02 - 0.04 mm(0.0008 - 0.0016 in.)