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)

Or, hide this message: temporarily or permanently

Piston Ring, Engine

PISTON RING GAP
Compression Ring No. 1 0.20-0.35 mm (0.007-0.013 in.)
Compression Ring No. 2 0.20-0.40 mm (0.007-0.015 in.)

PISTON RING WIDTH
Compression Rings 1.5 mm (0.059 in.)
Oil Ring (Steel Rails) 3.5 mm (0.137 in.)