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 Axial Clearance

Upper Compression Ring 0.050 - 0.090 mm
Lower Comression Ring 0.030 - 0.070 mm
Oil Scraper Ring 0.020 - 0.060 mm

Piston Ring Dimensions

Upper Compression Ring 1.20mm
Lower Compression Ring 1.75 mm
Oil Scraper Ring 3.00 mm