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 End Gap
First Compression Ring 0.250 - 0.400 mm (0.0098 - 0.0157 inch)
Second Compression Ring 0.350 - 0.050 mm (0.0138 - 0.0020 inch)
Oil Control Ring 0.250 - 0.760 mm (0.0098 - 0.0299 inch)

Piston Ring to Groove Clearance
First Compression Ring 0.040 - 0.095 mm (0.0016 - 0.0037 inch)
Second Compression Ring 0.040 - 0.095 mm (0.0016 - 0.0037 inch)

Oil Control Ring None - Side Sealing

Piston Ring Thickness
First Compression Ring 1.199 - 1.203 mm (0.0472 - 0.0474 inch)
Second Compression Ring 1.499 - 1.504 mm (0.0590 - 0.0592 inch)
Oil Control Ring 2.530 - 2.555 mm (0.0996 - 0.1006 inch)