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

Ring End Gap - Lower Ring - Maximum 1.20 mm (0.0472 inch)
Ring End Gap - Lower Ring - Standard 0.35 - 0.50 mm (0.0138 - 0.0197 inch)
Ring End Gap - Oil Ring - Maximum 1.05 mm (0.0413 inch)
Ring End Gap - Oil Ring - Standard 0.15 - 0.40 mm (0.0059 - 0.0157 inch)
Ring End Gap - Top Ring - Maximum 1.05 mm (0.0413 inch)
Ring End Gap - Top Ring - Standard 0.25 - 0.35 mm (0.0098 - 0.0138 inch)
Ring Groove Clearance - Lower Compression Ring 0.030 - 0.070 mm (0.0012 - 0.0028 inch)
Ring Groove Clearance - Upper Compression Ring 0.020 - 0.070 mm (0.0009 - 0.0028 inch)