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 to Groove Clearance
First Compression Ring 0.03-0.076 mm 0.001-0.003 in
Second Compression Ring 0.04-0.078 mm 0.002-0.003 in
Oil Control Ring 0.09 mm 0.004 in

Piston Ring Thickness
First Compression Ring 1.164-1.190 mm 0.046-0.047 in
Second Compression Ring 1.472-1.490 mm 0.058 in
Oil Control Ring - Maximum 2.440 mm 0.096 in