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 Rings
Piston Ring End Gap
First Compression Ring 0.150-0.300 mm 0.0059-0.0118 in
Second Compression Ring 0.280-0.480 mm 0.0110-0.0189 in
Oil Control Ring 0.150-0.600 mm 0.0059-0.0236 in

Piston Ring to Groove Clearance
First Compression Ring 0.030-0.065 mm 0.0012-0.0026 in
Second Compression Ring 0.015-0.060 mm 0.0006-0.0024 in
Oil Control Ring 0.030-0.170 mm 0.0012-0.0067 in
Piston Ring Thickness
First Compression Ring 1.175-1.190 mm 0.0463-0.0469 in
Second Compression Ring 1.470-1.495 mm 0.0579-0.0589 in
Oil Control Ring 2.360-2.480 mm 0.0929-0.0976 in