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 gap
Specification 82.4 mm (3.2441 inch) diameter gauge.
Compression (top)-gauge diameter 0.0039-0.0098 inch
Compression (bottom)-gauge diameter 0.0106-0.0165 inch
Oil ring (steel rail) - gauge diameter 0.0059-0.0255 inch
Compression (top) - service limit 0.0196 inch
Compression (bottom) - service limit 0.0255 inch
Oil ring (steel rail) - service limit 0.0354 inch
Ring groove width Compression (top) 0.0484-0.0490 inch
Compression (bottom) 0.0602-0.0608 inch
Oil ring 0.1192-0.0120 inch