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 gap measurement:
Top compression ring gap 0.40 to 0.55mm (.015in to.0217 in.)
Second compression ring gap 0.25mm to 0.50mm (.0099 to.0197 in.)
Oil control ring gap 0.20 to 0.40mm (.0079 to.0158 in.)

Piston ring to groove clearance:
Top compression ring gap 0.12 to 0.16 mm (.0048 to.0063 in.)
Second compression ring gap 0.065 to 0.110 mm (.0026 to.0044 in.)
Oil control ring gap 0.03 to 0.07 mm (.0012 to.0028 in.)