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

Standard Ring Groove Clearance
No.1 0.040 - 0.080 mm
No.2 0.030 - 0.070 mm

Standard End Gap
No.1 0.300 - 0.500 mm
No.2 0.400 - 0.600 mm
Oil (side rail) 0.150 - 0.550 mm

Maximum End Gap
No.1 1.100 mm
No.2 1.200 mm
Oil (side rail) 1.150 mm