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)

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Piston Ring: Specifications

Piston Ring

Ring Groove Clearance
Top Ring 0.020-0.070 mm (0.0008-0.0028 in)
Second Ring 0.020-0.060 mm (0.0008-0.0024 in)
Oil Ring 0.020-0.065 mm (0.0008-0.0026 in)
Standard End Gap
Top Ring 0.2-0.3 mm (0.0079-0.0118 in)
Second Ring 0.3-0.5 mm (0.0118-0.0197 in)
Oil Ring 0.1-0.4 mm (0.0039-0.0157 in)
Maximum End Gap
Top Ring 0.5 mm (0.0197 in)
Second Ring 0.7 mm (0.0276 in)
Oil Ring 0.7 mm (0.0276 in)