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

Dimension & Clearance Specifications - Piston Rings

Piston Ring Compression:
Top Groove Side Clearance 0.05 - 0.027 mm (0.0019 - 0.0011 inch)
Second Groove Side Clearance 0.05 - 0.027 mm (0.0019 - 0.0011 inch)
Top Ring Gap 0.25 - 0.50 mm (0.010 - 0.020 inch)
Second Ring Gap 0.25 - 0.50 mm (0.010 - 0.020 inch)
Piston Ring Oil:
Groove Clearance 0.05 - 0.021 mm (0.0019 - 0.0082 inch)
Gap 0.25 - 1.27 mm (0.010 - 0.050 inch)