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


Piston Ring
Piston Ring-To-Ring Groove Clearance
Top 0.020 - 0.065 mm (0.008 - 0.0025 inch)
Second 0.030 - 0.065 mm (0.0012 - 0.0025 inch)
Oil 0.07 - 0.16 mm (0.0028 - 0.0062 inch)
Maximum 0.15 mm (0.0059 inch)
End Gap (measured in cylinder)
Top 0.15 - 0.30 mm (0.0060 - 0.0118 inch)
Second 0.25 - 0.40 mm (0.0099 - 0.0157 inch)
Oil (rail) 0.20 - 0.70 mm (0.0079 - 0.0275 inch)
Maximum 1.0 mm (0.0394 inch)