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 Gap & Groove Data

Top Groove Side Clearance 0.002-0.0033 in
Second Groove Side Clearance 0.002-0.0035
Top Ring Gap 0.006-0.014
Second Ring Gap 0.0197-0.0280
Oil Ring Groove Clearance 0.008
Gap with segment at 89.0 mm (3.50 inch) 0.0098-0.05 in