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, Engine

Piston Rings
End Gap Measured In Cylinder Bore)
Piston Compression Ring Gap Production - Top Groove 0.010 - 0.016 Inch (in)
Production - 2nd Groove 0.018 - 0.026 Inch (in)
(Maximum)
Service - Top Groove 0.19 Inch (in)
(Maximum)
Service - 2nd Groove 0.0015 - 0.0031 Inch (in)
Piston Compression Ring Groove Clearance Production - Top Groove 0.0012 - 0.0027 Inch (in)
Production - 2nd Groove 0.015 - 0.0031 Inch (in)
Service 0.0033 Inch (in)
(Maximum)
Piston Oil Ring Gap Production 0.010 - 0.029 Inch (in)
Service 0.0039 Inch (in)
(Maximum)
Piston Oil Ring Groove Clearance Production 0.0018 - 0.0037 Inch (in)
Service 0.0039 Inch (in)
(Maximum)