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)

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Piston Ring, Engine

Piston Compression Ring Gap (Production-Top Groove) 0.010 - 0.020 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
(Production-2nd Groove) 0.018 - 0.026 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
(Service-Top Groove) 0.010 - 0.025 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
(Service-2nd Groove) 0.018 - 0.035 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
Piston Compression Ring Groove Clearance (Production-Top Groove) 0.0012 - 0.0027 Inch (in)
(Production- 2nd Groove) 0.0012 - 0.003 Inch (in)
(Service Limit-Top Groove) 0.0012 - 0.0035 Inch (in)
(Service Limit-2nd Groove) 0.0012 - 0.0035 Inch (in)
Piston Oil Ring Gap (Production) 0.010 - 0.030 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
(Service) 0.010 - 0.035 Inch (in)
Piston Ring End Gap Measured in Cylinder Bore
Piston Oil Ring Groove Clearance (Production) 0.002 - 0.008 Inch (in)
(Service) 0.002 - 0.009 Inch (in)