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: Specifications

Piston Ring Gap And Groove Clearance

Top Compression Ring Gap 0.20 - 0.36 mm (0.0079 - 0.0142 in.)
Second Compression Ring Gap 0.37 - 0.63 mm (0.0146 - 0.0249 in.)
Oil Control (Steel Rails) Ring Gap 0.25 - 0.76 mm (0.0099 - 0.30 in.)

Top Compression Ring Side Clearance 0.051 - 0.094 mm (0.0020 - 0.0037 in.)
Second Compression Ring Side Clearance 0.040 - 0.080 mm (0.0016 - 0.0031 in.)
Oil Ring (Steel Ring) Ring Side Clearance 0.019 - 0.229 mm (0.0007 - 0.0091 in.)