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 RING

Ring Gap:
Top Compression Ring 0.40-0.55 mm (0.015-0.021 in.)
Second Compression Ring 0.24-0.51 mm (0.009-0.020 in.)
Oil Control Rails 0.15-0.66 mm (0.0059-0.0259 in.)

Side Clearance:
Top Compression Ring 0.04-0.09 mm (0.001-0.0035 in.)
Second Compression Ring 0.004-0.08 mm (0.001-0.0031 in.)
Oil Ring Ring 0.06-0.21 mm (0.002-0.008 in.)