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 Clearances



PISTON RING CLEARANCE
Compression Ring:
New 0.06 to 0.09 mm (0.0024 to 0.0035 inch)
Wear Limit 0.20 mm (0.0078 inch)
Oil Scraper Ring:
New 0.03 to 0.06 mm (0.0012 to 0.0024 inch)
Wear Limit 0.15 mm (0.0059 inch)

PISTON RING END GAP
Compression Ring:
New 0.20 to 0.40 mm (0.0078 to 0.0157 inch)
Wear Limit 0.80 mm (0.0315 inch)
Oil Scraper Ring:
New 0.25 to 0.50 mm (0.0098 to 0.0196 inch)
Wear Limit 0.80 mm (0.0315 inch)