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





Ring groove clearance





Piston Ring End Gap
Using a piston, push the piston ring a little beyond the bottom of the ring travel, 105 mm (4.13 inch) from the top of the cylinder block.





Standard end gap





Maximum end gap