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

Valve Spring

Valve Spring - Compression Pressure
Intake and exhaust (installed) 38.667 lbs.
Intake (valve open) 8.9 mm (0.35 in) of lift 97.032 lbs.
Exhaust (valve open) 7.4 mm of lift 93.338 lbs.
Free length 44.92 mm (1.768 inch)
Assembled height 37.9 mm (1.492 inch)