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

Compression Pressure @ Height
Test, Intake and Exhaust
680 N @ 30.19 mm
(153 lbs @ 1.18 inch)
Installed, Intake and Exhaust
228 N @ 39.99 mm
(51 lbs @ 1.57 inch)

Service Limit
Pressure Loss @ Specified Height 10% @ 30.09 mm (1.85 inch)