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

System Specifications

Valve Spring:




Valve Spring Diameter [1]:
32.5 mm (1.30 in)

Valve Spring Length With Different Loadings:




Valve Spring Length [1]:
L 45.0 mm (1.77 in) @ no load
L1 38.0 mm (1.50 in) @ 280-320 N (62-70 lbs)
L2 27.0 mm (1.06 in) @ 710-790 N (156-174 lbs)


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[1]: Intake and Exhaust