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)

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Valve Spring

1. Inspect each valve spring for cracking or damage. Replace spring as required.
2. Check spring free length and angle. Spring length should be 1.970 inch (50.05mm) and must not be less than 1.963 inch (49.85mm). Spring angle should not exceed .069 inch (1.75mm). If valve spring measurements are not as specified, replace spring.