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 Clearance: Adjustments



On 4-97.6 (except Nova) and 4-112 overhead cam engines, valve lash is obtained through the use of hydraulic valve lash adjusters (4-97.6) or compensators (4-112). No provision for adjustment is provided.

4-151 engines are equipped with hydraulic valve lifters. No provision for adjustment is made for these engines.