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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Speedometer Head: Testing and Inspection

SPEEDOMETER




1. Adjust the pressure of the tires to the specified level.
2. Set the vehicle onto a speedometer tester and use wheel chocks to hold the front wheels.
3. Check if the speedometer indicator range is within the standard values.

CAUTION: Do not operate the clutch suddenly or increase/decrease speed rapidly while testing.






NOTE: Tire wear and tire over or under inflation will increase the indication error.

Pointer vibration can be caused by a loose or dry speedometer cable.