Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Ignition Timing
Timing is checked with engine at normal operating temperature, idle speed set to specification and Man. Trans. in neutral or Auto. Trans. in "D". Connect a timing light and tachometer to engine. Start engine and rotate distributor until specified mark on crankshaft pulley aligns with indicator pin.
| Application | Man. Trans. | (1) Auto Trans. | ||
|---|---|---|---|---|
| GLC | 8@850 | 8@750 | ||
| GLC Wagon | 8@800 | 8@750 | ||
| 626 | 5@650 | 5@650 | ||
| B2000 | 8@650 | ... | ||
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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