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.
1991 Mercedes Benz 350SDLFACTORY OEM SERVICE PROCEDURE
Ignition Base Timing
Check or adjust ignition base timing with engine at normal operating temperature, idle speed set to specification and distributor vacuum lines connected.
IGNITION BASE TIMING (Degrees BTDC@RPM)
| Application | Specification |
|---|---|
| 4-Cylinder | Information Not Available |
| 6-Cylinder | 7-11@Idle |
| V8 | Information Not Available |
DIESEL INJECTION PUMP TIMING
| Application | Degrees ATDC | ||
|---|---|---|---|
| All Models | (1) 14.5 | ||
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Factory Service Tools
Use the Manual With the Right Hardware
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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.