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.
1985 Mercedes Benz 190D AutomaticFACTORY OEM SERVICE PROCEDURE
Vacuum Amplifier
- Connect Vacuum Tester (116 589 25 21 00) with "Y" fitting to connection "A" and read vacuum value at idle speed. Value for manual transmission is approximately 9 in. vacuum. Value for automatic transmission is approximately 10 in. vacuum.
- If vacuum is above or below specified value, adjust vacuum. To adjust vacuum, pull off dust cap from vacuum amplifier and turn adjusting screw with a 4 mm socket wrench until specified value is obtained. If vacuum value is not okay, go to step 3).
- Check supply vacuum at connection "B". See Fig 1 . Replace vacuum amplifier, if necessary. Check vacuum lines.
Factory Service Tools
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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.