Just in case the seal is bad, here is the part number.

Crankshaft Seal, Rear (93 X 114 X 13 mm)
MB# 017 997 74 47




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ASE Master Mechanic

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Noise Vibration and Harshness (NVH).
Dynamometer.
Heat exchanger durability.
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1985 300SD
1983 300D

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