Unfortunately, the Geniuses in Charge of Motor Mount Engineering In Deutschland have followed the rest of the Industry
(From Ahead by by about 15 years) in using Hydraulic [Liquid Filled]
Motor Mounts.

When they Fail (As they invariably do) they are "Collapsed" and LOWER
the Engine in relationship to the Chassis.

There are only Two solutions:

Replace with O.E.

Drill out Your mounts and Drain,Clean and Refill with Approximately 35-40 SHORE A Urethane.

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YOU May be able to "Lift" the engine with "whatever method" and be able to "Insert" the Starter.

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'84 300SD sold
124.128