Sorry, I just saw the reply on the engine shock. On this engine, there are 2 items mounted on the front of engine, one is a little shock and the other looks like a shock, but appears to be a spring with a rubber hose around it. The engine was vibrating and he set his wrench up against the shock and the vibration noise stopped.

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1987 300SDL 265,000 mi.
1982 300SD 325,000 mi. (and holding)
1956 Packard Clipper 150,000 mi.