You must lift the engine at least a bit before removing the heatshield(s) since the old mount will have collapsed onto it, pinching it in place.

Disconnect /watch fan shroud and throttle linkage as you lift engine. You have to lift it further than you think.

Do NOT let the main bolt x-thread when re-installing. Have a bar handy to tweak the engine side to side to align hole if neccessary.

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The Golden Rule

1984 300SD (bought new, sold it in 1988, bought it back 13 yrs. later)