W126

83' 300 SD Help with oil coolant line removal?

Lower coolant line leaking at the radiator. Got the two lines unscrewed at both ends and the clamp removed. Is it possible to remove these lines without lifting the left side of the engine and removing the motor mount?
If the mount must be unbolted, is it possible to remove just the screws that attach the motor mount arm to the engine and then just the motor up to slide the lines over the arm and under the engine?

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82 300SD Overheating Problem - Pulley?

My 82 300SD with 202,000 miles has been running hotter than it should be at highway speeds above 70 MPH. Not at red line but uncomfortably above the 100 degree mark and at 110 degrees ambient was getting close to red line last summer. At slower speeds and idling it does not run above 100.

My mechanic thinks he recalls there was a mfg modification to the water pump pulley in later year models like after 84/85 that replaced the pulley with a smaller one to make it turn faster.

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