W123

85 300TD A/C belt keeps coming loose.

I'm having an issue with my A/C compressor belt on my 85 300td. It keeps coming loose.

When I bought the car 2 months ago, the belt was missing completely and I was not sure if the A/C worked or not. I installed a new conti belt. The a/c works perfectly except after 200 miles or so the belt comes loose. Yesterday I checked the belt and now it looks slightly chewed up on one side.

I'm not sure if the problem is A/C pulley or something else.

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1982 300DT vacuum troubleshooting

I recently purchased the Vacuum Troubleshooting kit and have begun to tackle some minor issues with my wagon.
Right off the bat I find something not specified in your manual.
I started with a vacuum pump test and my gauge is reading 16.5 inHG. When I remove the line from the booster it reads 19 inHG - neither seems REALLY low, but are below the 20-23 inch range.

I have two questions:

1. Is there a way to determine if my checkvalve is leaking versus a slow leak in the pump itself?

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79 W123 300D- compression check w/o radiator in place?

Have a blown radiator which I pulled- How do I do an engine compression check to rule out cracked head or blown head gasket w/o the rad in place? Doesn't make sense to reinstall the radiator (-it's blown) or install a new rad just to test. Any ideas will be welcome as none of the mechanics down here seem to have any clue...

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83 300D Turbodiesel - Strong vibration under load

I recently purchased this 83, 123 chassis Turbodiesel about 3 months ago. It has 160K miles and has been very well maintained. I recently replaced the injectors, glow plugs, adjusted the valves twice, with three weeks between adjustments, and the compression currently checks out at 340,380,380,380,380. I got quite a bit of benefit from doing a diesel purge, banjo cleanout, and ALDA adjustment. All of my efforts are aimed at bringing this car as close to optimal operations as possible.

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