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Ok so I had a chance to give the car a brief once over. It’s a 1985 mercedes benz 300cd with about 180,000 miles on it. It has a leaking fuel filter, bad engine mounts, the vacuum check valve is bad, and a vacuum line going to the drivers door is probably bad. Other than that I didn’t notice anything immediately that needs attention. I am going to give it a thorough twice over sometime this week. If anyone has any advice, things to look out for, or any forums that may help let me know. Thanks
P.s. I am not really well versed in diesel mechanics. I understand the basics but, anyone who can help me with preventative maintenance (which is kind of redundant) would be doing me a great service.
Fuel pressure is everything with a diesel engine so I would fix the fuel leaks first. When confronted with an engine vibration I start with the engine first and THEN look to the engine mounts. If however you’ve already found a bad engine mount of corse replace it. The vacuum leaks won’t effect performance, diesel engines don’t have much vacuum, they often run separate vacuum pumps for the vacuum they use. Mercs often have problems with the door lock actuators due to vacuum leaks BTW. That should get you started.
It does have a vacuum pump, it also has a vacuum reservoir in the trunk. The door locks don’t work at all and the engine sputters a bit when you turn it off so I’m guessing (because it uses vacuum to cut off fuel when the key is turned to off) that it has a vacuum leak somewhere. The engine mount on the driver’s side is definitely bad, probably due to the leaking “prefilter” that sits a couple inches above it. I’m going to check the valve adjustment too. How exactly would I check the glow plug’s? I know where they are and how to get them out but I’m not sure how to test them.
The car was supposed to be here last week but the appointment got postponed until sometime next week. I’ll keep you guys updated.The glow plugs get hot. Supposed to help vaproize the fuel on cold days. If the compression is good you won’t need them unless its very cold. Not famaliar with cars but on my J.Deer you hold the key just less than start till the light comes on.
I think they are getting hot I just want to know if there is any way to test them so I can be sure they are working up to spec. Also is there a tool I can use to clean out the glow plug ports? I’ve heard that you can get carbon build up around those ports.
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