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Mercedes-Benz 300-Class, Engine, Fuel System, Diesel, Coupe, Sedan
#472 of 2332 Re: Any Advice????? [djocks]
Jun 03, 2005 (7:41 am)
Just some general observations about owning any Mercedes. From a mechanical standpoint they are extremely well built. Most ordinary parts like starters, alternators, radiators, etc. are readily available at decent prices.
In my opinion, having owned a total of 5 Mercedes is they can be a money pit when they get old. My daughter's '86 190E had a fuel injection problem that cost more to repair than the car was worth. All of the M/B's I've owned have all had A/C control system failures both electronic and vacuum. That's over and above the typical leaks associated with all cars. My '87 30SDL is in the shop today.
I own them because they have a classic look, I enjoy restoring older vehicles, and my first car was a rusty beatup 240D that lasted forever.
Oh I forgot, the sound systems sucked but I've never owned a 1993 or newer.
#473 of 2332 Re: Should I? 1982 300TD 300k + [willum0330]
by MrShift@Edmunds HOST
Jun 03, 2005 (5:16 pm)
Yes, you MUST flush the brake fluid. You'll be sorry if you don't.
Vacuum line diagram:
You might try over at www.mercedesshop.com; otherwise, if he can't help you (he knows a lot) you'll have to buy the factory shop manuals (set of 3) which are well worth the money if you really like these cars and like working on them. They aren't cheap but after your first home repair you've paid for them easily.
RE; BENZES in general. Old rule of thumb: "whatever got you into that used Benz cheap will eat you for breakfast sooner or later".
So buy the best used Benz you can afford. Don't buy a project car, you can't win...if you're in it for fun, then great, it's not such a problem and you're doing a lot yourself, but sometimes it is much much easier to spend more money up front and get a really well cared for Benz. Only the very skillful and clever and patient should buy a "fixer upper".
Stay away from 190Es, that was not a great model.
#474 of 2332 82 300D surgeing problems
Jun 04, 2005 (5:53 pm)
have an 82 300D turbo, was driving to work this am and felt some surging at normal frwy speeds when I was driving. My car then began to loose speed on hills and then on normal flat roads. All the fluids and filters have been changed and was wondering if anyone might have suggestions as to the cause. My top speed was around 45-50 mph after the surging started. No smoke or loss of oil pressure or busted hoses, and other than the surging and loss of power no other symptoms I can list. Any help would be great. Thanks.
#475 of 2332 Re: 82 300D surgeing problems [amonra22]
by MrShift@Edmunds HOST
Jun 04, 2005 (7:01 pm)
Sounds like bad injectors maybe? You should also put in a strong additive to try and clean them. Also check your turbo tubing for any loose connections or leakage, and finally, check for a sticking or malfunctioning turbo wastegate. If your wastegate is dumping boost randomly, this could account for your symptoms, as could a very irregular spray pattern on the injectors. I'd really have to drive it to tell you the differet feel of these two deficiences.
Jun 05, 2005 (5:06 am)
Have used a fuel additive in my last 2 tanks of diesel. Changed the fuel filter and lines could some of my problem be waste from the fuel tank clogging the fuel lines, and I should replace my fuel filters again? How often do you recommend fuel filter replacement? If my wastegate is malfunctioning or sticking how can I tell? The surge in power is very slight not like the turbo is kicking in like you are pushing the gas peddle and then letting up on it quickly. Could you recommend an injector cleaner? Thanks.
#477 of 2332 Re: power loss [amonra22]
by MrShift@Edmunds HOST
Jun 05, 2005 (7:17 am)
Yes, BGK44 is a good injector cleaner. A bit expensive but it works.
Other possibilities? Maybe your cruise control is kicking in and out by itself? Perhaps you can disable it by pulling the fuse temporarily? Usually Mercedes cruise control on these cars conveniently disables itself, or runs amok, and often---it's quite unreliable. I'm just trying to think of different things it might be. Just pray your injection pump is okay. It's VERY rare for that to go out. I believe it is also adjustable (the pump) but this would require an expert who knows EXACTLY what he is doing.
#478 of 2332 High tempratures, bad turbo?
Jun 06, 2005 (9:56 am)
Okay, here's something new for all of you.. I only hope someone has an answer.
I bought this car about 7 months ago, it's a 1984 300D European (Yes, it's gray market.. most things are written in german, it has a top-front filling radiator, and the three-dial system for the A/C. The car was apparently non-turbo when produced in Germany, but a turbocharger (and transmission) were later added. I checked, and sure enough, there was the old turbo.
Now, the problems. I've owned an American 300D prior to this one, which had more problems than I ever wanted to deal with, so I ditched it for this one. The car isn't the fastest thing in the world, but I have to wonder if the turbo is even working at all. On the american one, it sounded fine.. the car would rev, shift, and the turbo would go *Pfsst*. Pretty fast little thing, too.. for a diesel. Fast forward to now, and instead of hissing when shifting, the turbo sounds like it's constantly purging. During acceleration, there is a constant hiss. It's probably the wastegate valve, like I've read on many topics.. but where is this valve located, and how do I unstick it?
The only other major problems I have, is the A/C system. I turn the dials to cold (For the right and left sides of the car), close the middle vent slider, and turn the upper dial to 100 (for 100% through the compressor). As soon as I turn it off 0, I hear a relay under the dash click, but the engine won't even bother engaging the compressor. My guess, is that the system simply has no R-12 in it, and it just needs to be recharged. Probably leaks, too.. but that's for a later time. Also, there is a small rainwater leak in the rear right floorboard.. my guess, is that it comes in from the sunroof (This one has a manual sunroof with a tommy-lock.. which I personally like better than the clunky auto one I had). My question is.. how do I clean the sunroof drains?
Thanks in advance for the help.. oh! And one more thing.. is there a way I can determine the engine model? Since this car differs so much from the American model (even has cloth seats), I want to make sure it's not just a 240D in disguise.. so where on the engine would the OM617 designation be? Thanks guys!
#479 of 2332 Re: High tempratures, bad turbo? [zero3k]
by MrShift@Edmunds HOST
Jun 06, 2005 (4:12 pm)
It can't be a 240D as those are 4 cylinder cars.
First thing you need to determine is your chassis type...is this car a W123, W116 or W126? Then you'll know if it had a turbo from the factory or not.
I can't imagine anyone would go through the hassle of adding a turbo to a non-turbo W123 but they could have installed an SD or SDL engine I suppose.
I think you are correct about your diagnosis regarding the turbo and the AC problems.
#480 of 2332 Re: High tempratures, bad turbo? [Mr_Shiftright]
Jun 06, 2005 (4:52 pm)
The chassis type is definately a W123.. I fell in love with that design ages ago, and haven't turned back, since. Like I said, the car is gray-market, so I honestly am not sure what they come with over there in Germany.
Totally forgot that the 240 was only 4CYL.. whoops. The engine type is an OM617 (Engine says R-O617.9..something), so I'm pretty sure it's a 300D engine. Found it printed on the side of the engine, near the injection ports. Anybody else have one of these Euro models? A good deal of stuff on it, is pretty foriegn to me, compared to my old US model. For example, I can't find the upper valve for the A/C system (to charge / discharge). The lower valve seems to be on the compressor itself, and the upper? Who knows.
Now, if I only knew what the wastegate valve looked like, where to find it, and how to fix it.. I'd be set!
Jun 06, 2005 (7:55 pm)
617 isn't necessarily just a 300D engine. It could be a turbo engine from another model. I'd have to look it up. They are all 617s but might have different numbers after the decimal. It would be better if it wasn't a stock 300D engine, they really weren't built for turbos, but probably would be okay with low boost. Most turbo engines are strengthened internally.