Diesel Engine Specific Aid

What is a safe running temp for a 300cd non turbo?

It started out as running to cold, maybe 60 according to the gauge, so I replaced the t-stat with one rated at 176 (80centigrade) now the heater works much better and the car seems to have more power,but now the gauge is reading around 90. Is 90(centigrade) to hot?I know that modern gas powered cars usually run around 195 or more, but I just dont know what a 30 yr old diesel should be running at. are these cars prone to bad gauges or sending units(79 300cd)? I also noticed that my oil pressure has dropped at idle from 3 bars to 2.25, should I worry about this? any advice is much apprecieated!

Chassis Model Number

W123

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Diesel Engine Specific Aid

84 300D euro runs at high rpms on highway

I'm sure this has been addressed in the past but I didnt see it. I recently purchased an 84 300D Euro. I noticed right away that when I get up to highway speeds (70 mph) it seems to run at very high rpm. I checked that it is shifting through all the gears so it seems to be a rear end problem??? Is this something I can do by myself and what can I expect to pay for one? Any advice is much appreciated.

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W123

77 240d oil pressure

I have a 77 240D and was wondering the right oil pressure reading. Even at idle the gauge shows max pressure. I have another vehicle that shows different readings at different rpms. Now I saw a video on youtube that shows the same thing as my car does. Gauge is pegged even at idle. I'm running Shell Rotella 15W40 but will soon change to Amsoil synthetic. I've also read that there are a few O rings that are on the bar that goes through the oil filter that can affect the pressure. Any help would be appreciated.

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W123

Grinding into reverse-what parts 83' manual 300d euro?

Hi there. i recently purchased for my first diesel mercedes a fine specimin. It is a '83 300D Euro version, with a 4 speed manual. To make it even cooler, it had a turbo engine correctly installed some years ago. Anyway, it seems as if i will need a clutch very soon. This car technically doesn' exist in the parts lists. I have been told that i may not know what clutch it needs until i take it apart. My question is if anyone knows what i need and where to get it? Is it the same clutch parts as a 240D? Any help would be appreciated.

Chassis Model Number

W123

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Checking tranny fluid level

Hello, James here. OK I changed the filter on my tranny , per your instructions, everything went just as described. Only I am having one hellova time getting my fluid level right. I followed your inst to a T and yet somtimes it looks empty and sometimes its so full its way beyond the hash marks... If you Over fill ...what is the consequense? Other than fluid comming out the overfill hose? Stuck in a weird cycle of fluid ellusion James 82 123 300TD

Chassis Model Number

W123

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Diesel Engine Specific Aid

Air in the radiator lines or...

Hello ALL! James here. Guess what? My car dont like the cold, below 20 that is. At any rate I purchaced the engine warmer you guys at MS sell and it was easy to install with the helpful instructions.... though I do have one question about the 'air in the radiator lines'. Does there have to be constant fluid throught the entire system, including the top hose? Even when off? How can I be sure. I have drove the car for a few days and I have not plugged in the heater yet- we have had a mild winter so far, but I just want to make sure that all is well before I do.

Chassis Model Number

W123

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Diesel Engine Specific Aid

1977 300D sluggish after warming up.

I'm pretty new at these 5 cylinder diesel motors. Could someone point me to the temp sending unit? My temp gauge does not work and I wanted to start there to troubleshoot. I have not had this car very long, but I did notice that the secondary cooling fan was disconnected as well. I suspect that this is due to past electrical issues with various sensors (if this thing is anything like my 84' BMW) and was disconnected. It also seems sluggish lately after it warms up. However this may due be due to an over tightened alternator belt, possibly causing the heat to go up? (just put in a new regulator and I will check that out today)(this happened on my BMW when I tightened the belt too tight).

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W123

Vaccuum Problem - suspect Pump or?

I am purchasing a vaccuum tester and Kent's book becuase I likely have a vacuum problem based on these issues: Automatic Transmission shifts too early(fluid was changed); door locks sometimes work -usually they don't; Left front disk brake kicks in 1/4 -1/2 second after right. Lines appear to be in good shape..as well as vaccuum levers on valve cover- but I am thinking could be a main check valve (or other valve) problem. Not sure whether to do the vaccuum pump rebuild kit yet - until I read the book anyway. Anybody else experience these symptoms?

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W123

Fuel system troubleshooting...

Hello, My 82, 123 300TD is having fuel issues. I get 20 mpg! The engine runs strong, it has 250k on it. I purchaced the car about 6 mo ago... I used the diesel purge system you have with good results, all my filters are clean and new, and yet it still gets 20 mpg. I get a small amount of blow by, but even still I think there is a fuel problem somewhere. Do you suggest replacing the nozzels to start with? I am about to order the injectors and thought I would ask first. Is this a simple job, I saw you had tools for this and was going to order as well.

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W123

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