W123

Leaky head gaskey on 300TD

The head gasket on my 300TD wagon is leaking and my mechanic said you can drive years with this condition. Being a major investment, how important is this to get done? Is there a reasonable chance of serious damage if it's not fixed soon? The mileage hasn't been so good since we got it, don't know if this repair would help that. I think I'm going to replace to injector tips soon to see if that helps mileage a bit. Thanks for any feedback.

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Diesel Engine Specific Aid

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W123

Tachometer question

Good Morning all, 1983 300CD. This is a new purchase and the TACH and Clock are not working. I purchased the "HOW TO" from you concerning the removal and replacement of the dash and related gauges. First, there is 12 volts to the clock so I have to assume the clock itself is bad. I can live without that ; however, the connection going to the tack show 8.3 volts. My question, is that the correct voltage? It does not change with engine RPMs. Additionally, I am unable to find the Amplifier on the L/inner fenderwell. I wanted to check it but I am unable to locate it ANYWHERE.

Chassis Model Number

W123

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Diesel Engine Specific Aid

Heater and Tach problem for a 1982 300 CD TD

I found no repair Manuals and/or Diagnostic Guides to diagnose my AC/Heater and Tach problem. My heater does not come on when I want it to come on. Most of the time, nothing. I would press the buttons on the climate control and hear contacts, I would roll the temp setting wheel and hear contacts in AC as well in heating. I have source parts and like to repair it myself. I am willing to do a rebuilt, if possible. The Tach either jump around or does not work or works normally, mostly jumps around. This bothers me

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W123

Tranny Vacuum Dashpot Location for 1980 300D

I am a reletively new owner of a 1980 300D, and learning as I go. I've recently been trouble shooting the lack of heat, which means the vacuum system. I've got heat back, but the tranny feels like it is slipping as it shifts gears. I purchased a transmission daspot, but the car doesn't have one currently installed. Should my 1980 300D have a dashpot? If so, where should it be installed? Your help is appreciated.

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W123

300D Power Loss?!? Uh oh!!!

On my drive in to work in my WVO-powered 1983 300D-T this morning, I had been driving on the freeway for just about 5 minutes or so and all of a sudden the car started losing power! I was worried that the transmission was giving for a moment, since that's been a "watch" item, but the revs didn't shoot up like a typical "flare". The guts just went away and the engine was not spooling up. But the engine didn't quite die... Nervously, I stomped the accelerator for a moment and it seemed to "fight through it" and the power charged back, and right then a curious thing happened... The fuse carrying the tachometer blew out right when the car came back to life as if there was a surge. Related? No?

Chassis Model Number

W123

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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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