W123

1981 300TD-T Lack of Power

This 300TD-T has been running on Veg for about 3 years and 12k miles, I have owned it about 5 months. The rebuilt engine has 50k miles in it. Starting two weeks ago, the wife noticed a subtle power loss on hills and more white smoke than usual (this car has burned very clean except at start up). I drove the car last week, and tested it on a few residential hills in the neighborhood. At idle, the engine revs well…on the flats power is OK, but definitely not as strong as a few weeks ago… going up steep hills is impossible.

Chassis Model Number

W123

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Diesel Engine Specific Aid
$26.20

123 Right Hand Door Striker

Fits all 1977 to 1985 W123 sedans, coupes, and wagons single or both doors on the PASSENGER side. FREE VIDEO

1981 300TD-T "Switch Over Valve" disconnected

In doing some routine maintenance on our recently acquired 300TD-T I came across what has been called the "switch over valve" attached to the fire wall, next to brake booster. Both the vacuum line from the turbo and the alda have been disconnected and a short piece of hose connects the two.... a bypass. I understand that this can damage the engine. Is there any test to see if this valve still works before I reassemble the correct way?

Thanks is advance.

Steve

Chassis Model Number

W123

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Diesel Engine Specific Aid

85 300TD fuel sending unit wont fit

I have now tried to install two sending units with matching numbers in my 85 wagon, but they have both been about 1/4 inch too long. Was there more than one tank, one that was not as shallow as the other, available? It appeared as if one of the previous owners bent the tube on the old one to fit, so it would not hit the bottom of the tank. Can the sending unit be modified slightly to fit?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1982 300TD-T 315k miles Drivetrain Noise

At about 30MPH a whirring sound starts from the back end. Volume and pitch increases with speed... independant of road conditions. The noise only accurs when the drivetrain is under load/acceleration. While under load (as on a long grade), down shifting does not affect volume or pitch.

No clunkiness. Tire tread wear is "normal". SLS is working properly.

Any thoughts? Pinion bearing...Drive Shaft support bearing? I do not have a ton of experience in this area.

Thanks in advance!

Chassis Model Number

W123

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Transmission / Suspension Specific Aid

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