W123, Electrical

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

1979 W123 replacing ignition switch

I put new glow plugs, new batt,new relay, new strap fuse on my 123. Key turns it over but indicator light doesn't go on sometimes. Before I replace the ignition switch, should I first check the trans solenoid and neutral safety switch? Thanks

Chassis Model Number

W123

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Body and Interior Specific Aid

$2.49

Fuel Tank Sending Unit Oring

280SE 240D 300D 300CD 300TD 300SD/L 380SE/L 420SEL 560SEL 560SEC 350SL 450SL 380SL 560SL

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

$3.95

123 Chassis Lower Body Moulding Nylon Attachment Clips

For all 123 Chassis 280E 280CE 240D 300D 300CD and 300TD 1977 TO 1985

SVO / Biodiesel

Installing a Mercedessource Diesel to Vegetable Oil Fuel Conversion

We offer an easy to install kit or you can build one from our components

$27.50

617 Diesel Garrett T3 Turbocharger Installation Gasket Set

For all 5 cylinder turbo 300SD 300D 300CD and 300TD 1978 to 1985

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

Up the tire size 1983 300D Turbo Diesel

My stock tire size is 195/70 14 ~ 24.75 inch diameter. I was considering moving up to 205/75 14 ~ 26.1 inch diameter or 215/70 14 ~ 25.9. This would, in essence, give me the effect of an overall higher read end ratio. It feels as if the engine is revving more than it should at 65 - 70mph. Is this advisable? Also, what should the expected mile-per-gallon be for this year/model assuming everything is running correctly, and a conservative driving style? Thx, Bill

Chassis Model Number

W123

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Transmission / Suspension Specific Aid

Engine

Inspecting the Voltage Regulator BEFORE it Fails and Leaves You Stranded

Do it very soon unless you know it have been done within the last 50,000 miles.

W123, Electrical

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