W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

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Chassis Model Number

W123

Which Diesel Fuel Additive?

I have an 82 240D and I've been considering using fuel additives. I've heard that they give your engine more power and help keep your injectors cleen and do various other healthy things for old mercedes diesel engines. Is this true? What, if any, fuel additives do you guys use/recomend?

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Auxiliary electric water pump needed?

I'm going to order and install the Climate Control Servo bypass kit for my 1980 300SD. The original servo is no longer working, neither is the auxiliary pump, and I'm tired of no heat control. Right now it's all heat all the time. The auxiliary pump has been broken for a lot longer than the servo, and I've been able to get adequate heat from the climate system. My question is, do I really need the auxiliary pump? I know it's recommended, but aux pump only really works during idle. Why can't I just put a U shaped pipe there in place of the auxiliary pump?

Chassis Model Number

W116

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123 power window issues

Hey, I have a 1982 240d and am having some problems with my power windows. First, on the back driver side window, will go down, but it will not come back up, and on the back passenger side, the window goes up and down, but it goes really slow. Any suggestions? Also if anyone knows of any place in Washington state that I could get parts for my mercedes, it would be very appreciated. Thanks.

Chassis Model Number

W123

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Vacuum Routing - 1983 300sd

Hey Kent: The vacuum book has help alot,but I have a problem that I cannot find help anywhere. The 3/2 valves are really 2 on top of one another. When I got the car several of the curved lines were rotted,and where they plug into the plastic 5-way connector ( which the rubber conector plugs into) was missing tits. So I used the diagram for the 80 to 81 300D and 240D trying to get the vac working right.I stopped the clunking slowing down to a stop.1,2,an 3rd shift ok but early,but 4th wants to slip then shift. Unless you drag race,it shifts fine.So I drive her in 3rd and shift to 4th on my own. Will the diagram I used work?

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Chassis Model Number

W126

removing the glovebox door lock on an '85 300D

I need to remove the lock on the glove box door in order to replace the wood trim strip. I got the black plastic glove box inner liner off. The sliding plastic lock appears to have four tabs that lock it in place in the sliding track. I tried to push in those tabs with a screwdriver, with no success. Is there some trick to removing the sliding lock piece?

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240D Speedometer Inaccurate

Hello, I have a 1983 240D, manual transmission. The Speedometer seems to read about 8 - 12 miles slower than the real Speed. The wheels on the car are OE. I have had the car since about 130,000 miles. It now has 150,000. The previous owner said this has been a long running issue that they never bothered to look into. I get confused sometimes at my real speed (especially if the police are behind me!). Any tips on what I should do? Replace cable? Or replace Speedometer? Thanks!

Chassis Model Number

W123

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SPEEDOMETER/ODOMETER FAILURE ON 76 300D

THE ODOMETER AND SPEEDOMETER RECENTLY QUIT WORKING ON MY BENZ. RIGHT BEFORE IT COMPLETELY QUIT, I NOTICED THE NEEDLE FOR THE SPEEDOMETER BOUNCED AROUND ALot, then...nothing. some of the lights, such as glow plug, brake sensor and battery lights still work, but the regular illuminary dash lights do not. I replaced the bulbs, but still no light. Also the old becker radio did not work and i pulled it out, but can't seem to figure out what config. to hook up a cd player. could the radio issue be related to the failures on the instrument cluster?

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Chassis Model Number

W115

1982 300d auto tran. electrical switch issue, won't start, help!

I just replaced rear transmission mount and installed new transmission linkage bushings with your kit. All went great!

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Chassis Model Number

W126

350SD: Car shakes heavily at low idle once warmed up.

Hi, My wife has a 350SD (W126 - 1991) with 146k miles. We have had it only for the last 15k miles or so. The car has developed a strong throbbing, low frequency vibration or shaking (the whole car) when stopped at a stop light (for example) after it has been driven for a while and is well warmed up. It is slightly noticeable, but much less severe, when started up from cold. Otherwise, the engine seems to run smoothly and be OK at higher RPMs. I have noticed that the idle speed drops a little from, >6500 to

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