W116, BENZ AID - COMMON QUESTIONS AND ANSWERS

Diesel Injector Seat Cleaning

1976 W115 300D
Do you recommend a specific tool, chemical, or (wire?) brush etc to clean the metal seat where the Diesel injector crush washers mount onto/in the prechamber? There is apparently a thin "film"/spots of thin carbon? very hard carbon in this area that seems to be very hard to completly remove, when attempted to clean this area. Some of this thin film of carbon? appears to remain after wire brushing with a small wire brush. I am looking for the proper tool , chemical and or procedure for cleaning this area.

Chassis Model Number

W115

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Diesel Engine Specific Aid

1980 300D "passing" gear and faint whistle when turning right

If I push on the accelerator with only modest pressure (especially when the car is cold), it often jumps into what I assume is a "passing" gear. I've dealt with the problem by just being cautious with the accelarator - often, I just let up on the gas when I hear it jump into "passing" mode, but I was wondering if there's a repair I can try.

Chassis Model Number

W123

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Diesel Engine Specific Aid

'83 300TDT NeedleBearings in Filter

I recently put a used transmission into a friends car, and adjusted it according to the mercedessource manual with the mercedessource tools, etc.

The used unit I pulled was from a crunched car ( a good sign the car was being driven before arriving in the junkyard) the fluid was clean, didn't smell, as well as no metal in the pan. The number matched (722.315). It seemed like a good donor.

It was without a torque convertor, so we used her existing one — draining it prior to installation, etc.

When we first put the transmission in, it shifted WAY better than the old one ever did — which the friend had for about 10 years. Seemed like great news, and a successful transplant.

Chassis Model Number

W123

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Transmission / Suspension Specific Aid

85 300D Vacuum Shutoff Problem

n/a123 1985 300D Turbow
Tested diesel shuoff valve as per instructions
Pumped up vacuum to 10, but was unable to shutoff engine and the vacuum dropped off rapidly. I did this three times with same results. Removed valve and inspected. It didn't appear to be leaking any oil.
Tested valve and it closed at 5 and held vacuum. Tested three times with same results. Pumped up to 10 and it held all night with no loss of vacuum.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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