W110 W111 W112 Sedan, BENZ AID - COMMON QUESTIONS AND ANSWERS

300D Vacuum Pictures & 5 way connector

Does anyone have any detailed pictures of the vacuum lines and connectors under the hood of a 1981-1985 300d? I a starting from scratch and the diagrams that I have found don't specify whay types of lines to use and they are vague at best on how to run the lines. Please help! Also I have seen a 5-way connector in some cars and the vacuum connector kit on this site does not include this? When was it used and on what models? I have the vacuum troubleshooting guide but it lacks the detail that I am looking for it this situation. Thanks for any and all the help!

GLIDEHM

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

WVO is exempt in WA

Well I was ready to go back to the Legislature again this year to try to get WVO as a fuel exempted from road use taxes, but I do not have to. Representative Dan Roach's administrative assistant contacted the Department of Licensing or Revenue and was emailed the following response.

Administratively we accept Waste Vegetable Oil as “biodiesel” even though the exemption states: “(k) Waste vegetable oil as defined under RCW 82.08.0205 if the oil is used to manufacture biodiesel.” The manufacturing v. processing to use WVO was not significant and the intent of the law was to exempt the WVO. We do exempt the WVO from tax as long it is for personal use only. The WVO sold as a fuel is subject to tax.

We are exempt for road use tax, that is a wonderful thing.

Forums

SVO Fuel Conversion Specific Aid

Removing heater blower unit from a 190E sedan

I am interested in finding out info on how hard it is to remove an replace the heater blower unit from my 1988ish 190E sedan. I am pretty handy with the tools but want to know how much of a specialistjob it is and if it requires any special tools.

I have already replaced the switching unit and that temporarily fixed the problem. The unit then just packed up and it's getting pretty cold at the moment without it, not to mention a little dangerous having to demist the windscreen manually.

Any info or hints would be greatly appreciated.

cheers

Ozziedave

Forums

Body and Interior Specific Aid

Failure mode for blower motor 300cd

My cars blower was erratic (sometimes it would operate on high, sometimes it would operate on only medium, sometimes it would barely blow) and I thought that either my switch was malfunctioning or the fan motor was going out. It seemed that it might be the motor since even the defrost manual high speed setting was unpredictable. As of yesterday it has stopped all together. Is this the normal failure mode for fan motor or switch?

Chassis Model Number

W123

Forums

Body and Interior Specific Aid

83 300CD no start after fuel filter change

Help!

I just completed a diesel purge on my 1983 CD, I changed both fuel filters. With the secondary fuel filter nut loose, I used the manual fuel pump to remove the air. I have a feeling the pump is not working.... After 15-20 pumps with the manual hand pimp, I tightened the secondary nut. At this stage the primary filter was 1/4 full. I ran the engine, it ran for about 30-40 seconds then died. The primary fuel pump is full. I repeated the air purge procedure again... no success. the engine will not start.

Can you please advise next steps... advanced thanks!

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1985 300D starting problem

My 1985 300D is becoming unreliable in starting. After warming the glow plugs turning the tumbler to "start" will not always engage the starter. Further, sometimes holding the tumbler in the "start" postion will have a noticeable delay in engaging the starter solenoid, if it happens at all. The battery is new and is fully charged. The starter was replaced just a few weeks ago with a new rebuilt Bosch. Is the problem in the tumbler, or is there some other relay that I don't know of?

Forums

Diesel Engine Specific Aid

1983 300d vacuum low ???

My 1983 300d has roughly 12-15 in/Hg of vacuum at idle. It fluctuates very very rapidly between 12 and 15 on the gauge. Does this mean that the check valve and the vacuum pump are bad? When you rev the engine up to 2000-2500 rpms, I get around 20-22 in/Hg and it still fluctuates very rapidly. I am checking the vacuum at the main servo line that runs to the brake booster. Any insight would be greatly appreciated bcs the price of these parts is defintely not cheap. Thanks for the help!!!!!!

GLIDEHM

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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