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

1984 300D Cruise control issues

Hi all. Hope the New year is being good to everybody. I work this site for all I can and have read every question that pertains to my particular car and have gained so much knowledge. I am grateful to Mercedessource for providing this great data base. That said my question is, that if I set my CC at about 62 mph and around 3000 rpm it works fairly consistant. I say "fairly consistant" as eventually it gets a little jerky. If I don't set it right around those values it runs even more jerky. It surges and then backs off again and again as it tries to compensate for rises and dips in the highway. I have read about the amplifier under the dash and loose ball sockets in the linkages. Has anyone had similar symptons and addressed this specific quirk and what was your experience and outcome.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

85 300TD rear main seal...what else to do?

I changed to 5W-40 synthetic and am now leaking from what appears to be rear main seal. For the sake of my question, let's assume it is (and is not the oil filter to block housing or cooler lines) and assume I take the engine out to fix it. BESIDES the items listed in the transplant guide, are there any "may as well do's" while the engine that has 190Kmiles is out anyway? Compression is 320/320/310/290/300psi COLD and oil pressure at 1.75 bar at 85 degrees C after a hard highway run....is a ring job/crankshaft bearing "cheap rebuild" worth it with those numbers?

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

1975 240D Relocate Battery to Trunk

I need to relocate my battery to the trunk of my 1975 240D so I can install the Electric Fuel Boost Heater close to the injection pump.

I'm trying to install the Electric Fuel Boost Heater. I went through a lot of work making mounting brackets and a plate but in a nutshell it doesn't work. It vibrates too much, and I'm afraid the vibration will danmage the thermostat of the EFBH. I made the mistake of relocating my orginal fuel filter and mounting the EFBH to the fuel filter mount. I think I'm better off to relocate my battery so the EFBH will be attached to the car body and not the engine.

My questions are:

1)Where is the best place to drill a hole in the trunk for the battery cables?

Chassis Model Number

W115

Forums

SVO Fuel Conversion Specific Aid

Mileage Specs 240/300D

What is the manufactures advertised MPG on the 240D and 300D?

Did this vary depending on the model year?

While negotiating the purchase of a 240D with WVO installed the seller said, he had just purchased a 1983 300D that got better fuel mileage per gallon. I thought this odd considering the 240D is a 4 cylinder and the 300D is 5 cylinder. Would use of the WVO system in the 240D somehow cause this to occur or is it more likely something else causing this to occur? Would the vehicle the 240D get better gas mileage if run solely on diesel fuel?

Thanks.

Chassis Model Number

W123

Forums

Diesel Engine Specific Aid

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