Diesel Engine Specific Aid

Fixing up 78 240D - where do I start?

Hey everyone, So this is my story and I'll try to keep it as brief as possible. I recently bought a 78 240d though an auction on ebay, pretty much sight unseen. This is my first mercedes, let alone a diesel. The car is pretty solid for what I gave for it, hardly any real serious rust,body is actully real straight, and besides a couple of small items everything seems to work.

Chassis Model Number

W123

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Diesel Engine Specific Aid

DIY Fuel Injector replacement questions

Hi- first posting here ;) How risky is it to install new fuel injectors yourself? I just got the DIY fuel injector kit from this web site (that I trust) and was going to try and install it myself. Before I did, I asked my mechanic, whom I trust, how much it would cost for HIM to install them. Before we even go to the price he informed me that when you replace the injectors, you sometimes have to resand or buff the inner faces of the fuel injector housing thingy (forget what is is exactly - but those things you disassemble and have spring in them to hold the actual little injectors.)

Chassis Model Number

W123

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1981 300D: Valve adjustment = shifting problems

Short story - a rushed valve adjust on a 1981 300D. While moving vacuum box attached to top of valve cover, ALL five vacuum lines became dislodged. And no, I didn't jot down a diagram or take a photo first. So, I put the lines back in as best I could remember, but now the inevitable shifting problems have appeared. Seems fine on level, but not so hot on hills (revs as if slipping intermittently, doesn't shift or downshift correctly some times). All was just fine before the valve adjust. And I can't find any other dislodged lines or cracked lines/connectors. I know little of this, but it seems the positioning of the five vacuum lines leading to the rubber block attached to the valve cover box is critical.

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Chassis Model Number

W123

OM636 circa '85 top end service

Hi guys, I don't plan to take this forum off on a marine tangent but I have just bought a small 1985 motor sailer powered by a marinised Mercedes OM636 which appears to have had very little professional service, ever. Sticking to the similarity of the engine to all the older four cylinder diesel Mercs I am confident that the Fast Start Glow Plug conversion is an immediate requirement as she is a very slow, and then lumpy, starter. My question then is, what special tools (if any) are required to remove and decarbonise the precombustion chambers? Obviously I will have injectors serviced etc but what other matters should I be looking at whilst picking out the black bits? Which of the manuals you have produced will be the most help to me in getting this engine back up to spec?

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84 300SD power steering trouble

howdy. i have an 84 300sd. i have changed and purged the power steering fluid using instructions and filter from mercedes source. when i turn the steering wheel, the car makes a loud squeaky/grating sound. louder as the ends of the turning radius are reached. it's like the oil is not circulating and everything is dry. the reservoir is foamy on top . what's happening? matt

Chassis Model Number

W126

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1980 W123 A/C issues

A/C doesn't work, the DEF is the only switch that works, used a jumper wire & started the compressor, works fine. There is no power at the switches on the dryer & no power at the switches on the CC console, also, the vacuum hose that goes into the 6 point distributor does not hold vacuum, what are some things I can check before taking drastic measures.

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Chassis Model Number

W123

'87 300DT - When To Replace Primer Pump?

I have an '87 300DT sedan, 603.960 engine, 143500 miles. Reading thru my electronic copy of the W124 Service Library concerning the fuel primer pump, it lists the minimum pressures it should be able to achieve at idle and at a certain rpm. Measured at the supply line between the cartridge fuel filter and the inlet to the injection pump, doing the conversion from bar to psi, it looks to indicate that the primer pump should obtain a minimum pressure of 4 1/2 psi at idle. I have an underhood fuel pressure gauge installed (Mr Gasket 15 psi from Advance Auto) in the line specified in the FSM. Initially idling cold, it registers 6 psi. After driving 20 miles to work, idling when hot it registers 5 psi.

Chassis Model Number

W124

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Door Locks 93 300D 2.5

After locking my doors with the key all four lock knobs pop open on there own after about 45-60 sec. I can hear a wirring sound comming from the back seat. I am assuming I have a vacuum leak somewhere or a malfunctioned pump under the back seat. Could the door vacuum actuators be faulty? I am trying to keep this simple at first before I need to take the door panels off. Thanks for your help Mike Stillwater, Minnesota

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Chassis Model Number

W124

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