20 Most Recent 1990 Mercedes-Benz 300 Diesel - Page 4 Questions & Answers

the oil filter of m103 engine located an the left back of the engine

cylinder 6

you will see the black plastic can, that's it.

Try this link.

hello,yes you have a 6 cylinder petrol engine,engine 103 have a tensioning device,it has a torsional torque to keep constantly in tension,no need to adjust,if your belt is loose,maybe your tensioning device need tobe check,ty

Your '90 Benz has a belt tensioner that is automatic. You just insert the correct tool to ease the tensioner pulley, (The tool is inserted into the bracket for the tensioner pulley), to the left as you're facing the car. Then slip your serpentine belt off. Reinstallation is a reversal of this process. (I believe it's to the left, don't quote me on that)

The radiator support in front, should have a diagram of how the serpentine belt goes on the pulleys.

If your serpentine belt slips, then the belt tensioner pulley assembly is bad, needs to be replaced, or the serpentine belt itself is worn out.

fan thermocouple you can remove it from the fan by 4 bolts in the of it.

try removing the belly plate ,sump guard or whatever else you want to call it but it does have one on the side of the sump and its recessed if i remember rightly with an allen key head

change the switch in the top back of the injector pump ,it has one wire running to it and should be at the back of the pump where the fuel line goes into pump housing

Only thing is Diesels dont use spark ignition. Most reasons for failure of diesels to start is in the glow plug system. Usually just replacement of all glow plugs is sufficient but could be deeper. If you know what your doing you can give a small spritz of starting fluid in the air cleaner and it will start and stay running usually proving a glow plug problem. But please be warned a small spritz. Too much ether can damage a diesel engine. Hope I helped. Thanks

hi,remove black plastic cover near the handle,then you can see one screw,remove,door lock plastic cover,remove,cover for side mirror cover remove ,then lift the whole panelling,ty

hello there

You need to spray WD 40 all around the wire and leave overnight you should be able to pull off the wire, always works for me.

Hope this helps. Please don't forget to rate me.

Thanks

Even if the battery cables look new , take them off and use a wire brush to clean them, battery post or mount too! a battery can have a clear gel film on its contacts that you can not see but will prevent a full 12v from reaching the starter, just clean both pos and neg parts that connect to the battery well and you will see.

glow plugs are probably bad

solved the problem

stick 1/2 inch drive ratchet into the square hole in tensioner

I know it's a little large, but here's the belt routing diagram you are looking for. Hope it helps!

This particular problem is referred to as "Dieseling" actually. Older carbureted vehicles do it quite often. Usually it is caused from the vehicle actually receiving too much fuel and running rich enough to keep the vehicle operating after the ignition is shut off. On a diesel motor, there are actually no spark plugs, the mere compression of the cylinder causes the igniting of the fuel. So my guess would be is that the motor is running rich, for whatever reason. I honestly doubt it is a vacuum leak, however I wouldn't rule out that possibility completely

You may remove alternator pulley and replace with belt over it.

most of time the antena power is blue coming from radio, locate the one in the car going to antena and conect the blue antena wire to it

Fuse block is under the hood, See diagram http://ww2.justanswer.com/uploads/rmillerphd/2008-05-04_113932_A1.pdf