83 300 sd won't start - PeachParts Mercedes-Benz Forum

adiaw83 · #1 11-27-2002, 12:43 PM

i've been away at school for a while and the car hasn't really been started. When I turn the key i here the engine trying to go put it seems like something just isn't kicking in. I'm pretty sure its not the battery because I just put a new one in this summer. What should i check for?

84300DT · #2 11-27-2002, 05:24 PM

did you try handpriming the injection pump?

billrok · #3 11-27-2002, 07:14 PM

Is the starter turning the engine over quickly? Try charging the battery and then give it a go. Prime fuel rail also. Is the glow plug system functioning properly? Wait several seconds after the glow plug light goes out to crank it over.

Fisherman · #4 11-27-2002, 08:31 PM

If it has been sitting a long time you can try to squirt a few shots of oil in through the glow plug holes.
Let is sit a day and then turn it over with the glow plugs out to get rid of any extra oil. then put in the plugs and start it. The oil helps build compression.
I've never heard anyone say that this is a bad thing to do but maybe someone has some thoughts on this???

can-do · #5 11-28-2002, 11:41 AM

Greetings,

If priming the fuel system with the hand primer doesn't give your engine a kick when trying to crank over, and the glow plug system is working properly, then removing the injectors and squirting some 30-50w oil into the cylinders and reinstalling the injectors should get your compression up enough to get the engine started. After the cloud of burnt oil subsides you probably won't have anymore problems as long as the engine is started and run on a regular basis. Reason being is most likely a tired engine with blowby and reduced compression. It sitting there not being run doesn't help the ring to cylinder wall seating either. Give it try and you'll most likely be up and running in less than half an hour.

Charles

adiaw83 · #6 11-28-2002, 04:29 PM

thanks. i'm not really sure where exaclty these things are though and also what tools do i need to remove the glow plugs?

Paul · #7 11-28-2002, 05:38 PM

do the easiest thing first.if you car has been sitting for a while your battery just may not be cranking fast enough.at 250k your glow plugs can be working fine and you can be getting plenty of fuel, but if it's cranking just alittle to slow it won't start.also if it is cranking too slow and you keep cranking all the fuel being injected into the cylinders will cause a loss of compression then you will have to go through the trouble of a compression boost mentioned above.if you're glowing and you have fuel try a fresh battery first.
paul

adiaw83 · #8 12-23-2002, 01:31 PM

can someone just explain to me how to remove the injectors and manually prime the injection pump. Thanks.

Fisherman · #9 12-23-2002, 01:55 PM

No need to remiove the injectors, in fact probably not something you really want to do anyway.
The primer for your car should be on the side of the injection pump. There will be either a knurled plastic knob that you unscrew and then pump or it wil look like a small plastic button pointing striight up that you just push down on.
in either case pump up and down on the thing until you hear a rattling sound by the large fuel filter. This tells you that you have fuel going through the bypass. if it is the screw type primer remember to screw it back down before firing the engine.
If this does not work then we cn walk you through the process of pulling the glow plugs for the compression build via oil injection...
You might also need to cycle the glow plugs for an extended cycle whcih is when you hear the glow plug relay click off.
Make absolutely certain that the battery is fuly charged as this will be a great help.
Let us know if there is more we can do to help.