At my wit's end ( 300D suddenly doesn't want to start )
This would be a OM617.
She 's been regular as clockwork all winter, had replaced the fuel lines, filters and glow plugs, starting up in all temperatures no problem. Then the other morning, I almost flattened a battery trying to get her to go, nothing. Checked full, injectors out of the block, but still connected to the injection pump, squirt x 5. Glow plugs, could see their glow reflected in the tappet cover when I had the injectors out. Tappets, just did them, one exhaust was all the way down, 0.25, and they were all way too tight, but still. Why no start, all of a sudden. Contamination of the fuel is the only thing I haven't ruled out yet, as far as air/fuel/glow is concerned. Maybe someone spiked her with something ( no locking fuel cap ). Injection pump lost it's timing somehow ? Compression suddenly isn't enough, highly unlikely, but will check the compression next week anyway. Tow start on the horizon, but what could have possible gone wrong ? |
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This procedure will not only test for contamination, but also tank strainer clogging, primary fuel filter clogging etc. |
Thoughts:
1. If I understand correctly, you mean that you JUST did the valves before this problem started? Are you sure you didn't mix up exhaust vs. intake when adjusting the clearances? Lots of people have done that. 2. Check for blockage in the air intake. 3. Seeing a reflected glow doesn't tell you that the glowplugs are glowing hot enough. How old are they? |
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... and, yep, mach4, that was my plan of action regarding checking for contaminated fuel. |
Did you fill up at a different place from normal recently? (If so fuel seems more and more likely)
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Hmmmmmmmmmmmmmmmmmm. Yep, I'll be eliminating the fuel possibility as soon as possible. |
Check the fuse on the glowplugs and check for voltage at the plugs. 99% of no-start conditions are glowplug related.
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.... just ran down two more batteries trying to start the thing off a siphon feed with clean diesel. Compression test is the next step, I guess ( yes, I have already been pricing secondhand engines ) and a tow start. Although why the compression would suddenly disappear on a perfectly * functioning engine is beyond me. * Ok, black smoke, burning oil, but no starting problems whatsoever. |
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I know you said you checked for fuel at the injectors previously... but are you seeing/smelling unburned fuel coming out the exhaust now?
With cranking it for that long, I would expect to see clouds of it out the back end.... Have you tried having someone work the primer pump as you crank? Did you by any chance add anything to the fuel at the last fillup, fuel system cleaner, etc.? |
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Generally speaking engines don't suddenly die like this unless there's something obvious like drastic oil loss / vacuum pump exploding its bits into the timing chain etc etc etc
Have you checked daft things like 1) the accelerator linkage? 2) fast idle knob / stop lever stuck / messing you about? 3) tried starting the car with the vacuum shutdown pipe disconnected? (Don't forget to put it back after starting!) |
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Was really hoping that it would have been something simple like that, but the injectors sprayed on to the motor when I had them externally connected, which sort of rules out those factors. The troubleshooting on this one has been a succession of "damn, that's working", "damn, that's working as well". |
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