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Car Forum / Mercedes-Benz Cars / December 200596 e300d lots of smoke problem
just replaced some o-rings on the top of the injector pump-took it for a test drive and 5 minutes into the test drive I get gobs of smoke. it happened all of a sudden and when it did happen the smoke was so thick that traffic behind me could not be seen! I immediately shut off the engine and coasted to a stop. shut it down for a few minutes, started it back up and ran fine along the two mile route back home. next day, happened again with a twist. was driving along the highway around 60mph and the check oil light comes on-pulled off immediately and the check the level which was nearly 2" above the full mark. not sure if it was picking up oil from the tube but felt confident it was a pretty good oil level reading. kept driving and nearly 10 minutes later the light comes on again-I kept driving and a two minutes later I get gobs of smoke again. immediately shut the engine off and sit for two mintues. tried to crank it over but had lots of trouble - almost as if the timine was off. finally after 40-50 seconds of cranking it starts. the car made the final 15 miles home w/o any problem but I was being gentle on the engine. any ideas on causes or fixes would be greatly appreciated. thank you This problem is impossible to diagnose without a description of which "O" rings you replaced and where. The smoke and the rise of the engine oil level suggests fuel and engine oil are no longer being kept separate and the engine is sometimes running on its lube oil and other times fuel is seeping into the engine's lube oil. A condition guaranteed to put an early end to this diesel engine, and the problem! the o-rings were located on top of the injector pump-part of the 'nozzle' which comes from the injector pump and leads to the injector lines. other than taking off the intake manifold, it was a relatively easy job (after finding the o-rings that is). this smoking or high oil level problem did not present itself before this o-ring job,,, is some sort of diaphragm present which may have burst letting fuel into the engine? thanks. > This problem is impossible to diagnose without a description of which > "O" rings you replaced and where. [quoted text clipped - 4 lines] > engine's lube oil. A condition guaranteed to put an early end to this > diesel engine, and the problem! I'm familiar with the old 617 (early '80s) diesels which have, what appears to be a hold down clamp to secure each high pressure line to the injection pump. That hold down clamp not only keeps the high pressure line in place but also adjusts the injection pulse for that cylinder's injector. Your more modern engine may be different in this respect but I mention it here so you understand that tightening such a hold down clamp may have further implications than first appears. When you changed these high pressure line "O" rings did you delve into the IP at all? The 617 diesels use an engine lubricated IP, there's an oil supply line to their IPs. Your engine may be so too, take a look. If your IP is engine lubricated, which it probably is, any defect in a seal between fuel and lube oil is your engine's problem, IMHO. I can't offer much more help and suggest you take a look at and pose your problem to the DIESEL forum or group on www.mbz.org These diesel owners are knowledgeable and may include a few that own the same model as you do and have hands on experience, for if your engine leaked at these "O" rings, then others also had the problem. > the o-rings were located on top of the injector pump-part of the > 'nozzle' which comes from the injector pump and leads to the injector [quoted text clipped - 14 lines] >> engine's lube oil. A condition guaranteed to put an early end to this >> diesel engine, and the problem! Is is possible that you changed the engine oil at approx the same time as the IP o-rings? It sounds to me as though you may have too much oil in the engine. Don't ask me how I know this....That is the only time that I have ever seen a car look as though it is a destroyer making smoke. Did the engine race during the high smoke event? oddly enough, the engine did race during the high smoke output (~ 50mph on the road). once I felt the rpm's increasing I cut the ignition and coasted to a stop. both times, the car started afterwards without an additional smoking incident. update: I've driving the car 100+ miles over the course of a a few days w/ no additional problems (?!) Even the large amount of white smoke upon startup has decreased-the only thing different is an addition of 1qt of oil to bring the oil level up (fresh oil had been previously been put in). Quite odd that probelms crop up then go away-makes a troubleshooter's job difficult. there was not an oil change at the same time as the o-ring work. thank you, P > >> This problem is impossible to diagnose without a description of which > >> "O" rings you replaced and where. [quoted text clipped - 10 lines] > ever seen a car look as though it is a destroyer making smoke. Did the > engine race during the high smoke event? Maybe a bit of dirt is fallen into the pump when replacing the o-rings, that made a injector pissing . > oddly enough, the engine did race during the high smoke output (~ 50mph > on the road). once I felt the rpm's increasing I cut the ignition and [quoted text clipped - 30 lines] >> ever seen a car look as though it is a destroyer making smoke. Did the >> engine race during the high smoke event? |
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