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#1
04-14-2006, 01:52 PM
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Hopefully Dead Injector
The 81' 300D died a couple days ago. I put around 500 miles on it over the weekend and it performed perfectly. Then, Wednesday evening getting off of the highway, tons of smoke, loss of power and extreme nailing that increases with RPM's (I think, er hope, its nailing and not a rod).
I talked with DieselGiant and got a few ideas. He's great BTW, I've made several purchases from him, but he didn't know that. He took about a half hour to run through everything with me, that's a guy who truly loves these cars and is willing to help out a guy in need. Anyway, I'm gonna run some diesel purge and hope that its just a funky injector. Does anybody know where I can buy some locally in Denver? I've been searching and calling around and nobody seems to know what I'm talking about. After that, I'm gonna loosen the lines AT THE INJECTORs one by one and try to find the culprit . . . if I can isolate it, then I'll switch that injector with another one and hope the problem travels. If so, I'm gonna order some of those bosio nozzles and give 'em a go. Anybody have any other suggestions or know where to find Diesel Purge locally? Thanks, Eric
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______________________ 1981 300D - {172,000} 1971 220D {Sold to TomJ} 
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#2
04-14-2006, 04:57 PM
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I would like to know what you find just for future reference.
It would be useful to know if the smoke smells of burning motor oil, or unburned diesel. They can look a lot alike, but the smell is very different. Ken300D
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-------------------------- 1982 300D at 351K miles 1984 300SD at 217K miles 1987 300D at 370K miles
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#3
04-14-2006, 06:59 PM
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Sounds like a stuck injector. My friend had his '79 Rabbit diesel do this and it really sounded like the motor had grenaded!! We rebuilt his injector with a new nozzle kit and all was well. Try not to run it too long with the bad injector as it is putting alot of fuel to the cylinder. Do the one line at a time process to find it.
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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#4
04-14-2006, 09:20 PM
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I think its the injector . . .
I couldn't find any diesel purge locally, so I purged it with soybean oil.
While running it, I noticed that injector #1 was loose! I went to pull the steel supply line, and turning that nut turned the entire injector. Simple, I thought, and I pulled the line, put the 27mm deep on the injector and tightened it down, and reconnected the supply line. The knocking was much quieter at idle, though still somewhat dectable, but uneven. With greater revs, it got louder and more frequent. I pulled over and cracked the line going to that injector, and sure enough the knocking stopped. Even with greater RPM's, no knocking. Reconnected that line and the knocking and eneven idle returned. The question now, can I count on it being the injector? I figure I'll order new bosio nozzles now and drop 'em in, but I don't want to spend the money and then discover I had another issue. You folks think this is enough evidence to proceed or is there some more diagnostic work to be done here? Thanks, Eric
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______________________ 1981 300D - {172,000} 1971 220D {Sold to TomJ}
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#5
04-14-2006, 09:24 PM
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Quote:
Pull the #1 injector and pull another injector. Swap injectors and see if the problem follows the injector. If it does, then you can count on it being the injector. But, not before.
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#6
04-15-2006, 01:20 AM
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I second what Brian said... The swap will ck the injector and a different injector in the suspect cylinder will tell you if you have a noisy cylinder. BUT....A cylinder that has run a bad injector could have alot of carbon build-up causing noise. HEY, Life is one big crap shoot
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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.
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#7
04-15-2006, 02:01 AM
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Or it could have seriously damaged the prechamber or piston by peeing a large stream that was also very advanced in timing... I'd hope if swapped that it didn't damage anything in it's new location... Is that an injector knocking, nope, just knocking on wood...
Andrew
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#9
04-15-2006, 12:01 PM
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Conclusive Proof?
Its gotta be . . . I moved suspect injector to cylinder 5 and vice versa. Knocking moved to cylinder 5, and cracking the line at cylinder 5 results in no knocking. Gotta be the injector. A visual examination of the suspect injector showed that the little pin on the end of the nozzle was flush with surface of the nozzle, whereas the good one from #5 extended just a bit . . . I don't know how these injectors are supposed to look, but I'm guessing that's what one looks like when it is stuck open. Both injectors had a pretty good coating of carbon, so I'm guessing the all of the nozzles were due to be replaced anyway.
Man, I can't tell you what a sigh of relief it is to know that the injector is at fault! I'm off to order order my bosios . . . Eric
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______________________ 1981 300D - {172,000} 1971 220D {Sold to TomJ}
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#10
04-15-2006, 12:09 PM
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Quote:
Good job.  Help is what we do here.
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#11
04-15-2006, 12:12 PM
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Thanks
Many thanks to y'all . . . this forum has been invaluable!
Brian, if you ever come through Denver, I owe you a beer. Eric
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______________________ 1981 300D - {172,000} 1971 220D {Sold to TomJ}
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#12
04-15-2006, 12:14 PM
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Quote:
I'm writing that down..........I'll collect on it one day...........  If you get those Bosio nozzles, please follow up on this thread with how they perform. They are somewhat new to all of us and more data is desired. Any accurate  fuel economy data would also be very much appreciated.......before.......and after.
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