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  #16  
Old 06-03-2006, 11:36 PM
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After replacing my 2 nuked prechambers I have started on the injectors in order to solve a rough idle issue. 2 of my injectors had the a$$ beat out of them by the destructed PC fragments. Last night I rebuilt one of them with a Bosio nozzle. 5 min job, idle seems different now but not smoother. I still have the other beat up injector to do and perhaps the others but for now I am running just the 1. No diff in temp but I wouldnt expect that with just 1 replaced. My guess for you is the new injectors are giving a better spray pattern and leading to a more complete and thus hotter burn. You may have had another issue like a bad T-stat lurking that is showing itself now with the new heat load. Thats just my guess. An expert I am not!

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  #17  
Old 06-03-2006, 11:38 PM
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thermostat

Thermostat and coolant and fan clutch all replaced last summer at the same time. Should not have gone bad but could have.
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  #18  
Old 06-04-2006, 07:30 AM
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You will get the best results once you have all of the nozzles replaced with new ones.
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  #19  
Old 06-04-2006, 08:00 PM
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Absolutely!

The results are great!

Look at the video at the end of the pictorial.

http://dieselgiant.com/mercedesinjectornozzlereplace.htm
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  #20  
Old 06-04-2006, 10:25 PM
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Yea, the 1 injector at a time plan is not the most efficient. It is however the most cost effective. This is supposed to be cheap transportation and the list of parts is already extensive. If the 1 injector made a huge difference I would have gone right for the other 3. But since it didnt that tells me 3 new nozzles isnt going to make it smooth either. However, so as not to jack this thread for my own injector woes Ill ask if the overheat issue couldbe a result of air trapped in the system? When you replaced all that cooling system stuff did you burp it?
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  #21  
Old 06-04-2006, 10:46 PM
mattdave
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A few things

Are the new bozzio nozzles CHIP nozzles or to be precise pintal I thought I read some place there not does any one know for sure? If one of your remanufactured nozzles nails something is wrong with it and you need to send it back to tom there are some simple OOPS that can cause this when remanufacturing used nozzles. Bosch warns against lapping the nozzles to restore there spray pattern. I thought this was because it would increase the amount of fuel injected causing heat issues. I did a small test where I installed one injector that popped at 1 bar 3 others that I think were popping at about 70bar and the fifth I left alone. While I did not get to put many miles on the car like that, it ran fine no loss of power no smoking no idea of fuel economy though or if fuel was fouling the oil. I picked the absolute worst injectors for this car they all just peed a stream of fluid. I find a lot of injectors from wrecked cars from pic-n-pull that are missing parts, assembled wrong or incorrect injectors for the car as verified by an injection tester that I am now of the opinion that injector problems are so over rated if they don’t nail there probably fine. I have another car engine that I can risk toasting and if the bozzio nozzles are not CHIP nozzles. Then I am interested in running some quantifiable test between a set of balanced NOS BOSCH injectors and these new Bozzio nozzles to see if there as good as the BOSCH injectors, so bad you can budget a new engine rebuild with in a year or somewhere in between. So are they CHIP nozzles or something else?
MJS DHS
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  #22  
Old 06-05-2006, 09:56 AM
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Cant say Im supirsed by those findings. I cant recall a post where someone had a major idle issue or any other major engine complaint for that matter where injectors was the sole solution. Injectors that dont nail seem to be a question of efficiency. A good injector is more efficient but a bad injector doesnt really seem to effect the engine that much. The exception to this would be nailing. I had major nailing with the bad injector and broken PC. Now, the nailing is gone with 2 new pc, 1 new nozzle and 3 unknown nozzles. Still shakes like a pig in gear at low idle.
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  #23  
Old 06-05-2006, 10:08 AM
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Are you sure you know nailing when you hear it? An engine with clean injectors will have more diesel klatta, it is supposed to sound that way. An engine with leaky injectors will nail because fuel is present at the wrong time.
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  #24  
Old 06-05-2006, 11:14 AM
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Nailing doesnt sound anything like the normal diesel sound. It sounds more like a rod knock would sound in a gasser. Even the klatta sound with new injectors isnt like nailing. A shattered PC and an injector that has had the nozzle beaten to death makes a nice example of the nailing sound
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  #25  
Old 06-05-2006, 12:22 PM
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NA injectors pop at 115 bar and, while Turbo at 135. Swapping could definitely lead to what amounts to a timing issue. 115 bar nozzles would open too soon on a turbo model under boost, and likewise 135 would open too late on a Naturally Aspirated engine. Could definitely explain knocking/nailing.
Ben
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  #26  
Old 06-08-2006, 10:37 PM
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Quote:
Originally Posted by mattdave
I have another car engine that I can risk toasting and if the bozzio nozzles are not CHIP nozzles. Then I am interested in running some quantifiable test between a set of balanced NOS BOSCH injectors and these new Bozzio nozzles to see if there as good as the BOSCH injectors, so bad you can budget a new engine rebuild with in a year or somewhere in between. So are they CHIP nozzles or something else?
MJS DHS

This may be a silly question, but what is a "CHIP" nozzle?

Hard to follow the rest of this post.
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  #27  
Old 06-09-2006, 09:00 AM
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Problem resolved

The problem was a radiator that was leaking in the tank on the bottom part of the radiator. I was not losing coolant, but when the system was pressure tested, that showed up. The thermostat the dealer put in last summer was also defective.

Replaced Thermostat, radiator, and water pump. Overheating problem solved.

I am getting a rough shaking idle with the rebuilt injectors I did not have with my old set. I have more power but bad idle shake that was not there before.
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  #28  
Old 06-09-2006, 09:02 AM
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nailing

I know what nailing sounds like and one of the rebuilt injectors WAS nailing. When you cracked the line, it quit immediately. Nailing is a pronounced banging sound.

I pulled that injector out and put one of my old ones back for the time being.
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  #29  
Old 06-10-2006, 10:41 PM
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You need to replace all of your nozzles at once, not just one or two of them.
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  #30  
Old 06-13-2006, 12:25 AM
mattdave
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Chip

Quote:
Originally Posted by KERMA
This may be a silly question, but what is a "CHIP" nozzle?
KERMA it was I who was silly not explain the acronym
In or around 1978 MBZ changed to the newer center hole in the pintal nozzle, called a CHIP (CENTER HOLE IN PINTAL) Injector. The valve that turns the fuel on or off for each injection cycle. Is so much more complex than just a simple on or off (open or closed) valve There are complex variables built into the injector as well as the fuel pump while not rocket science it is something you need a teacher to spend hands on lab time teaching some of the minutia. Just reading a book no matter how smart a fellow you are just will not suffice for experienced hands on person showing you the ropes A person with a real aptitude may pick it up in an hour but with out an experienced hand showing him the way he will likely do it wrong for 30 years. Thanks for the link to there site I have asked them directly what typ of injector pintal they use.
Dave S


Last edited by Brian Carlton; 06-13-2006 at 10:24 AM.
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