Pictorial on installing the Bosio injector nozzles - PeachParts Mercedes-Benz Forum

Diesel Giant · #1 04-01-2006, 05:48 PM

I just finished up the pictorial on installing the Bosio injector nozzles.

http://dieselgiant.com/mercedesinjectornozzlereplace.htm

I don't want to spoil the suprise, but WOW its a different car! Super smooth idle and almost no smoke at cold start-up. Just a light touch of smoke on heavy revs and NO SMOKE at warm idle. I did not know an Mercedes diesel would do this with 217k on the clock.

I am doing a long term driving test on the Bosio nozzles so I can give you all some real world driving impressions.

rwthomas1 · #2 04-01-2006, 06:10 PM

Um yeah. And everyone here will tell you that MB injectors never need rebuilding, etc. even after hundreds of thousands of miles..... Congratulations on seeing the light. Nice job. Its always a thrill when a project pays off. RT

Diesel Giant · #3 04-01-2006, 06:13 PM

Quote:

Originally Posted by rwthomas1

Um yeah. And everyone here will tell you that MB injectors never need rebuilding, etc. even after hundreds of thousands of miles..... Congratulations on seeing the light. Nice job. Its always a thrill when a project pays off. RT

Who says they don't ever need rebuilding? On the contrary, MB injectors are some of the weakest as far as lonjevity I have ever seen. The injectors in the Cummins are some of the most robust that I have seen.

bgkast · #4 04-01-2006, 06:18 PM

Nice article. What is the price of the new nozzles? I thought an injector pop test or some other specialized test was needed when doing this job? Thanks.

rwthomas1 · #5 04-01-2006, 06:19 PM

I've been hanging around here awhile and numerous times have seen posts stating that injectors don't need to be touched unless you have having a problem. The issue is that most don't realize that they are having a problem as injectors wear so slowly the performance decrease is not noticed or the car was bought used with 200K on the odo and the owner just thinks that MB's are supposed to run that way. I am an advocate of changing injectors every 100K. Now that there is a source for good nozzles we are in business. RT

Diesel Giant · #6 04-01-2006, 06:24 PM

Changing the nozzles not the injectors is what is needed. The nozzles are the business end of the injector and is what wears and degrades performance.

thorsen · #7 04-01-2006, 07:20 PM

Diesel Giant - Do you offer an injector rebuilding service?

Zackb911 · #8 04-01-2006, 07:28 PM

DG- Nice write up did you pop test them at all or is pressure varitation usually attributed to old nozzles?

Biodiesel300TD · #9 04-01-2006, 07:49 PM

Nice work DG!!

Are the Bosio nozzles supposed to be better than Bosch nozzles?

Now a dumb question: I assume the nozzles are what control the spray pattern, yes?

guage · #10 04-01-2006, 08:03 PM

Another excellent write up & pic's from DG again.
Thanks

dannym · #11 04-01-2006, 08:20 PM

Another great writeup and contribution to the scene.

2 comments:

It's just as good to use corn oil during assembly

And why did you warn against disassembling the injector? There is a freedom of movement test that should be done on all injectors.
The full writeup can be found here:

http://skinnerbox.steaky.org/Service/W123/w123CD2/Program/Engine/617/07_1-137.pdf

Eng,
This is the original thread:
http://www.peachparts.com/shopforum/showthread.php?t=145151&highlight=italian+injectors

Danny

Diesel Giant · #12 04-01-2006, 09:04 PM

Yes I am going to offer a turnaround service that will include disassembly, pop test and balance and nozzle install.

I warn about disassembly because the average person may not really need to take the risk on loosing parts or improper installation. Some can do it others may not be able to handle it. On a junk injector I had that I was messing with, I lost a part out of it in a split second. If that was someones car that needed to be operational, then they would be in a peck of trouble.

Just trying to keep it simple for the masses.

The Bosio nozzles are MUCH better than the Bosch. The Bosch are made either in Turkey, India or China. You dont want the most important part of the injector substandard. Hopefully Bosch will put out a nozzle as good as the older German made units of decades past, but in my opinion the Bosio's are better than the Bosch's ever were.

Austin85 · #13 04-01-2006, 09:58 PM

Quote:

Originally Posted by bgkast

Nice article. What is the price of the new nozzles? I thought an injector pop test or some other specialized test was needed when doing this job? Thanks.

A quick google search and they are less expensive than I thought.

http://www.kermatdi.com/servlet/the-41/Mercedes-OM-dsh-616%2C--dsh-617-nozzle/Detail

DG I may even try this during the summer. BTW WHat tool do you use to tighten properly to 70-80 NM's??

I am still waiting for the Dash Removal pictorial on a W123...(-:

Diesel Giant · #14 04-01-2006, 10:01 PM

Quote:

Originally Posted by bgkast

Nice article. What is the price of the new nozzles? I thought an injector pop test or some other specialized test was needed when doing this job? Thanks.

The nozzles run $29.50 each and for the month of April the shipping is free. Send me an email or go to the dieselgiant.com site to order them.

No you dont need a pop tester to replace the nozzles. If you want to do a balance and adjust the pressure, then yes you would need the equipment. But just cleaning and changing the nozzles, you do not need any special tools or equipment.

rwthomas1 · #15 04-01-2006, 11:33 PM

To better clarify my point... IMHO the injectors need to have new nozzles AND have the pop pressure set. Thats why I say just change injectors. Have a reputable diesel pump shop install the new nozzles and set the pop/balance the set. A correctly setup matched set of injectors is yet another quantum leap forward in engine smoothness and performance. This is beyond the skills of most DIY'ers. I just farm the work out. Of course the new nozzles make a huge difference but since you have the injectors out and have purchased new nozzles you might as well have them popped and balanced too. RT