Good info diesel911. Thanks for that post.

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Only diesels in this driveway.
2005 E320 CDI 243k Black/Black
2008 Chevy 3500HD Duramax 340k
2004 Chevy 2500HD Duramax 220k

I drove close to 400 highway miles today and it seemed to be quite a bit more quite at idle. I will continue to monitor. The mileage seems like it might be up as I am at a little over 300 miles at half a tank. Will see how it ends up calculating out.

I put Bosios on my 1985 which I bought for a song 14 years ago. It idled unevenly, started hard, smoked and got about 24 mpg. I set the pump timing, put in new glow plugs and replaced the worn out bosch nozzles with new Bosios.I balanced them and had a big improvement. 30-32 mpg and smoother idle, much improved improved power and no smoke. .compression was about 360 straight across. I had never gotten over 30 mpg with all the W123 's I''d owned before and I didn't notice any significant increase in noise. I was thrilled. The Bosio 85 still runs flawlessly after 20000 miles. A few years back I acquired a 1984 wagon which rocked at idle and smoked a little. I couldn't find Bosio nozzles any more and just did the same jobs as I did on my 85. I balanced the stock boschs and had a good spray pattern. Now it runs perfectly without smoke but has less economy(27-28) and less power than my Bosio nozzled 85. I would love to find a set of Bosios but the stock nozzles are just fine so why bother to get perhaps a bit more economy. With diesel $6/gallon and gas $4 I ve gone back to driving my old Corolla which gets 40-45 mpg. The days of driving our lovely old and heavy w123's may be numbered.

From what I can tell, the last couple of tanks I got 32 on one, 29 on the next, and 34 on the 3rd. Will see what a few more tanks do but economy does seem to be up. Noise seems to remain about the same though. After driving 70-75 for a while on the highway they quiet down but just shorter drives without working the engine some a couple of them seem to be loud still. Might run a can of diesel purge thru it just to see what happens.

Cool.

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84 300D, 82 Volvo 244Gl Diesel

It takes a while for the nozzles to get as quiet as they will for the long-term. In the current situation of nozzle brand choices getting lesser and lesser, quality manufacturing for these parts is hard to find and all the Bosio nozzle I've installed were excellent. Some 60x engines are much more "clackity" than others, checking other things before you blame nozzles that are good by the consensus of basically everyone else would be wise. I've built 100+ sets for 61x and 60x engines and WISH I could still buy Bosios for the older engines - can't find them anywhere since about a year ago.

If you have no previous experience with the place you had do the injectors, it doesn't matter if they're MB certified gold-standard trained by the original employees from 19-whatever - their work is open to question.

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".

Bosch certified does not mean the people in the shop are Bosch trained.

When I started working my first diesel mechanics job which was in a fuel injection shop rebuilding Injectors is the first thing you are shown how to do because it is fast to show you and they can state making money off you fast.

If you have moderate intelligence, they only have to show you how to do a few complete from teardown to finished injectors to teach you. What takes time is telling if the spray pattern is good or not.

You often end up with some nozzles having a only marginally good spray pattern even with new Bosch nozzles.

The other test you bring the injector up to 200 psi before the opening pressure is reached and X number of drops are allowed to weep out drops and it is still considered good nozzle.
You go to your boss and say you have a couple of nozzles that are X+ drops meaning if you are strict the nozzles did not pass. And the Boss may take a look but normally you are going to hear that the Customer wants their Injectors back so that they can resume making money off of their equipment. And those deficient nozzles go to the customer.

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84 300D, 82 Volvo 244Gl Diesel

Exactly. Thank you. Gives me more insight into how the "professionals" do this process, also - I've just learned by trial, error, and observation over time.

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'82 300CD
"Pearl", the very first turbo diesel 123 coupe
Totaled 11/23/18, rebuild in progress.
'85 300TD, "Artemis".
'78 300D euro, "Ol' Red", mostly retired.
'85 300D, "Gandalf".