Are OM617 injectors universal? - PeachParts Mercedes-Benz Forum

AwfulMechanic · #1 07-30-2013, 03:55 PM

Swap from 78' Non-turbo to 84' Turbo? My neighbor is an old diesel mechanic and kindly rebuilt the 78's injectors. Can I do the old switcharoo?

Mölyapina · #2 07-30-2013, 04:13 PM

Unfortunately, the turbo injectors are stronger than the non-turbo injectors due to the higher pressures the turbo generates in the cylinders, and so non-turbo injectors won't work in a turbo.

DieselPaul · #3 07-30-2013, 04:22 PM

They have different cracking pressures, but as far as I know the bodies are the same and the nozzles the same. They won't run right because of the different springs and shims in them.

The body of the NA injector isn't "weaker"

AwfulMechanic · #4 07-30-2013, 04:29 PM

Ah! Dang. The 78' runs great, but the rest of the car is falling apart. Well this is a good excuse for new nozzles. What do you guys recommend? Bosio or Monark?

cooljjay · #5 07-30-2013, 04:44 PM

Did you get another Mercedes? Last I heard you were working on getting a good head for the 78...gave up on it?

Oh and what I have read, its not a good idea to just switch nozzles...the injectors really need to be sent off for balancing, pressure testing and I believe it was lapping....with out the proper equipment its hard to know if the springs are good and if you need different shims..

AwfulMechanic · #6 07-30-2013, 04:56 PM

Quote:

Originally Posted by cooljjay

Did you get another Mercedes? Last I heard you were working on getting a good head for the 78...gave up on it?

I got it all put back together, it starts quickly, has virtually zero blow-by and runs very smooth. I covered the basics to make it a running, safe vehicle, but its just not worth it. It just came down to I could throw money at that car for 10 years and it would still be "meh". Do it regret it? Not a second. I learned a mind blowing amount rebuilding that car. I've never done anything at all like this at all so it was really worth its weight in gold. Plus now I know how to work on the new one without royally screwing up haha.

I found an almost mint 84' for $3,000 and jumped on it. 1984 300D - Imgur

cooljjay · #7 07-30-2013, 05:37 PM

That's a bummer, but I am glad you learned when to throw in the towel. I love the new one, the exterior paint is gorgeous....never been a fan of palomino interior...you should looking in to getting some vinyl die to fix the pink color....are you going to keep the 78 or part it out? That 84 is very nice, specially the not cracked dash and turbo! As long as you keep up the maintenance and implement everything you have learned....this one should last your lifetime...

Diesel911 · #8 07-30-2013, 06:07 PM

Quote:

Originally Posted by AwfulMechanic

Ah! Dang. The 78' runs great, but the rest of the car is falling apart. Well this is a good excuse for new nozzles. What do you guys recommend? Bosio or Monark?

The opening/Pop Pressure is higher on the Turbo Diesels.

Also the Early Bosch Nozzles with the drilled Passages in the Pintle ends had small diameter Holes in them and after a certain date that was changed. So it would be better not to have small hole and large hole Nozzles mixed in the same set.

The reason to use the Bosio or Monark Nozzles can be cost in the case of the Monark Nozzles and the fact that the New Bosch Nozzles for the 617/616 Engines are made in India and as far as I know still have issues of longevity and sometimes right out of the Box.

There is all kinds of Injector and Injector Nozzle info below; Hunter spent considerable time organizing them in the Threads in categories so they would be easier to find:
DIY Repair Links
http://www.peachparts.com/shopforum/forumdisplay.php?f=82
http://www.peachparts.com/Wikka/DoItYourSelf

cooljjay · #9 07-30-2013, 06:23 PM

Quote:

Originally Posted by Diesel911

New Bosch Nozzles for the 617/616 Engines are made in India and as far as I know still have issues of longevity and sometimes right out of the Box.

Sadly I had to use Bosch injectors in my car, like 2 years ago because monark nozzles were no longer being made and no one had any. So far the car runs and gets good mpg....but the idle seems to keep getting rougher...I imagine its because of the injectors but my blow by is so bad that I refuse to sink money into more new injectors....I need to check timing chain stretch and readjust the timing....that may help... But in my case I haven't had any real bad issues with the nozzles..

Phillytwotank · #10 07-30-2013, 06:49 PM

Hollar at Greazzer. He'll hook you up. Great work good price.

ROLLGUY · #11 07-30-2013, 10:23 PM

Quote:

Originally Posted by AwfulMechanic

I found an almost mint 84' for $3,000 and jumped on it. 1984 300D - Imgur

I'd say you stole that car! Very nice well kept car. I have the exact car (well not exactly)- same year, color inside and out. That is where the similarities end. Mine is now a parts car, but I can now see what it looked like when it was new!

charmalu · #12 07-30-2013, 11:05 PM

Your 84 is beautiful, you scored on that one. I would have the 78 and 84 in the barn in bad weather and drive the Honda, those are a dime a dozen.

Charlie

300D85 · #13 06-03-2021, 04:26 PM

can a om617 injector be modded to work with a turbo engine?

ROLLGUY · #14 06-03-2021, 05:26 PM

Quote:

Originally Posted by 300D85

can a om617 injector be modded to work with a turbo engine?

The injectors for N/A and turbo OM617 look the same, but their "pop pressure" is different. The N/A injectors are set at 115 bar, whereas the turbo injectors are set at 135 bar. The OM615/6 use the same 115 bar injectors. An injector previously set for 115 bar can be reset (shimmed) to pop at 135 bar, or the other way around. I think this answers your question......Rich

Clemson88 · #15 06-04-2021, 08:52 PM

Quote:

Originally Posted by 300D85

can a om617 injector be modded to work with a turbo engine?

I also am of the belief that shimming the spring inside the injectors will modify them to the standard for the turbo engine. I suggest anyone who doubts that might seek assurance by comparing the part numbers on OEM nozzles. I probably would do that if I had a set of well functioning injectors from a non turbo 617.