I took my two year old "rebuilt" injectors to the Bosch shop to get tested. I noticed a very slight drop in mileage last year, and well now I know why. The pop pressure is fine across all 6, and they won't leak down, but the spray pattern is so so at best. They spray heavy and don't atomize the fuel nearly as well as they should. They hooked up another MB injector that they had just rebuilt to show me the difference, and yep it was a lot better. The guy who tested them said they are not really bad enough to rebuild, but not that great either. He said I should run them for another year and run a lot of cleaners through, to see if that doesn't improve them. If they don't clear up by the fall I'm going to have this local shop do them.

I still regret replacing the originals, they were probably better than these.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

member:

C Sean Watts

sells the Monark injector Nozzles (made in Germany) for about $20.00 USD each.

If it is effecting your fuel milage it sounds cheaper in the long run and for that reason alone to replace the nozzles now. It should also allow for easier starting and less carbon build up; especially until the engine is up to operating temp.

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84 300D, 82 Volvo 244Gl Diesel

What were the "rebuilt" injectors that you put in two years ago?

Source?

I've questioned the "rebuilt" term on these for awhile. It could mean just a dunk in some cleaner..........no nozzle replacement.

Probably another scam.

One person's tuneup can be another person's rebuild. Rule of thumb: always get as much detail as possible.

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'98 E300 DT
'87 190D 2.5 turbo RIP
'92 S500 Sold
'03 3.2TL-S A-Spec

They were ordered from Worldpac, so God knows where they got them from and who "rebuilt" them. I had a heck of a time when I first got them, the car ran like crap and I had to send a few back before getting a good set.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

Yep.........no surprise there. Anybody "rebuilt" them and you paid way too much for it.

Leason learned, just cost me a few hundred to learn it.

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1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

So, What are you guys paying for balancing & pop testing? I just cleaned out a set of injectors, changed a set of nozzles (Thanx Sean! ) and had them balanced and pop tested. And I paid enough for balancing & pop testing, to be reluctant to say

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR

What are the choices: Buy new if you can find them, exchange for rebuilts, have a local shop rebuild them, take a chance on a used set, or rebuild them yourself.
For your 2 models of Mercedes it is possible to by rebuilt injectors off the internet for around $40 each (in the US) if you take the time to search for them. Added to that is the cost to ship them to you and the cost to ship back the old ones (cores) to get the money back for your core charge.
What did you get for that money: A set of injectors that are not as well balanced as the local shop would do and spray nozzles made in an unknown country.
Since the unknown country Bosch spray nozzles alone are selling for around $30 or more each the spray nozzles frim Sean C Watts are a good deal especially since you know what you are getting.
So compare the overall cost (don't forget the shipping) and QUALITY of buying rebuilts off the shelf and paying to have injectors done by the private shop with quality parts and I think you are ahead in the long run.
So lets say you supplied your own spray nozzles and you payed $30-40 each injector for labor (which I think is a little high). The local shop is going to do a better job on them as they know you are local and can come back for warrenty work.
You have to consider it an investment.

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84 300D, 82 Volvo 244Gl Diesel

I was thinking of having this done. The diesel performance guy in that article is right down the street from me. I imgine this was for DI engines and not IDI, but who knows. If the price really is $40 and the increase in performance that tangeable, why not?

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http://superturbodiesel.com/images/sig.04.10.jpg
1995 E420 Schwarz
1995 E300 Weiss
#1987 300D Sturmmachine
#1991 300D Nearly Perfect
#1994 E320 Cabriolet
#1995 E320 Touring
#1985 300D Sedan
OBK #42

Testmaster

BOSCH Service Center

Whoeeee! $36.00 each

(I can borrow,make or buy a tester...And I sure know how to balance and test.)

Your logic is pretty sound. It's an hour drive to go yell at the guy if he did a crappy job but I still have that option so I agree with you about hiring local labour.
I am VERY happy with my transaction with Sean for 265 nozzles. of course I haven't run them yet but I expect no problems with the nozzles they were packed very well and I think are probably a good product.(And a good Price)
I paid nearly $50 each for balancing and pop testing at a Bosch approved shop in Calgary.
I think I will either buy a pop tester off E-bay or make one before I do the other car. If I find I like doing it maybe I'll lay a supply of shims and start doing them for others

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Thanx,
Alberta Luthier
1983 300CD ('Stinky')155k miles, 2.47 diff, EGR removed, AAZ injectors with 265 nozzles from Sean,and vogtland lowering springs.
1984 300SD ('Old Blue')150k Klicks from Japan originally, came with rear head rests, no sunroof and never had an EGR

Alberta Luthier, what shop did you use for injector testing?

I just had my injectors tested at GCL Fuel Systems in Calgary, which is a Bosch authorized shop. They quoted $55 to test four of them (and the quote didn't mention the additional $11 in shop supplies and surcharges that showed up on the final bill). However, they did tell me that they all tested OK and had a good spray pattern and pressure, so I appreciate their honesty. The place was really clean and the staff was friendly.

If rebuilding or cleaning was done, they said it would be about 1/2 hour ($55) per injector to disassemble, lap, seal, and balance if necessary. Fortunately I didn't need to do have this done.

Injector heat shields ($0.96 online) were $6.99 each there. I try hard to support local businesses but I can't when the price difference is that big.

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1989 250TD Wagon 5-speed, 160,000mi ::: Dark gray metallic / black cloth
1984 190D-2.2 5-speed, 287,000mi ::: Silver-blue metallic / black MB-tex ::: SOLD

He's increasing the fuel flow into the piston with his internal polishing of the injectors. You'll get more apparent power, but that's because you'll be putting more fuel in all the time. In other words, won't you just be hitting max load at a different throttle position?

Of course, you'll also get more than stock max load at WOT, so if you then play with the boost, you can get beyond stock HP before needing to diddle around with the max load setting on the IP. Has potential.

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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png

Broadband: more lies faster.