injector cleaner - Mercedes-Benz Forum

 
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post #1 of 6 (permalink) Old 09-03-2015, 03:03 PM Thread Starter
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injector cleaner

Anyone ever used the mercedessource injector tester/cleaner?
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post #2 of 6 (permalink) Old 09-03-2015, 06:44 PM
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You can use one of these with any injector cleaner and save some money...

Diesel Injector Nozzle Pop Pressure Tester Dual Scale Bar PSI Gauge PS400AI | eBay
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post #3 of 6 (permalink) Old 09-04-2015, 11:10 PM
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I made my own out of pvc pipe. Filling the pipe with what ever cleaner you want. Carb cleaner, Diesel etc It cleaned the injectors really well on my 4.5. I activated the injector with a small 9v battery. I'm not sure how much pressure you would need to clean mechanical injectors? The electronic ones sprayed nicely at 50psi.
Cheers John.
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post #4 of 6 (permalink) Old 09-05-2015, 05:08 PM
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Originally Posted by rumb View Post
Anyone ever used the mercedessource injector tester/cleaner?
Yes. I have one and have used it on the injectors for my 300SE M189 engine. It's really nice.

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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post #5 of 6 (permalink) Old 09-05-2015, 05:30 PM Thread Starter
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Scoot, Can you pls elaborate on your experience? were your injectors spraying bad and did it fix them? I've always wondered about my 300SE with 235K on it whether it needed cleaning. Also I now have the 6.9 that I want to clean. Does your car run better after? I figure if I clean 2 cars worth and it works then it is worth the price of the equipment.

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Yes. I have one and have used it on the injectors for my 300SE M189 engine. It's really nice.

Last edited by rumb; 09-05-2015 at 05:32 PM.
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post #6 of 6 (permalink) Old 09-05-2015, 08:27 PM
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Scoot, Can you pls elaborate on your experience? were your injectors spraying bad and did it fix them? I've always wondered about my 300SE with 235K on it whether it needed cleaning. Also I now have the 6.9 that I want to clean. Does your car run better after? I figure if I clean 2 cars worth and it works then it is worth the price of the equipment.
My situation is a bit different from yours. I'm taking a car that has been not running for 15+ years and resurrecting it. Doing that involved cleaning every aspect of the fuel system from back to front - tank, lines, pump rebuild, cleaning injection pump itself, injector lines, and the injectors and CSV.

In the case of my car yes, it runs better now than before but that's because it didn't run before. Got lots of filth out of every component.

As for the injectors themselves, there are basically 4 states they can be in:
1) clogged/blocked (which mine were)
2) spraying poorly and at too low of pressure (which mine became next)
3) spraying so-so and leaking down in pressure and leaking (which mine didn't do)
4) spraying properly (which mine are now)

I'm not sure it matters whose pop cleaner/tester you use, what is important is to get them un-stuck (if they are stuck) and then to get them to the point where they spray just a little spurt of nicely atomized fuel at around 240 psi. When they are at that state they actually make a little chirp sound. I have 6 chirpers now.

Kent Bergma (MercedesSource) sells a tester that's nice. You can find a cheaper one on ebay either from US or India. Or you can make one - also discussed on this forum and in others. For my money buying the one from MercedesSource was a good choice because a) the cost of the tool is SOOOOO much less than the cost of a single injector and b) I'm happy for Kent to make money on his business.

Your 6.9 probably has K-jetronic which isn't going to have the same type of injector and I don't think you can clean it with this type of device.

I have some pictures and posts regarding cleaning injectors in various forums:

Re: Mechanical Fuel Injector (MFI) Tester and Cleaning Kit

M189 6 piston Injection pump issue - stuff coming out of some of the lines only

Help removing Injectors from M189.986 engine....

MercedesSource has a lot of good youtube videos - I did most everything in Bergma's Resurection of the Beast series in which he is bringing a W109 6.3 back to life... Basically the same process as for a W112 M189...

Scott

Currently: 1967 250 SL, 1963 220Sb, 1965 300SE Lang, 1971 280SE parts car, 1972 Alfa GTV, 1965 Alfa Duetto, 1993 BMW R100R
Past: 1971 250 C, 1985 300 TD, 1967 250 S, 1968 280 S,1981 300 D, 1982 280CE, 3 Facel Vegas, Borgward Isabella Coupe, Alfa 2600 Sprint, Volvo P1900 (yes), numerous less interesting Volvos, ...
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