Its been a busy arvo here in the "HesmadLab".

On our Tuesday ride I was handed some injectors for Blakey by K-Freak. "they wont fire, but you might be able to" so i took up the challenge. I read up on how the injectors work and set about trying to free em up.

I first Numbered the injectors and checked the coils and they all measured in at 16 ohms. Good.

Next i hooked up my trusty power supply and tried to fire em. Nothing, Notta, zilch>>>>>
So I fired up my super youbeat ultrasonic cleaner and gave them a short bath.

After the first short bath i tested each injector and one actuated. set this one aside and put the rest back in the bath and continued with testing and ultrasonics untill they all actuated.

Now a brief trip to youtube to see how people were cleaning the gunk out from the insides. Here is what I found. Use a can of carby cleaner, short lenght of fuel hose and 30ml syringe.


I set up the first injector and pressurised the cleaner and powered up..

Not the best. So gave it a few more after lewtting it stand with cleaner in the injector and ...

Out came a splutter then whoosh!!!
Nice round pattern on bench top..


So now all they need is some new filters/caps/o-rings ect as they are all working nicely on the bench. I am more and more impressed with ultrasonics as a mediem for cleaning small tight places. (thanks OG!!) So if you are coming up on the 7th bring those pieces to clean as I have a fresh bath of cleaner.

I suspect if you wired them up to the previously discussed energiser circuit and had them firing whilst submerged in the ultrasonic bath it would be even more effective at removing the gunk from inside.
Regards,
K-BIKE

nice work there alby .....thumbs up

Wow, thanks for that!
I'll pay for the can of carby cleaner!

Oh man. I have 8 of those sealed up injectors laying here right now. Wish I had access to an ultrasonic cleaner...

Alby,
What liquid was used in the sonic cleaner

Ungass Brulin 815 GD is a standard immersion and ultrasonic detergent cleaner. I used it in its weakest solution. My cleaner has a peak of 500 watts.
K-Bbike i had a look for the timer you mentioned (I remember reading it) but cannot find it. I agree it would be more efficent to have a timer and being able to adjust the duty cycle would give an accurate reading of coils performance if flow rates were measured. Best go pinch the neighbors rain-gauge!

blakey..Its on me, just be here on the 7th!!

The article was about using a 12 volt rectified AC to give a wave form that would fire the injectors open and shut so as to work them. Seeing your article it occurs to me that having them cycling whilst in the ultrasonic bath would help the sonic waves penetrate from both ends.
Regards,
K-BIKE

K-Bike yes . It would help to have the injector open to allow the cavitation process to lift the rubbish from the valve seats. The great thing about ultrasonics is the sound will resonate through the item in the bath. so anywhere there is liquid the cavitation (cleaning process) will occur.

some of the battery chargers are half wave rectified .....good shaking ability of batteries ...and a good operation of injectors i suspect equivalent to 3k ?

Cheers for that, some good info.

Thats a good write up Alby thanks for sharing that.

BIG D

Found this on Oz Fleabay.

I believe this kit will be what I'm after to bring them back to near original...and have a spare set.

Also, on YouTube, there are videos on how to change the filter.

good link blakey, he has all sorts of good things ..

That looks simple enough. Ill go you halves in the kit Blakey. I got four spares i want to clean up.

Nah, my shout for cleaning the injectors.

Bought four K1100 injectors with higher flow to replace the standard ones on my K100. So, I got into cleaning them based on the instructions above. Below, I document the differences:

First, I couldn't get ahold of a syringe that tightly fit the fuel hosing I had lying around so I used a vacuum plug instead.




I cut the hose and press fit a rubber vacuum plug in the end after piercing a hole in the end of the plug with a jeweler's screwdriver so that a spray nozzle was a tight fit. As you can see, the setup works well for spraying carb cleaner through the injectors.


I built a very simple wire to actuate the injector. Lamp cord with one line cut and spliced in a push button switch. I found a Bosch injector connector pigtail by raiding a car at the local junk yard and cutting a connector off its wiring harness. Soldered and shrunk wrapped the connections.


Aso found this simple circuit online which exercises the injectors like professional test instruments. It could be built for $20-$30 in parts. It's overkill for this application however but may be interesting for others here.

Bought an 8 cylinder rebuild kit from Mr. Injector to recondition the replaceable injector parts (therefore I have parts for the K1100 injectors as well as the original K100 injectors). I'll give the injectors an ultrasonic bath in Simple Green solution, replace the parts and spray paint the bodies with heat resistant paint. They'll look and work good as new; and it only cost me $40 for everything including the injectors. Not bad.

nice !!!

I just purchased a fuel injector flow bench and test machine. I am now offering as a service cleaning and testing fuel injectors. I also have in stock new O rings and filters for the BMW injectors. Some people on here have cleaned their own injectors but with out the flow bench you can not be sure if they are working correctly. Also with the ethanol in the fuel some of the old O rings are getting beat up. The new O rings can handle the new fuel additives. Also there is a screen in the top of the injector which over the years gets clogged and can estrict fuel flow thru the injector. If anyone wants more info about my service or just needs replacement O rings and screens let me know.