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#1
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Injectors still pees after nozzle replacement
Hey all,
I cleaned all of my OM617 injectors and replaced the nozzles with Monark's. Here are the pressures: PSI 1: 2050 (previously 1950) 2: 2025 (previously 1950) 3: 2050 (previously 1900) 4: 1700 (previously 1750) 5: 2100 Obviously #4 needs to be shimmed. Some of them started to pee when I first starting pop testing them after the rebuild (I was told this was due to the film on the new injector nozzle by another helpful member) but #5 is what is worrying me. If I hold its pressure at 2100, I can get it to pee a stream directly down and to the side. It DOES NOT happen every time, but I can make it happen after a few tries. From what I read from previous posts, this is okay because this is not how our IP works, and testing should only be done with long strokes from the pop tester. I made sure that there was no debris when reassembling the injectors, and did not remove the pintle from the nozzles. One did fall out, but I lubed it and gently let itself slide into place. Is the peeing of the injector as described a "no go?" What would cause this? Over tightening of the injector halves? I did use a torque wrench but anything goes I guess. Any help is much appreciated.
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1981 Mercedes 300SD - 186k miles 1978 Corvette Pace Car - 21k miles 2006 Mazdaspeed 6 - 56k miles |
#2
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Howdy,
You should try to get your pop pressure witin 25PSI vs. FSM of 50PSI. An analog gauge is tough to use with the needle bouncing around. I suggest a digital gauge. A high end gauge will run a bundle, however, it's worth it. I suggest your clean your nozzles. Even new nozzles "could" have a fine film or even metal like dust. I run mine thru an ultrasonic cleaner where everything is suspended on nails with magnets on the end. They are super strong magnets, (#52), and you would be shocked to see the amount of black dust like stuff. DO NOT MIX UP pintles and bodies. After that, blast them inside and out with air. Then, a drop or two of WD40 and insert the pintle. Then, holding the end of the pintle, spin the nozzle like a bearing. It should spin like crazy on its own. Then, set the nozzel on a flat surface and pull up the pintle about 3/4 of the way. The pintle should ease itself down back into the body all by itself. If the pintle does not ride back down, repeat the process. If that never happens, then you got a problem since that pintle should coast down by gravity. Hope that helps. I hope the Chinese are not making knock off Monarks. They got knock off Bosch which have issues. Poop |
#3
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My Monark's are made in Germany, at least that's what they say. Should I take apart all of them and clean the nozzles, even the ones that are at a decent pop pressure? Can I just soak the nozzles in acetone since I don't have an ultrasonic cleaner, then use a nylon brush?
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1981 Mercedes 300SD - 186k miles 1978 Corvette Pace Car - 21k miles 2006 Mazdaspeed 6 - 56k miles |
#4
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Quote:
As part of the Nozzle testing once you know the Pop pressure you are supposed to bring that pressure up slowly to below 200 psi of the Pop pressure and hold that pressure. At that point you are only alowed X number of drops over X amount of time. If you Nozzle pees out during that test you have an issue with the Nozzle seating area. Not cleaning the Nozzle well and assembling it with those tiny metal particals can drive them into the metal. I also dissagree with the Analog Gauge issue. Commercial Pop/Nozzle Testers came with non-liquid Filled and non-dampend Gauges. Watching the action of that Needle tells you a lot when you know what to look for.
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84 300D, 82 Volvo 244Gl Diesel |
#5
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Injectors still pees after nozzle replacement
So if it pees at its peak pressure every so often it's acceptable? I will try the 200 PSI below peak and will write back. I did not clean the nozzles because I've read many other instructions warning of removing the needle. Could not cleaning the nozzles cause scoring?
__________________
1981 Mercedes 300SD - 186k miles 1978 Corvette Pace Car - 21k miles 2006 Mazdaspeed 6 - 56k miles |
#6
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Quote:
The next issue is that you don't want the Pintle to be dry; especially when you are inserting or moving it. You also don't want your hands or I guess in the case of today Gloves dry. This is easily accomplished by dipping them in Diesel Fuel. You don't want to handle a dry Pintel with your dry bare hands because in theory it can rust due to the Salt in your Sweat. Some People have very corrosive body chemistry and if the handled a dry Steel precision part you can see corroded Finger prints with in a matter of hours on the part. I never used Gloves a work because that sort of thing was not considered normal back then. My hand and the parts were wetted in Diesel Fuel and I never had any corroded parts due to me handling the parts. I don’t think you are going to score up the sides if the Pintle by hand as long as the parts are wet with Diesel Fuel. The big new nozzle cleaning issue is you don't want anything to get between the seating area of the Nozzle Pintel and the outer Nozzle Body. If you have particles in-between them and you torque the Injector Nut down you are squashing the Particles between the outer body and the Pintel and messing with the sealing area where it seats. 2 ways to go with a new peeing Nozzle. Return it to the place you bought it and ask for another Nozzle or put it in an Injector and install it and hope it seats in with use. Maybe pull it and test it several months later and see if the peeing issue improved. Where I worked the Ultrasonic Cleaning Tank was reserved mostly for when we had a Direct Injection Nozzle with one or more plugged Holes in it. New Nozzles were cleaned in Solvent, blow out with filtered compressed Air and the Pintel and Nozzle body were dipped in Diesel Fuel and the put into a Bowel of Diesel Fuel. When it came time to assemble the Nozzle I pulled out the Pintel and again blew out the inside of the Nozzle with filter Compressed air. Dipped it into a separate Bowel of clean Diesel Fuel and dipped the Nozzle Pintel in the same and immediately assembled the Injector. It is much faster to do all of the above then it is to write about it.
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84 300D, 82 Volvo 244Gl Diesel |
#7
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Thanks for that write-up. So peeing at ANY time during pop testing is bad? I held #5 200 PSI below its peak pressure and it did not drip or pee AT ALL. The ONLY time it pees is when I repeatedly test it at its peak pressure, and occasionally it will pee.
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#8
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Quote:
Just out of curiosity how does that particular nozzle do when you pump the Handel one continuous slow stroke past the opening pressure? A really good one with go up to the opening pressure and suddenly pop with a good and no dripping. You will see the gauge needle go up and suddenly fall.
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84 300D, 82 Volvo 244Gl Diesel |
#9
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Turns out this injector is causing a knock. I verified this by loosening the nut at the injector and the knock went away. I've ordered another nozzle in hopes that it resolves the problem, which it should.
__________________
1981 Mercedes 300SD - 186k miles 1978 Corvette Pace Car - 21k miles 2006 Mazdaspeed 6 - 56k miles |
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