Pagoda SL Group
W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: TheEngineer on February 06, 2017, 04:01:00
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In the workshop manual there is pump mentioned to test injector nozzles: It has a lever and a pressure gauge. The opening pressure is supposed to be 270 to 280 PSI and the spray pattern is to be a fine mist at about a 60 degree cone angle. It also can test for leakage and dribbles. Does anyone have a P/N for it? Pictures? Has anyone built one? Attached is Joe's rig to help you guys become creative. I could use some help here. An engineering drawing by Mercedes?
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Hi Pete,
we discussed some possibilities here: https://www.sl113.org/forums/index.php?topic=18284.msg157339#msg157339
Don't miss this viedo: http://youtu.be/Fb3fHKiVF4o
This company sells a large variety of testers: http://stores.ebay.com/Diesel-Injection-Test-Equipment/Injector-Nozzle-Pop-Testers-/_i.html?_fsub=5999915015&_sid=1006265545&_trksid=p4634.c0.m322
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Kent Bergsma, who produced the video Alfred posted, also sells injector tester kits.
Could we set up a similar "deal" to the hubcap painting stencil, where the Group purchases a test kit that is then passed from member to member? Given the cost maybe we need to charge a deposit or such, but it occurs to me the vast majority of the members would not have a permanent use for such a set-up, but I bet everyone would like to check their injectors at least once.
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I have the AG precision tester which is a copy of the Bosch one (The element and return check are stamped Bosch) that you most likely saw a picture of. The 6000# range on the gauge is far too high for the gas injectors so I swapped the gauge for a 500# one. The one Kent sells and most of the ebay ones are modified hydraulic jacks and I assume there is a youtube video for that. The AG precision on ships from India but I don't remember it being more than a couple weeks lead time. Your local diesel injection shop can run them but may not not be able to give you opening pressure due to a high range gauge on their unit.
If you just want to get them cleaned and checked I am more than happy to run them if you send them to me.
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I have the testing pump, gauge, and cleaning kit I purchased from MercedesSource (Kent Burgsma) about 2 years ago. It works great and ultimately helped me figure out that my injectors (3 of them) were in poor condition. It was definately worth the cost. I also used it to back flush a used injection pump I bought off of e-bay a while back. I would be happy to lend it to anyone local to San Diego or bring your injectors on over and we can test and clean them. Shipping it around could be an issue as it tends to leak out fluid and its almost impossible to get it completely empty. I once had a package impounded by the USPS because it was leaking motor oil.
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Yes, Tyler, this is why I think it is not such a good idea to have a tester available for the Pagoda Group and loan it out to the members. There is also the "not my boat" syndrome. I have loaned tools to "friends" but I ask for a deposit: not money, but something like their Rolex watch. I did build a compression tester for a diesel and it has a 600 PSI gauge, a valve that holds the reading and a valve that bleeds-off the pressure after reading. What I need is the little pressure pump you see on all the hydraulic jacks. I am dreaming about buying a small two ton jack and cut the top off, use the bottom for reservoir and the pump outlet to pressurize the injector to be tested. I also have a promise from Seattle injector to test my injectors for free (Ha-ha), but then I was a good customer there at one time. If I look around some, people may give me some good ideas.
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I bought mine from a fellow forum member and it was wrapped up in sealed plastic bags but the thing leaked and the cardboard was completely saturated with fuel and was placed in a separate plastic bag by the post office and there were nasty words written on it by some post office official. The plastic bag was opened and the box was opened as there was a saturated inspection sticker inside notifying me that shipping flammable fuel product was prohibited. I guess the Canadian people took pity on me as the bag was resealed and I received it all in good nick.
Its a great conversation starter sitting in my garage though.
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You are so lucky that you are in Canada! Here, in Yankee-Land, they would have called HomeSecurity, confiscated the package and detonated it in a secure facility by remote control. Then they would have sent you an invoice and filed a lawsuit against you in Federal Court. If you were black, you would have been arrested and charged with Interstate Shipping of explosive/flammable devices/liquids.
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It is exactly that. It's a modified bottle jack. A hole was drilled into the side and a fitting welded on to attach the plastic reservoir. (The external reservoir is necessary because if the volume of fluid needed to clean the injectors) Then a gage and T fitting with a diesel injector hard pipe was installed in the top where the piston would normally be.
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You are so lucky that you are in Canada...they would have called HomeSecurity, confiscated the package and detonated it in a secure facility by remote control. Then they would have sent you an invoice and filed a lawsuit against you in Federal Court. If you were black, you would have been arrested and charged with Interstate Shipping of explosive/flammable devices/liquids.
...and rightfully so, might I add! Much smaller things have brought down airplanes, and wreaked havoc where it isn't and wasn't intended. Shame on the person who shipped such a device that wasn't completely and properly drained of fluid. It's a good thing nobody was hurt regardless of USA or Canada. What were they thinking?
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I think that the problem occurred when the package was inspected by our own Canadian customs people as the pump was wrapped up very nicely by the sender and expect that the wrapping was cut during the inspection on this side of the border. A car guy I know said that they wouldn't have resealed the package if it was leaking prior to the inspection.
I absolutely do not fault the sender - he is after all one of us.
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I have one like this and works great. http://www.ebay.com/itm/AG-Precision-Diesel-Injector-Nozzle-Pop-Pressure-Tester-Dual-Scale-Gauge-/321126672878
I switched out gauges to something in a lower range. There are lots of these available and should be able to find one with a lower PSI for our gas injectors.
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This is the one I purchased for Mercedes Source. It comes with the correct gauge and correct fitting for our injectors. Also some clear tubing, paper filters, baggies, and gloves. He sells additional parts for it as well for cross platform. (If you have another car thats a Diesel or CIS)
https://mercedessource.com/store/bosch-mechanical-fuel-injector-mfi-tester-and-cleaning-kit
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Just came from Seattle Injector. They tested 12 nozzles and 8 were good. So I'm good!
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Good news for what could have been an $800 day.
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I purchased a tester on eBay and am waiting for it. How do you keep the injector valve open to back flush it? I haven't taken my injectors out yet to look at them. Maybe it's self explanatory. I have watched the videos where he cleaned the injectors but don't know how he kept the valve open
Kevin
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Kevin, for Back-flushing you need to carefully open the pintle on the tip with a swedge or tweezers being carefull not to bend it. Then cut a sliver of plastic off of a zip tie to wedge between the pintle and the tip to keep it open. You'll need a short section of rubber hose to connect the injector upside down to the tester.
After backflushing you can then remove the ziptie and mount the injector the correct way in the tester to further clean it and check the opening pressure and leakdown.
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Just came from a test drive: it runs wonderful! As many of you said, the injectors made the difference. It runs better than ever before and it only took 13 years to get it that way. I want to take it on the Autobahn and wind it out!
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Thanks Tyler. I was thinking tweezers wouldn't be strong enough to open them but guess it is.