Rebuilt injectors w/ DNOSD 273 tips...
Hey everyone,
just thought I would share my project last night. I finnaly got a set of rebuilt injectors finnished up. I got a set of "GTD" 273 injector tips and set up the injectors at 2,400 psi with the pop tester. The difference is noticeable for sure! Low end off boost power was improved, throttle response is better, and more crisp. The GTD tips are also supposed to be better with higher fueling compaired to the 193 tips. To sort of test this, I turned the full power screw in about a 1/3 of a turn. This is bottomed out on the limiting collar, and is where I had it set this past summer for a while. The difference was night and day! It didn't run anything like this before. I'm pushing 18lbs of boost 1st and 2nd gear and it builts up to 20 in third. (I've still got the auto trans so with the slipping converter it really doesn't load the engine that well). I think with the manual I'll be at 20lbs easily in 1st or second gear, and I haven't even removed the collar off the screw yet! If your car has some miles on it I would recomend doing the injectors! Compaired to my friend Alex's car, mine ran great (his misses and smokes when cold, mine ran smooth even in single digit temps) and the new injectors still made a big difference! Jason |
Glad to hear it went well!
We just received a pack of 12 Monark 039 305 138 nozzles, which are equivalent to the Bosch 273 but higher quality and a different, more modern tip design that promotes better fuel atomization, esp for biodiesel. Haven't had a chance to put them in yet but I anticipate a solid improvement. One set of 6 is going into my '83 760 with 122k, excellent compression and 6 new Bosch 293s already in it, so that will be a direct comparison of Monark 138 to Bosch 293 both in new condition on a known good motor. Will be interesting to see what kind of difference the Monarks make on that one, if any. It runs very nicely with the Bosch tips and has lots of power. If the Monarks are able to make a noticeable difference I will be impressed. The other set is going into a N/A '84 D24 240 with around 255k on its original 193s. Expect to see a major improvement there, even though it already runs reasonably well. I'll report back with results... will hopefully find time to get to this sometime this weekend or next week. |
I was going from the original 193s so the improvement was obvious. I too am interested to see how much of a difference the butt dyno shows over the 293s. After talking to Giles, the 273 and 293 tips are very close performance wise.
Jason |
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Where are folks getting their injector nozzles? I just pop tested my injectors, pressures were ok but one pees and drips. Cleaning did not help so I'm in the market for replacement nozzles. Are VW GTD nozzles an appropriate upgrade to an otherwise stock engine?
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I got mine from the vwparts place on line, I cant think of the name but I posted up the link in the suppliers section under cheap cheap parts. They are made offshore but they are working very well and the quality seemed nice. They are 45 for a set of 4... Pretty good deal. The 273 tips are a nice upgrade even if you arent pushing lots of fuel. Anything is better than worn out!
Jason |
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I have another set of the same Monark nozzles that I am getting ready to put into my 760 TD sedan. Hoping for equally good results with that one. You can contact Kaia at MercedesSource at 1-360-715-BENZ. Since their main business is in selling Mercedes nozzles, they don't stock the ones needed for the VW/Volvo engine, but they are able to get them on special order in about two weeks. They are worth the wait. The part number you want is Monark 039 305 138, which is equivalent to the Bosch DN 0 SD 273 spec -- the nozzle to go with if you want a little more power without sacrificing MPG or dealing with additional smoke. They cost $20 each so only really a buck or two more than the Bosch. MercedesSource is a great group of people to deal with -- they really try to help you out. I know you also said you liked to try to use local suppliers when possible -- you will like these guys. If enough people start ordering these nozzles, they might start stocking them, which would be great since it would bring price down, make them more readily available, and be good for their business as well. |
Just ordered 6 of the Monarks. V8volvo, you must be more of a charmer than me, she charged me $25 ea, so after duty fees, tax, and shipping, the total ended up just under $200. Could take up to a month.
Almost ready for this. Pop tester is working good, ultrasonic cleaner ready w/ plenty of solution, plenty of sandpaper. Just need to find a source for shims. |
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The only real challenge to the job is getting everything squeaky clean. And you can't use any steel brushes or cleaning supplies (or scotchbrite) on any of the internal surfaces of the injector (even the insides of the outer bodies). Brass is OK but I was not able to find a brass bore brush of the right size anywhere. I ended up getting creative and used a nylon shotgun cleaning brush I got from Big 5 :D mounted in an electric drill. Did a great job. Between that, a compressed air supply and plenty of biodiesel it was not hard to get everything sterilized. Just be ready to spend a whole day at it, from injector removal, teardown, rebuild, testing, balancing, to reinstallation and don't rush. Extra time taken in the rebuilding process is worth it when you hear the car start up and run that much better as a result. The 244 diesel that got the Monarks is now returning 30 mpg in mostly mountain driving. It used to get 27 before the injectors, and had less power and more smoke too. 2000 miles or so since putting them in and no issues. :cool: |
Happy to find and revive this thread.Thanks a lot.
Where to get the adjuster washers/shims? I saw a smaller custom kit on the mercedes website for around $49. https://mercedessource.com/store/var...him-washer-kit Not sure if that works. Other known sources? |
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Posted to ask what injectors you have? As I'm after a set of Monark 039 305 138 nozzles but can't seem to find anywhere to buy then online |
Mercedessource makes a shim kit that's not a bad deal, I have one and I'm sure I'll never use all of its pieces so would happily loan it out to anyone for free (with a deposit of course) who needs them for injector work, provided it were returned speedily.
Otherwise, any diesel fuel injection shop will have a mountain of these and should have no problem getting injectors set up properly for you, if you go that route. Local guys here do it for a few bucks an injector -- undoubtedly a good deal once you factor in the time, learning curve, and equipment to really do it properly yourself, unless you have no one near you who is capable... Even then, sending them out in the mail still seems like a better option to me. I've redone a few sets myself, not planning to do any more. |
Im at 242k and rebuilding injectors and replacing the nozzles with updated ones has been something I've been thinking about doing for a couple of months now. I just don't have the knowlege or tools to pop test and rebuild mine.
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Good starting primer on injector servicing:
HOW-TO: Rebuild Diesel IDI Injectors Setting/balancing the pop pressure is tedious, messy, and time-consuming. Test, keep good notes on pressure readings, verify no drippage when pressure held to just under pop for several seconds, disassemble, reshim, reassemble, test again... Not to mention cleanroom conditions. Not to mention inherent dangers involved in high-pressure fuel jets near the human body... Next time I need to service the injectors, I would probably find out from v8volvo who these "Local guys here do it for a few bucks an injector" are! |
Good link. Thanks, I feel a little bit better now about doing this myself.
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Alright. Just keep your hands away from the nozzle spray, and do not use non-hi pressure fittings on your pop tester (if you end up building one yourself).
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oh yes that one i know.
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