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It appears i have underestimated volkswagen. It appears that they have rather large and girthy girthy injection units. I mean i'm impressed look at that what we have here an injection unit. That is electronically operated.

Yet the high pressure is supplied via the camshaft and this rocker arm as the camshaft rotates. It depresses. The side of this rocker pushing down on this plunger. And that's what creates the pressure.

In the doo doo doo chamber. That's what creates the pressure for the injector to spray and atomize. The diesel it appears that this pump is just a low pressure uh volume pump. It's just designed to move the fuel and the fuel runs into the head ends up at the injectors.

The cam runs cam pushes down pressurizes the fuel solenoid opens up sprays the fuel into the cylinder boom explosion. We have made power the intake and the exhaust valves are run over here off the cam. Actually the camshaft is here it appears that these are just uh rocker shafts for the injectors so down there that littler guy. That's actually the cam back in there because we see here we've got an intake or an exhaust.

An intake and an exhaust talking about these lobes right here another one there and another one there i like it.

100 thoughts on “Inside a vw diesel. high pressure injection #shorts #teaser”
  1. Avataaar/Circle Created with python_avatars MechanicForPeople says:

    I can't believe that 1.9 tdi – PD injection arive also in USA. I worked at least at 200 engines here in Europe. Here it's a legendary engine . Every average or poor guy have this time of engine because of small costs of maintenance. I have a lot of friends with those engines and some of them have even more that 500.000 miles . It is an amazing inginery and if you replace in time some things this engine pass 700.000 miles. Happy to see that.

  2. Avataaar/Circle Created with python_avatars Mark Vickers says:

    Doo de de doo

  3. Avataaar/Circle Created with python_avatars Chas aka Bigcheezmoe says:

    Oh, another Rainman Ray short.

  4. Avataaar/Circle Created with python_avatars Joshua L says:

    Looks just like what Caterpillar used for years. EUI system.

  5. Avataaar/Circle Created with python_avatars mike Sandi says:

    Of corse it's a VW because has a do do do injectors 🤣🤣🤣🤣🤣

  6. Avataaar/Circle Created with python_avatars joenissan says:

    Do doo da dooooooo

  7. Avataaar/Circle Created with python_avatars Dazed Dottie says:

    The phone my fav character to hear you impersonate

  8. Avataaar/Circle Created with python_avatars Alouis Schäfer says:

    Basically a miniature Caterpillar with 2 cylinders missing

  9. Avataaar/Circle Created with python_avatars HOMEGUY4X4 says:

    I've got a 2013 VW Passat TDI 2.0 my back and forth to work car… love that things

  10. Avataaar/Circle Created with python_avatars Justin.S says:

    doo dee doo chamber lmao.

  11. Avataaar/Circle Created with python_avatars Alouis Schäfer says:

    Pumpe Düse aka Unit Injector
    Because the Commonrail was still in the making…
    These guys need a VW 50501 approved 5w40 oil. Usually says "VW PD" on the label somewhere too.
    Be mindful about that.

  12. Avataaar/Circle Created with python_avatars Kevin Curry says:

    This will be fun

  13. Avataaar/Circle Created with python_avatars Greg Bell says:


  14. Avataaar/Circle Created with python_avatars Job38 Four says:

    Right now anything will beat Ford Echo Boost or Ford Bronco motors…..

  15. Avataaar/Circle Created with python_avatars Joe B says:

    I have a 2006 bew Jetta wagon last of the mk4 body style.. 415,000 kms she got another 200k+ in er I’d say.. still original clutch and turbo.. hard to believe ehh

  16. Avataaar/Circle Created with python_avatars David Utidjian says:

    Wow that is cool. I used to work on the VW Jetta/Golf diesels that VW made back in teh 1970s and 80s. They were VERY simple yet also very reliable IMO. I still have all the special tools for doing "tune ups" (wrenches, camshaft lock, flywheel lock, injection pump timing indicator, valve clearance tools and shim sets.) Might even have the Robert Bentley manuals for working on them. Most of it completely worthless now.

  17. Avataaar/Circle Created with python_avatars Jonathan A says:

    LOL! Large and girthy

  18. Avataaar/Circle Created with python_avatars Sebastian Flocke says:

    Very good system, as long as you dont push it to its limits. The 1.9PD generally last forever, the 2.0PD not as much. There are also 2.5L PD TDI's in the VW T4 for example but these (and the 16V 2.0PD BRD) suffer from worn injector seats. Over time, the injection units wear into the head and this results in higher tolerances, which result in long cranks and injection problems. These system also suffer alot from soot collecting in the spray nozzles, which over time reduce your power output alot, espacially in the higher powered PD engines. Also, under the force of the compression stroke in the unit, the camshafts wear quicker and will eventually lead to a puffing sound out of the intake. Aaaaand these engines are known for rounding out the shaft that drives the oil pump, which will eventually lead to engine destruction. AAAAAND routing the injection cables through the oil isnt generally a good idea because these will fail over time and cause injectors to not fire anymore. AAAAAAAAAAAAAND keeping your two mass flywheel in good shape is also important, because a defectice flywheel can get the fuelinjection correction to fluctuate, which will in turn give you a rough running engine. And I almost forgot the cracking 16V heads, which usually crack between valve seats

    There are reasons why everyone switched to CR Diesel injection. But still, cool engines with alot of torque and a very unique sound. There was also a V10 PD TDI in the Phaeton and Touareg, which had gear driven cams, not belt or chain driven.

  19. Avataaar/Circle Created with python_avatars Robert Dillard says:

    Almost looks like an exhaust brake set up. A real exhaust brake like in big trucks

  20. Avataaar/Circle Created with python_avatars Heckleburger says:

    Welcome to the 1.9PD(Pumpe Düse) TDI engines, these were short-lived in the states but used longer overseas. It was a stop gap until common-rail and fuel standards(ULSD) arrived here. They require very specific oil as to not wipe out the cam shaft lobes because as you noticed they are under extreme stress. If it doesn't meet VW 505.01 spec than the oil is no good. The units themselves rarely have a problem, it's the camshaft and roller rockers that are sacrificed by the use of an incorrect oil.

  21. Avataaar/Circle Created with python_avatars Sharon Lent says:

    Ray, is there a way I can email you? I have a question about my car. I think I know what the problem is but I would like a pros opinion.

  22. Avataaar/Circle Created with python_avatars Jack Martin says:

    Amazing scientists 👨‍🔬

  23. Avataaar/Circle Created with python_avatars Ray Gale says:

    Have a look at GM's old Series 60 light industrial engines, electronic unit injectors waay back in the late '80s early '90s.
    GM's 71 series 2 strokes had mechanically controlled unit injectors waaay waaay back in the 1930's. Electronic unit injectors are good, until they aren't. Swap out an injector and the engine either won't start at all or runs very poorly until the ECM has been given new calibration numbers for the squirter.

  24. Avataaar/Circle Created with python_avatars Jeff Treseder says:

    It's not the girth that matters, it's how you use it.

  25. Avataaar/Circle Created with python_avatars Eric Furey says:

    Those are known as electronic unit injectors

  26. Avataaar/Circle Created with python_avatars oobaka1967 says:

    If "girthy" isn't considered a dirty word, it should be.

  27. Avataaar/Circle Created with python_avatars Christian Regitz says:

    my parents have a 1.9tdi from 2006 and it still runs great at almost 220k miles! one of the best engines vag group ever made.

  28. Avataaar/Circle Created with python_avatars Ted Stringer says:

    If you need the special tools for the timing belt, let me know. I’m local and have them.

  29. Avataaar/Circle Created with python_avatars Matthew Dale says:

    Good ol cam breaking pumpeduse. Careful with those injectors.

  30. Avataaar/Circle Created with python_avatars The Underground Lair of the Squankum says:

    Veeedy intedestink! I saw those rockers and was just confused. But I'm guessing that behind all of that is traditional VW inline 4 valvetrain: one cam, eight valves, vertical, in a row, bucket lifter (hydraulic) directly pushed up and down by the cam lobes, brutally simple and light weight (other than the width of that lifter.)

  31. Avataaar/Circle Created with python_avatars Mike Oswald says:

    Really interesting, as I thought (mistakenly) that all the European diesels had gone FADEC (ECU) controlled, common rail, 2 fuel pump designs. Too soon old, too late smart!

  32. Avataaar/Circle Created with python_avatars Nik Price says:

    I used to have an Audi A4 Avant with the 1.9tdi engine with those unit injectors. I think VAG call them PD or Pump Deuse injectors. The Volvo FH12 I drove for work had the same system. It's very reliable and generates lots of torque.

  33. Avataaar/Circle Created with python_avatars j p says:

    Hi Ray

    That is typically known as a “unit injector” system where the high pressure pump and injector are in one unit.

    This was first used in some military and serious off road/safari vehicles because of the reliability ; you could loose one cylinder and keep on driving but loosing the high pressure pump in a common rail system would mean engine failure.

    As you mention, the unit iniectors are beefy things, and the cam belt that drives them takes a beating! VW started to use off-round (not a perfect circle) on some of their cam belt pulleys to dampen the load on the belt.

    Keeping up on the cam belt changes is also good.. as for oil, it probably will be happiest with what is specified in the book!

  34. Avataaar/Circle Created with python_avatars Fedi says:

    VAG engines are actually really good when u take good care of them.

  35. Avataaar/Circle Created with python_avatars MindDrive says:

    where is the doodedooodooo chamber??? 3 mechanics threatened to call the cops when apparently im the bad guy

  36. Avataaar/Circle Created with python_avatars Brian Kmetz says:

    As mentioned many times already, good engine but it was oil type critical. VW made the cam lobes for the valves thinner to make room for the huge injector cam lobe. This put a LOT of stress on the valve lobes. A lot of owners used synthetic 5W-40 diesel rated oil to get something a little heavier for the lobes. The VW spec oil was 5W-30. The VW PD engine was the last engine that was EPA compliant. The next generation engine, the common rail, introduced in 2009, was never compliant in regards to NOX and was part of the diesel-gate scandal (2009-2015 models). I drive a 2015 Passat SE TDI, the last year one could get a manual transmission in a Passat.

  37. Avataaar/Circle Created with python_avatars Alexander McKay says:

    And there is another pump in the tank. 20 psi from the tank, 200 psi the the injectors, and 2000 psi to the cylinder. Quite amazing and fantastic.

  38. Avataaar/Circle Created with python_avatars SheerWill Survival says:

    Wow crazy

  39. Avataaar/Circle Created with python_avatars Tired old mechanic says:

    Detroit Diesel used cam operated injectors starting in 1938. It was very common in diesel engines.

  40. Avataaar/Circle Created with python_avatars HelterSkelter says:

    That pump is a Pump deuse. Pumps fuel in one half….
    And creates vacuum in the other. Combined vaccum/fuel pump

  41. Avataaar/Circle Created with python_avatars Andrzej Zieliński says:

    Injectors are integrated whit the pump, the downside is a high cost of the unit.

  42. Avataaar/Circle Created with python_avatars Cmdr Damaskus says:

    do do ta do chamber . yes yes yes do do ta do

  43. Avataaar/Circle Created with python_avatars james says:

    I've got a 1.9 tdi bluemotion golf

  44. Avataaar/Circle Created with python_avatars Tom Mcglynn says:

    I have 06 10 Jetta and a 15 GolfWagon. 👍

  45. Avataaar/Circle Created with python_avatars Glen Fynney says:

    doo doo de doo chamber… pmsl – thats awesome ray!!!