Author Topic: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components  (Read 35896 times)

Offline maxfax

  • Veteran
  • ***
  • Posts: 2126
    • View Profile
This is to clarify where some of the components are, and how to adjust your pump..

Below Pictured is the non turbo no altitude compensating pump


The major difference between this, and the turbo/altitude compensating pumps is the addition of the "LDA" on top as pictured below


The most common asked question is usually about turning the fuel up or down.. Adjusting the smoke screw so to speak..  This adjustment is pictured below..  If your pump has never been tampered with there will be a steel collar crimped over the threads..  Remove that collar by some manner and loosen the 10mm jamb nut.. Best method on the car is trial and error, typically a quarter turn at a time.. When you get close you may need to use eighth of a turn increments.. But this can vary pump to pump pending on wear and such..

 Turning the screw clockwise increases the fuel injected over the entire rpm range.. Turning the screw counter clock wise reduces the fuel.. Keep in mind that when increasing the fuel you may need to decrease the idle, and when decreasing the fuel you may need to increase the idle..


Idle adjustment is pictured below, it's the screw closest the engine.. The screw that is further away from the engine is the max RPM adjusting screw.. Both of these adjustments are pretty self explanatory.
« Last Edit: November 08, 2011, 09:47:57 PM by maxfax »

Online rallydiesel

  • Veteran
  • ***
  • Posts: 1858
    • View Profile
Re: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components
« Reply #1 on: November 09, 2011, 10:30:49 AM »
Nice diagrams.
2006 Jetta TDI - gtb1749v, Malone 2, Frank's Titan 2 cam, VR6 clutch....
1991 Jetta TD - sold :(
2001 Golf TDI - Son's
1981 Rabbit - BEW tdi swap project

"ONCE YOU GO CLACK, YOU NEVER GO BACK"

Offline maxfax

  • Veteran
  • ***
  • Posts: 2126
    • View Profile
Re: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components
« Reply #2 on: November 09, 2011, 09:31:33 PM »
IN this thread http://www.vwdiesel.net/forum/index.php?topic=10569.0 the mounting points for the pump are shown as well as some of the timing procedure...  For reference, to advance the pump timing turn it in the opposite direction of engine rotation (top of the pump towards the valve cover)  To retard the timing turn the pump the same direction as engine rotation (top of the pump away from the valve cover)


For your guys with the turbo pump, the screw on top of the LDA as shown here should be adjusted as follows
LDA screw allows you to tune the initial position of the boost pin. In order to see the full range of LDA enrichment, you want the follower pin resting on the largest diameter of the taper at zero boost without also contacting the step adjacent to the ramp.


« Last Edit: November 09, 2011, 09:37:04 PM by maxfax »

Offline vanbcguy

  • Veteran
  • ***
  • Posts: 1722
  • Vancouver, BC
    • View Profile
Re: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components
« Reply #3 on: November 19, 2011, 12:00:08 AM »
WRT to the idle adjustment... 109 style pumps (later 1.6s, all AAZs) have a different setup.  The idle screw identified in the diagram is actually called the "residual fuel screw" on the 109 pumps.  It has some impact on idle but overall if your throttle lever is set with that screw actually affecting idle, it needs adjustment.  There is an additional overall idle screw, fast idle max RPM and "regular" idle min RPM screw that need to be adjusted to set the idle speed.
Bryn

1994 Jetta - AHU M-TDI - Jezebel Jetta
2004 Jetta Wagon - 1.8T - Blitzen

Offline theman53

  • Global Moderator
  • Veteran
  • ****
  • Posts: 7098
  • Holmes County Ohio - North Central Ohio
    • View Profile
Re: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components
« Reply #4 on: February 05, 2012, 07:05:14 AM »
This is also helpful if buying a bosch DGK-126 kit to reseal.

large image link
https://picasaweb.google.com/lh/photo/YTkJ-XdoXh-clMtMC2Rl2EtYK99oRav9vx9qGegC_28?feat=directlink

Offline Blocksmith

  • Veteran
  • ***
  • Posts: 251
  • Wrench Lurker
    • View Profile
Green 83 Rabbit 4dr, 5 speed ACH trans swap, ported 1.6D mech lifter w/ vnt15, na pump w/ gov mod, gasser intake mani, 2.5" exhaust, bilstein sports and cut mk2 springs, ss brake lines, 14" vw bottlecaps

Offline hillfolk'r

  • Veteran
  • ***
  • Posts: 1532
    • View Profile
Maybe this will help a few people its more like a tech tip  ,but for most 99% engines you will see its easy to remember direction of rotation or "DOR"
 from the accy/belt drive end of the engine (usually opposite of the of the flywheel, or pto end)
they turn clockwise or to the right. I dont care if its a lawnmower or a diesel on a ship all (99%)run clockwise viewed at belt end. So with that info in your brain a vw engine viewed as installed basically turns with the road wheels when u r driving forward.
Throttle cables ftw

Offline vic_vr6

  • Newbie
  • *
  • Posts: 12
    • View Profile
Re: BOSCH VE Mechanical Diesel Fuel Injection Pump Adjustments & Components
« Reply #7 on: September 24, 2013, 05:44:08 AM »
Anyone know what the stock setting for the governor shaft adjustment should be? I did a recent pump re-seal and did not mark or not the location of the shaft  :'(

Pic attached for reference.