Priming Injection Pump Problems - page 3 - Troubleshooting - VWDiesel.net The IDI, TDI, and mTDI source.

• #30 by RobertMcC on 12 Mar, 2014 13:54
• Leaning towards governor. It shut off the proper way, so the WD40 and the assembly oil is not your problem, It would have kept on running away when the fuel was shut off if it was the case.
  
  
• #31 by burn_your_money on 12 Mar, 2014 17:09
• Back the max fuel screw out and try again. At least once you get it running in a controlable manner you can do some more troubleshooting.
  
  If those are new rings you'd be best to install it and put some load on them so they don't glaze the walls.
• #32 by Spokerider on 13 Mar, 2014 00:30
• After reading a bunch of posts on run-away diesels, it seem many of the causes are related to having the throttle lever / governor shaft spline misaligned, after having the pump cover re and re.
  
  I'm inclined to start looking here, rather than making adjustments to screws that I understand very little about.........plus, it's more variables to consider if I start making compounding adjustments.
  
  Getting back to throttle lever / governor shaft spline alignment........is it really so, that having the lever off by just 1 tiny spline, that the engine can redline upon starting, as was the case with mine?
  
  When I was about to put the lever onto the governor shaft [ the governor shaft has a slot in the top, like a screwdriver blade would fit into ] I first turned the shaft all of the way counter clock wise, as in full throttle position. Then, I lined up the mark [ that I had scratched into the lever with an awl ] on the lever with said gov shaft slot, and seated the lever. I checked the rotation of the throttle, and it had a full range of movement and *seemed* to operate like it did before I ever got into the pump.
  
  Did I do this right? Now, I'm thinking, I could have rotated the gov shaft fully clockwise [ throttle off ] before aligning my lever mark and seating the lever onto the spline.........as in 180 deg off from the 1st way. Can this be done? I'm trying to remember from memory if the gov shaft HAS a full 180 deg rotation or not.
  
  Getting back to moving the throttle lever only 1 spline.............if my engine is running away at start up, which way do I need to realign the throttle lever, clockwise [ throttle on ] or counter clockwise [ throttle off ]?
  
  
  I can see this may take some experimenting [ multiple attempts ] to get the alignment correct............... and that last laver spring is a real bugger to get back on.
   Can I just have that last spring in place on the gov shaft, but have it relaxed and not wound up for these tests?
  
  The AAZ pump;
  
  
  
  
  
   
• #33 by burn_your_money on 13 Mar, 2014 05:01
• Just leave to top spring, washer thing and 10mm bolt all off until you get the throttle position set properly.
  
  I wouldn't even bother hooking up the other springs until you get it on the right spline. You want to move the shaft clockwise, or the throttle lever CCW, whichever you prefer.
• #34 by Spokerider on 13 Mar, 2014 22:18
• Well, it's fixed and running well.......finally. As usual, it was user error.......
  The problem was as I had thought, I had the throttle lever on the wrong gov shaft splines. It was about 10 splines out.
  
  When I first disassembled the pump, the throttle lever and springs started to go "sprong" as I didn't know how to remove them in a controlled manner. I tried to save the settings and in doing so, blindly put the throttle shaft on again in the wrong position. When it came time to marking the lever with an awl, it was doomed to failure, as it was already in the wrong position. The throttle lever has factory markings on it hidden under a washer, and once lined up with the slot on the gov shaft, it was correct.
  
  Anyway, it's all good now. The engine started well with the cold start lever on, and the idle speed dropped nicely once the cold start handle was depressed. The engine even shut off when I tried the manual shut off lever. 
  
  Hopefully others having similar problems can use some of this info.
  
  Thanks all for your kind help.
• #35 by burn_your_money on 14 Mar, 2014 10:34
• Good to hear you are back in business.