1984 Jetta , TDI WE MUST! (1.9 AHU M-TDI)

[8v-of-fury]

Hmm, It is possible. I don't see how though. I had used my old throttle lever (external) and it had marks scribed in it from when I indexed it properly from removing my n/a pump lid.

However thinking back.. I am pretty sure I did what Libby said WAY back about moving the throttle lever over one spline to get more max fuel screw.. HMM

[8v-of-fury]

LAdies and probably just gentleman, I need info on shimming the governor assembly.

I have the pump (1.9 aaz) tore down and ready for assembly, so I figured I could do the shimmed governor while I am in there. Not the shimming of the springed governor cage, I already know all about that. .

[410]

If no one else chimes in I'll get back to you tonight after work about shimming the governor assembly.

[carrizog60]

if you remove the side spring that ataches to the lid how do you control the idle?alteast my pump doesent have any more springs to do that on the governor assembly...

[carrizog60]

me and allesslowbudget took a couple of pics and thoughts regarding advance mecanism,if you like go check at the IDI section
http://www.vwdiesel.net/forum/index.php?topic=30518.0

dont know if it serves for TDI but i guess that the same theory is valid on both aplications

[R.O.R-2.0]

LAdies and probably just gentleman, I need info on shimming the governor assembly.

I have the pump (1.9 aaz) tore down and ready for assembly, so I figured I could do the shimmed governor while I am in there. Not the shimming of the springed governor cage, I already know all about that. .

the author of "HOW TO PROPERLY MOD YOUR GOVERNOR" needs advice on shimming his governor? wtf?

[8v-of-fury]

So here is the debut of M-TDI v2.0, it is an early 1.9AAZ body (17mm shaft), AHU rollers, cam plate, timing advance piston and spring, distributor, distributor head, and a 1.6TD lid with a custom hand ground boost pin. Oh its also painted PimpSchliten GOLDMEMBER.

oooh yeah baby. Came out WAY better than expected.




Here is the modified internal throttle lever, you can see the bottom "pin" has been moved out and the fulcrum point has been modified as well. The whole assembly will know sit higher in the pump, and the fulcrum point and longer pin will allow more travel of the collar on the distributor. As well as the grinding necessary to the case for the new lever to fit properly, because it sits higher up.




As can be seen by this side by side comparison there was quite a bit of material taken off of the modified 1.9 pump body, but nothing to crazy.. Just a simple round sander bit in my die grinder and about 2 minutes of my time.





Side by side comparison:

[410]

I hope you didn't grind too much.  The head seal uses that pump surface but I'm not sure exactly where it sits.

[8v-of-fury]

I hope you didn't grind too much.  The head seal uses that pump surface but I'm not sure exactly where it sits.

Hmm, good point! Oh well, I guess we'll see eh? Governor shimming??

[410]

Looking at the pictures again I think you'll be fine for the head o-ring.  You can see where the o-ring sits.  

You'll want to shim the governor out about 1mm.  It's pretty easy to remove the governor assembly but you have to keep in mind that the shaft has another and very important function.  It also advances the timing under high load conditions.  It does this by covering a bleed port on the governor shaft which increases internal pressure.  So adjusting the position of the shaft [which is the adjustment on the front of the pump], you change when the timing advances compared to the amount of fuel being delivered.

So long story short, measure the amount of threads sticking out from the lock nut on the front of the pump.  Take it all apart, add your 1mm shim and reassemble.  Then turn the shaft in 1mm from your initial measurement and you now have a good starting point.  

To make adjusting this shaft easier down the road, drill a hole in the pump mounting bracket so you can make adjustments with the pump in the car.  The only way to adjust it accurately [without a flow bench] is with a gauge that reads internal pump pressure.  You can actually see a jump in pressure when the bleed port gets covered under high load conditions.

[carrizog60]

LAdies and probably just gentleman, I need info on shimming the governor assembly.

I have the pump (1.9 aaz) tore down and ready for assembly, so I figured I could do the shimmed governor while I am in there. Not the shimming of the springed governor cage, I already know all about that. .

the author of "HOW TO PROPERLY MOD YOUR GOVERNOR" needs advice on shimming his governor? wtf?

hes asking about the governor flyweights assembly,not the springs i guess.

why shimm the flyweights assemby?

[410]

You need to sim the flyweight assembly because the point of contact has moved toward the back of the pump.  The contact point moves about 1mm because of the modifications to the lever.  Most times when you change something in these pumps it affects something else.

[carrizog60]

makes sense.
would this lever mod only be a must do on M-tdi or IDI can also benefit from this?
and what about removing the side spring(the bigger or smaller or both?) that goes on the lid?how would the idle be controled?

i had a 1.6 pump that had the spring on the governor spring assembly to control idle,but the 1.9 i have doesent have this spring...


sorry to some sort of highjacking lol

[8v-of-fury]

makes sense.
would this lever mod only be a must do on M-tdi or IDI can also benefit from this?
and what about removing the side spring(the bigger or smaller or both?) that goes on the lid?how would the idle be controled?

i had a 1.6 pump that had the spring on the governor spring assembly to control idle,but the 1.9 i have doesent have this spring...


sorry to some sort of highjacking lol

i do not think there is much to be gained if any on an idi. The idi's stock can fuel more than the injectors and engine can handle. At least i am pretty sure. more than enough fuel for an idi.. but not enough for a tdi.

[8v-of-fury]

Also removing the top lid spring will make it act just as it always did. as that is how the early pumps did it. the one without the idle bump on the cold start lever.