Timingbelt problem and part ID

[Maarten]

I replaced the timingbelt when I swapped the engine last week but I think I have some worn pulleys:




The backside of the belt is not flat but warps a bit up and down, it looks like something is skidding on the belt (oilpump?) but the belt is certainly not too loose... and the "teeth" side is damaged...  :?

2nd question:

what is this part on the injectionpump?



I didn't have that on my 1600D pump and forgot to check where the cable goes that belongs there.

[Maarten]

Bump.. nobody knows what the thing is??

[Patrick]

Is there a wire connector on it? Seems to me there was some discussion about an "timing advance mechanism" that has something to do with emissions control. THe concensus was wire it in paralell with the fuel shutoff solenoid for better performance. There's one on the 1.9 IDI that's in my 92 Jetta (not original) and that's the way the previous owner has it hooked.
If your country's emissions tests are a little more involved than ours (diesel passenger cars just have to burn clean at an idle) that may not be the best solution.

[Maarten]

There is a wire connector on it yes, and it looks a lot like the shutoffvalve.

Someone on the junkyard told me that the valve was operated by a relay at cold start for fuel enrichment.

The partno: 1465132719

The emission tests are only done once a year (or you must be fogging the streets ) and involve a unloaded accelerationtest where they check the amount of particles.

[Patrick]

That's the way they do commercial trucks here, measure the opacity of the exhaustunder a "snap acceleration" test. Gasoline powered cars get put on a dyno, run at a certain speed/rpm, and a "sniffer" up the tailpipe measures CO, Nox, etc. Just wondered if you had to deal with that on a diesel.

[Maarten]

I cold started my 1.9Td this afternoon and with the engine running I connected +12v to the vale.. nothing really changed in rpm or something  :?

[jtanguay]

for a diesel here in ontario all they do is the visible smoke test.  run the engine for 5 minutes then check for smoke at idle...

[Maarten]

I just checked the VW part program, no partnumber availble when I click it  :?

Only "magnet" with partnr 028 906 283D

[Baxter]

As far as Im aware the "thingy" you talk about takes pump pressure and advances the pump timing to reduce NOX emmisions from cold.
The solenoid is energised only for a short time during initial start up.
Once the car is warm the solenoid is switched off and the timing reverts back to normal.
if you energise the solenoind you will hear the engine note slightly chage, it will become every so slightly more rattley.
I put a AAZ in a T3 for a customer, I tried having it both ways, on and off, it didn't make any noticeable difference to be honest, and under the advice of my local Diesel guru and the absence of a cold start control unit I wired it to the glow plug buzz bar just to help with cold mornings.