@ Ferdi
The torque for the nozzle tension nut should be between 40-50 Nm.
80 Nm is definitely too high. The nut could break. And this isn't just a random statement; it sometimes happens unexpectedly.
It can be assumed that the opening pressures have decreased after approximately 100,000 kilometers of mileage. In the worst-case scenario, this can affect fuel consumption and engine noise.
Unfortunately, a Bosch service center can only check the initial pressure.
The second opening pressure is adjusted via the upper balancing disc.
After carefully removing the nozzle assembly (nozzle + spacer + stop sleeve), this small disc becomes visible.
It can be assumed that the opening pressure changes by approximately 2 bar for every hundredth of a unit.
For example, if a 1.64mm shim is installed from the factory, to increase the second opening pressure by approximately 20 bar, you would need to replace the shim with one that is 1.74mm thick.
The initial opening pressure is adjusted using the pressure setting pin. This does not apply to the NBF nozzle holder
.
Here, it's being adjusted using the lower compensation disc, because a different pressure pin would change the signal for the MSG (manifold absolute pressure sensor). This would result in an incorrect signal for the start of injection.
Even with the NBF nozzle holder, the nozzle can be removed. The signal settings remain the same. Unless, of course, you handle it roughly
(don't drop it or anything like that).
Also, the nozzle and needle always belong together. They are not interchangeable, as they are factory-matched to ensure the correct clearance.
best regards
zodiac
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