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Adjusting basic charging pressure

Adjusting basic charging pressure

To remove


Important

The basic charging pressure is the starting point for the Trionic system's pressure control function and must be adjusted correctly.



1. Undo the lock nut on the end piece and break the seal.

2. Remove the locking ring and unhook the pushrod from the wastegate arm (step 2 is easier to carry out from below). Use special tool 83 94 538.

3. Adjust the basic charging pressure by screwing in the end piece to increase it or screwing out to decrease it. Screwing the end piece 1 turn will change the basic charging pressure approx. 0.02 bar.


Important

The wastegate must never be "pretensioned" more than 2 mm (2 turns), even if the basic charging pressure cannot be adjusted to within 0.40±0.03 bar



To fit



1. Attach the pushrod to the arm and fit the locking ring.

2. Check the basic charging pressure on a road test, see Service Manual "2:4 Exhaust system, Cooling system, Turbo system", "Checking boost pressure (on the road)". If the basic charging pressure cannot be adjusted, see Service Manual "2:4 Exhaust system, Cooling system, Turbo system", "Wastegate valve, turbo pressure" and "Diaphragm box".

3. Seal the pushrod.