Adjusting basic charging pressure
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Adjusting basic charging pressure
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Important
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The basic charging pressure is the starting point for the Trionic system's pressure control function and must be adjusted correctly.
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1.
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Undo the lock nut on the end piece and break the seal.
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2.
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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.
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3.
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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.
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Important
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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
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1.
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Attach the pushrod to the arm and fit the locking ring.
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2.
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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".
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