Adjustment of basic boostpressure
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Adjustment of basic boost
pressure
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Important
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Basic boost pressure is the point of departure for the Trionic system's pressure
regulating function and must therefore be adjusted to the correct level.
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1.
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Undo the end piece's
locknut and break the seal.
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2.
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Remove the circlip and unhook the push rod from the boost pressure
regulator's operating arm (the easiest way of performing the operation described in
point 2 is from underneath). Use special tool 83 94 538.
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3.
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Adjust basic boost pressure by screwing the end piece in if basic boost pressure
is too low or screwing the end piece out if basic boost pressure is too high. Turning the end
piece 1 complete revolution will change basic boost pressure by about 0.02
bar.
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Important
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The boost pressure regulator must never be "prestressed" (tightened) by less than 2
mm (2 turns) even if basic boost pressure cannot be adjusted so that it lies within the
tolerance limits of 0.40±0.03 bar.
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4.
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Connect the pushrod to the actuator arm and fit the locking ring.
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5.
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Check the basic boost pressure on the road, see "Checking basic boost
pressure (on road)" in Service Manual 2:4 "Exhaust system, cooling system, turbo system". If
basic boost pressure cannot be adjusted, see "Control valve, turbo pressure" and "Diaphragm
unit" in Service Manual 2:4 "Exhaust system, cooling system, turbo system".
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