Service procedures Boost pressure, checking Special tools: 6065, 6223(TAD), 6591 (TWD) 1 Fit the nipple 6223 (6591) in the existing socket in the inlet pipe. Connect manometer 6065.
TAD-engines
NOTE! Full load must be maintained long enough so that the pressure can stabilize. The pressure varies, depending on the temperature of the inlet air. The boost pressure is given at +25°C (77°F), which implies that the measured pressure must be corrected as per the diagram below, if the inlet air does not have this temperature during the measurement. Example: A pressure measurement of 100 kPa (14.5 ft/lb) at 0°C (32°F) corresponds to a pressure of 90 kPa (13.05 ft/lb) at +25°C (77°F).
TWD-engines
A. Measured boost pressure
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B. Correction curves C. Temp. of inlet air
Measurement shall take place continuously with full load with full throttle, while the engine revs slowly passes a given number of revs for the engine; see Workshop Manual, Technical Data for each engine concerned. The pressure must not be less than the given values.
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