Effectivity 912/914 Series
Edition 1 / Rev. 0
78-00-00
page 13
May 01/2007
d02627
BRP-Rotax
Maintenance Manual
The bearings are tested by means of the pressure drop measuring
method.
â– CAUTION: For this test, compressed air at approx. 2 bar (29 p.s.i)
and a testing device are needed.
Consisting of:
2 pressure gauges
1 orifice jet (inner diameter = 1 mm (.039 in.) / length = 3 mm
(.12 in.)
1 connecting nipple M12x1.5
for the thread in the middle section of the turbocharger
1 cover plate for the oil outlet
n.B. connecting hoses
Procedure:
Screw in the connecting nipple and close the oil outlet with the cover
plate.
Connect the pressure gauges together with the regulating valves.
Apply a constant pressure of 2 bar (29 p.s.i) to the connection
cable. The pressure drop must not exceed 50%.
(From 2 bar (29 p.s.i) to max. 1 bar (14.5 p.s.i))
â—† NOTE: For optimum results, the position of the shaft should
always be changed slightly during the check, i.e. the
shaft should be moved backwards and forwards in axial
and radial directions.
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