Rotax 912 Series Maintenance Manual page 401

Effectivity 912/914 Series
Edition 1 / Rev. 0
BRP-Rotax
Maintenance Manual
The bearings are tested by means of the pressure drop measuring
method.
■ 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))
◆ 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.
78-00-00
page 13
May 01/2007