page 66
July 01/2008
Effectivity: 914 Series
Edition 2 / Rev. 0
d04278
INSTALLATION MANUAL
BRP-Rotax
13.3.2) Measuring of the pressure in the crankcase
Measure of the mean crankcase pressure at full load (blow-by gas pressure)
responsible for proper oil return from crankcase to oil tank.
A pressure indicator (4) (pressure gauge with incorporated viscous damper)
may be fitted instead of the magnetic plug (5) or the crankshaft locking screw
(6) (see Fig. 35).
◆ NOTE: The connecting thread is M12x1,5 (metric) for the magnetic
plug and M8 for the crankshaft locking screw (use always new
gasket).
The pressure in the crankcase at full load must not exceed the prevailing
ambient pressure by more than 0,45 bar (6.53 psi) at 90 °C
(194 °F) oil temperature.
If both pressure readings are within the specified limits, under all operating
conditions, the lubrication circuit should be working sufficiently.
▲ WARNING: If the readings exceed the pressure limits then the flow
resistance of the oil backflow from oil sump to oil tank
(contamination, restrictions of cross-section etc.) is too high.
This condition is unsafe and must be rectified without delay.
08324
max. 0,45 bar above atmospheric
pressure
Fig. 35
4
6
5
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