Effectivity 912/914 Series
Edition 1 / Rev. 3
78-00-00
page 5
October 01/2010
d04781
BRP-Powertrain
Maintenance Manual
◆ NOTE: Fig. 78 -1 shows a schematic arrangement of a boost
pressure control with the wastegate in the exhaust
stream
(1) engine
(2) exhaust turbocharger
(3) boost pressure regulating valve (wastegate)
Because of the large speed range of the engine and the varying power
requirement, control of the exhaust turbocharger is necessary to
achieve the respective nominal pressure in the airbox.
The waste gate directs part of the engine exhaust gases so that they
bypass the turbine and flow directly into the exhaust (by-pass).
◆ NOTE: With the wastegate completely open, the engine per-
formance can reach up to approx. 70 kW since not all
of the exhaust gases bypass the turbine.
2.4) Connections for instrumentation
■ CAUTION: Consult also the relevant sections on connections for
instrumentation in the latest Installation Manual.
2.4.1) Exhaust gas temperature display (optional)
The exhaust gas temperature is monitored by means of 4 sensors on
the exhaust manifold. The temperature display device is connected via
NiCrNi control lines.
On 912 Series: The manufacturer of the exhaust system must attach
or provide the connections M8x1 for installation of the
metalsheathed thermocouples, part no. 966370, in the
exhaust bends.
On 914 Series: The connection thread M8x1 for attachment of the
metalsheathed thermocouples, part no. 966370, are
already provided in the exhaust bends.
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