Examination After Engine Failure - Rotax 912 Series Maintenance Manual

3) Examination after engine failure

General note In order to find possible causes of the failure, it is important to pass on all
available data. Observations on the aircraft and the engine suspension
can also be of help. It is important to pay particular attention to any of the
following engine phenomena to facilitate troubleshooting.
Engine
Fuel system
Ignition system (shorting cable,
electronic module, charging coil)
Spark plug
Rough running
Ignition
Carburetor
Engine
Engine stoppage
Oil system
Oil pump
Effectivity: 912 Series
Edition 3 / Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Engine runs erratically and misfires
part
part
Should one of the above mentioned points occur even
NOTICE WARNUNG
for a short time then a detailed check of the engine is
necessary. The fault needs to be located and correct-
ed.
Unintended engine stoppage by seizing
part
possible cause
fuel supply
vapour locks
contamination
float chamber venting
false air intake due to defective carburetor flange
carburetor icing
malfunction
grounding defect
wrong spark plug connection
Rough running engine
possible cause
wiring (assignment fault)
fuel supply
contamination in float chamber or float needle
valve
float chamber venting
false air intake due to defective carburetor flange
incorrect synchronization of the carburetor
engine temperature too low
too lean carburetor jetting due to conditions pre-
vailing in intake silencer
possible cause
oil pressure too low or no oil pressure
oil shortage
contamination
incorrect venting
defect
05-50-00
page 7
September 01/2012