Rotax 912 iSc Maintenance Manual page 113

4.1) Compression check for fault-tracing
In the course of fault-tracing a compression check can also be per-
General note
formed.
A compression tester is required to check compression. The compres-
sion should be between 9 and 12 bar (900 kPa and 1200 kPa).
Compression check for fault-tracing.
Instruction
Step
1
2
3
4
Individual readings for the cylinder must not differ by more than 2 bar
Measurement
(200 kPa).
If the value is below 6 bar (600 kPa), inspection, repair or overhaul must
be carried out in accordance with the BRP-Powertrain instructions for
continued airworthiness.
- Detailed inspection of affected engine components.
For accomplishment the following special tool is required.
Special tools
n.a.
Effectivity: 912 i Series
Edition 1/Rev. 0
BRP-Powertrain
MAINTENANCE MANUAL
Keep the propeller area clear!
WARNING WARNUNG
All LANE select switches must be "OFF".
Operate the engine until the temperatures have stabilized for a period of 5 min
(engine oil temperature between 50 to 70 °C (122 - 160 °F).
Unscrew and remove top spark plugs.
Press compression tester (1) over the spark plug hole and use the starter to
turn the engine over with open throttle until maximum pressure is reached.
Successively take readings on all four cylinders and compare results.
Part number
Compression tester
Procedure
Description
12-20-00
page 11
January 01/2012