d02880.fm
MAINTENANCE MANUAL
BRP-Powertrain
Effectivity: 912 Series
Edition 2 / Rev. 0
12-20-00
page 15
October 01/2009
5.1) Compression check for fault-tracing
General note In the course of fault-tracing a compression check can also be per-
formed.
A compression tester is required to check compression. The compres-
sion should be between 9 and 12 bar (130 and 174 psi).
Instruction Compression check for fault-tracing.
Measurement Individual readings for the cylinder must not differ by more than 2 bar
(29 psi).
If the value is below 6 bar (87 psi), inspection, repair or overhaul must be
carried out in accordance with the BRP-Powertrain instructions for contin-
ued airworthiness.
- Detailed inspection of affected engine components.
Graphic Compression check for fault-tracing
Fig. 6
08651
Step Procedure
1 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).
2 Unscrew and remove top spark plugs.
3 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.
4 Successively take readings on all four cylinders and compare results.
Part Function
1 Compression tester
A
B
1
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