BRP-Rotax
MAINTENANCE MANUAL LINE
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.
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 ac-
cordance with the BRP-Rotax instructions for continued airworthiness
• Detailed inspection of affected engine components.
Special tools
For accomplishment the following special tool is required:
Figure 7.3: Compression check for fault-tracing. TYPICAL
Part number
Description
part no.: n.a.
Compression tester (1)
Effectivity: 912 Series
Rev. 0
Page 9
January 01 2020
