Rotax 912UL - compression test
in 912 / 914 Technical Questions
10 years ago
Hi. Today I made compression test by single gauge on my 912UL (80hp).
And my reading's was 120/125/120/135 PSI.
In MML 12-20-00 page 15 i can read "The compression should be between 9 and 12 bar (130 and 174 psi)."
so my is under this range but later I can read :
"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."
So my (120psi) is over this limit.
Do I have a problem? My engine has 800hrs and I'm not sure it is normal wear or not. Engine work's fine and when I turning prop by hand I can feel better compression than in many other planes.
I'm not sure if its important but during test throttle was closed.
And my reading's was 120/125/120/135 PSI.
In MML 12-20-00 page 15 i can read "The compression should be between 9 and 12 bar (130 and 174 psi)."
so my is under this range but later I can read :
"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."
So my (120psi) is over this limit.
Do I have a problem? My engine has 800hrs and I'm not sure it is normal wear or not. Engine work's fine and when I turning prop by hand I can feel better compression than in many other planes.
I'm not sure if its important but during test throttle was closed.
