- Connect the Mitivac vacuum pump to the SAS
control valve.
- Start the vacuum pump up to a pressure of -0.6
÷ -0.8 bar so to close the valve and cut off the SAS
system.
- Remove the exhaust gas collection kit cap and
connect the analyzer adequately pre-heated.
- Check the analyser output and the engine rpm.
- Adjust the CO concentration.
N.B.
CHECK THAT THE RESULT IS OBTAINED
WITH THE VALVE GAS IN CLOSED POSITION.
N.B.
ALSO CHECK THE CARBURETION ADJUST-
MENT IS OBTAINED WITH THE FLOW SCREW
OPEN BETWEEN 2 AND 4 TURNS.
N.B.
OTHERWISE, CHECK THE FUEL LEVEL AD-
JUSTMENT IN THE TANK AND THE FUEL CIR-
CUIT.
N.B.
IN CASE OF UNSTABLE CO, CHECK THAT
THE CARBURETTOR IS CLEAN AND THAT
THE FUEL SUPPLY SYSTEM AND THE DE-
PRESSION SEALS WORK ADEQUATELY
N.B.
IN CASE OF 1000 PPM UNBURNED HYDRO-
CARBONS (HC) >, CHECK THE IGNITION SYS-
TEM, THE TIMING SYSTEM, THE VALVE
CLEARANCE AND THE EXHAUST VALVE
TIGHTNESS.
Specific tooling
020329Y MityVac vacuum-operated pump
020332Y Digital rev counter
494929Y Exhaust fumes analyser
020625Y Kit for sampling gas from the exhaust
manifold
Characteristic
CO Check
3.8±0.7 to 1650±50 RPM
Fly 125 - 150 4T Maintenance
MAIN - 41
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