2.
Adjust the idle speed adjustment screw to obtain from 550 to 650 RPM. Rotate the screw clockwise to increase the speed of the engine; counterclockwise to decrease the engine speed. The screw is located on the throttle arm.
— Note —
One complete revolution of the carburetor idle screw provides a variation of approximately 100 RPM in idling speed.
73-10-00 Page 73-6 Issued: April 1, 1997
3G20
ENGINE PRIMER INSTALLATION. (Refer to Figure 73-2.)
High pressure electric pumps are used for engine priming.
ELECTRIC PRIMER.
— Note —
The electric fuel pumps must be on to operate the electric primers.
The priming system uses high pressure electric pumps mounted in each wing and solenoid controlled primer valves. Each system is operated by switching on the appropriate electric fuel pump thus supplying fuel to the engine driven pump. Fuel for the primer system is fed through the engine driven pump to the primer solenoid valve. With fuel pressure available, the primer button is depressed, actuating the primer solenoid valve, and allowing fuel to flow through the lines to the primer jets in the intake of the number 1, 2 and 4 cylinders.
PRIMER JETS.
1.
To remove the primer jets, disconnect the supply line from each jet. With a deep socket and light pressure, remove the jet from the cylinder.
2.
To clean the jet, soak in carbon remover solution long enough to loosen any dirt and blow clean with air pressure. Do not use sharp objects or wire brush to clean the jet tube.
3.
Install the jet finger tight to assure that the threads are not crossed and then torque 60 inch-pounds. Align and install the fuel supply lines, tighten to a snug fit.
— Note —
If fuel stoppage continues after the primer jets are cleaned, check for blocked supply lines and bent or collapsed walls.
73-10-00 Page 73-7 Revised: February 28, 2002
THE NEW PIPER AIRCRAFT, INC.
PA-44-180
AIRPLANE MAINTENANCE MANUAL
73-10-00 Page 73-8 Revised: February 28, 2002
3G22
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73-10-00 Page 73-9 Revised: February 28, 2002
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73-10-00 Page 73-10 Revised: February 28, 2002
3G24
CONTROLLING.
ADJUSTMENT OF THROTTLE, MIXTURE AND CARBURETOR HEAT CONTROLS. (Refer to Figure 73-3)
1. Throttle: With the engine throttle control at full throttle position, rig quadrant throttle lever to provide a
0.030 to 0.060 inch cushion from forward stop. Adjust the throttle as follows:
A. Disconnect the clevis end of the throttle control cable from the control arm at the carburetor. Loosen the jam nut that secures the clevis end.
B. Adjust the linkage by rotating the clevis end of the cable to obtain 0.030 to 0.060 inch cushion on instrument panel stop when in full throttle position.
C. Reconnect the clevis end to the control arm and safety.
2. Mixture: With the engine mixture control at full rich position, rig quadrant mixture lever to provide a
0.030 to 0.060 inch cushion from forward stop. Adjust the mixture as follows:
A. At the carburetor, disconnect the clevis end of the mixture control cable from the control arm. Loosen the jam nut that secures the clevis end.
B. Adjust the linkage by rotating the clevis end on the cable to obtain a 0.030 to 0.060 inch cushion from the instrument panel stop when in full rich position.
C. Reconnect the clevis end to the control arm and safety.
3.
Check security of cable casing attachments.
4.
Pull the throttle and mixture cockpit levers full aft to ensure that the carburetor idle screw contacts its stop and the carburetor mixture control arm contacts its lean position.
5.
Adjust the carburetor heat control as follows:
A. Position the air box valve in the full cold position and the cockpit control 0.16 inch below the cold detent.
B. The air box valve must be in the full heat position when the cockpit control is in the hot position.
73-20-00 Page 73-11 Issued: April 1, 1997
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73-20-00 Page 73-12 Issued: April 1, 1997
3H2
INDICATING.
FUEL PRESSURE GAUGE.
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