Electric Primer; Primer Jets; Throttle, Mixture And Carburetor Heat Controls Adjustment - Piper PA-44-180 SEMINOLE Maintenance Manual

ELECTRIC PRIMER (PA-44-180, s/ns 4495001 and up).
The electric fuel pumps must be on to operate the electric primers.
The PA-44-180 priming system, installed on s/ns 4495001 and up, makes use of 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
b u tton 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.
Should further fuel stoppage of the primer system exist, check for blocked supply
lines and bent or collapsed walls.
CONTROLLING.
ADJUSTMENT OF THROTTLE, MIXTURE AND CARBURETOR HEAT CONTROLS. (PA-44-180,
s /n's 44-7195001 thru 44-8195026, and PA - 4 4 - 1 8 0 T, s / n 's 44-8107001 and up.) (Refer to Figure 73-5,
Sheet 1 of 2.)
Throttle and mixture controls are adjusted so that when the throttle arm on the carburetor is rotated for-
ward against its full throttle stop and the mixture control is rotated forward against its full rich stop, the cockpit
control levers of the throttle and mixture should have a 0.030 inch spring back on instrument panel stop when
in full throttle or full rich position.
1. Adjust the throttle as follows:
A. At the carburetor, disconnect the clevis end of the throttle control cable from the control arm.
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 spring back
on instrument panel stop when in full throttle position.
C. Reconnect the clevis end to the control arm and safety.
2. 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 0.030 to 0.060 inch spring
back on the instrument panel stop when in full rich position.
C. Reconnect the clevis end to the control arm and safety.
PIPER AIRCRAFT
PA - 4 4 - 1 8 0 / 1 8 0 T
AIRPLANE MAINTENANCE MANUAL
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— Note —
3F9
73-20-01
Page 73-06
Revised: June 20, 1995