Rigging Throttle, Mixture And Governor Controls; Engine Setup Procedures; Power Plant (Continental) - Piper ARROW III Service Manual

8-59. ENGINE AND PROPELLER CONTROLS.
8-60. RIGGING THROTTLE, MIXTURE AND GOVERNOR CONTROLS. (Refer to Figure 8-33.)
a. Rig the throttle control as follows:
1. Place the quadrant throttle lever full forward.
2. With the control arm on the fuel-air control unit in the full throttle position. rig the throttle
quadrant lever to provide a minimum of .032 inches clearance from the forward stop. With the
control arm at the idle stop, the quadrant throttle lever must have a minimum clearance of .032
inches from the aft stop.
3. Rig the aft throttle micro-switch to actuate the gear warning horn and red light at a manifold
pressure of 14 ± 2 inches with the landing gear retracted.
b. Rig the propeller control as follows:
1. Place the propeller control lever full forward.
2. With the propeller governor control arm in the low pitch (high RPM) position, rig the quadrant
control lever to provide .047/.032 inches clearance from the forward stop.
c. Rig the mixture control as follows:
NOTE: Check the routing and security of the mixture cable to prevent interference between the cable and
the gear linkage.
1. Place the mixture control lever full forward.
2. With the mixture control arm on the engine fuel pump in the full rich position, rig the quadrant
mixture lever to provide a minimum of .032 inches clearance from the forward stop.
3. With the mixture control arm at idle cut-off, the quadrant mixture lever must have a minimum of
.032 inches clearance from the aft stop.
8-61. ENGINE SETUP PROCEDURES. The following procedures should be used to check and adjust the
power plant to maintain the required operating limits and insure obtaining good setup results. It is important
that the following leak check be made before proceeding with any actual system adjustments:
a. Leak Check - Gauge Lines:
1. Disconnect the manifold pressure, deck pressure, and fuel pressure lines on the forward side of the
rear engine baffle.
2. Connect surgical tubing to the fuel flow (deck pressure) bulkhead fitting and evacuate the line until
a 10 gallon per hour (maximum) positive indication on the fuel flow gauge is obtained. Clamp off
the tubing and observe the gauge for a steady reading. Any change of this reading would indicate a
leak in the system, which must be repaired prior to continuing with the setup procedures.
NOTE: A static system test unit can be-used to leak check these lines.
3. Check the fuel pressure and manifold pressure lines in the same manner as given in Step 2, except
apply positive pressure to the lines. Do not exceed 4 pounds per square inch (psi) on the fuel
pressure gauge, or 4 inches of mercury (In. Hg) increase on the manifold pressure gauge.
4. Visually inspect manifold pressure, deck pressure and fuel pressure lines forward of the engine
rear baffle for general condition which could cause leakage. Check all "B" nuts for tightness.
5. Reconnect the manifold pressure, fuel flow and fuel pressure lines at the bulkhead fitting.
6. Disconnect the main fuel supply line to the engine driven fuel pump, at the rear engine baffle and
using the auxiliary fuel pump, pump out approximately one quart of gasoline; then reconnect the
line.
7. Using the electric fuel boost pump, purge the air from the fuel flow gauge line at the back of the
instrument; then reconnect the line.
Revised: 02/27/04
CHEROKEE ARROW III SERVICE MANUAL
2C5
POWER PLANT - CONTINENTAL