Figure 8-35. Sectional View of Altitude Compensating Fuel Pump Assembly
g. Adjustment for Full Power Performance: (Refer to Figure 8-35.)
CAUTION
Before attempting full power checks, be sure that the brakes are properly
maintained and set, and that the ground conditions will not permit the
wheels to slip during full power check.
NOTE
Fuel flows are given for sea level density altitude.
1. Set the engine at 40.6 to 40.9 in. Hg manifold pressure (overboost light activated) and engine at
2575 ± 25 RPM. Readjust the throttle as required to maintain 40.6 to 40.9 in. Hg manifold.
2. Fuel flow should be 23.0 to 23.5 gallons per hour (gph), with the mixture controls in the full rich
position.
3. If adjustment is required, loosen the jam nut on the adjusting screw located on the aneroid housing
of the fuel pump. (Refer to Figure 8-35, item 2.) Clockwise adjustment decreases fuel flow
reading; counterclockwise adjustment increases fuel flow reading; one full turn will cause a 1.0 to
1.5 gph change. Use CAUTION when loosening and tightening the jam nut so as not to change
settings or over torque the am nut.
NOTE
If other than minor adjustments are required to the fuel flow, a complete
investigation of interface systems is required.
Revised 12/11/78
2C8
CHEROKEE ARROW III SERVICE MANUAL
POWER PLANT - CONTINENTAL
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