11 August, 1998
a) Thoroughly clean the surfaces of the hub and the rear/mounting face of the propeller. Carefully examine each surface and especially examine the splines in the hub area. Even minor nicks or burrs must be smoothed.
b) Make sure the propeller attaching bolts, and the threads in the retaining nuts are clean and dry.
c) Be certain that the hub is not attached to the engine. If it is, make sure the magneto switch is off, and that both magnetos are grounded before removing.
a) Insert the A437 bushings in the propeller's counterbores.
b) Locate the propeller on the hub flange with reference to the blade position with the keyway. Refer to the airframe or engine manufacturers documentation for proper positioning of the propeller on the hub flange.
c) Insert the bolts through propeller holes, counterbore side, and place a washer on the threaded end which will extand past the front of the propeller face. Hand thread the nut onto the end of the bolt until tight.
d) Torque the attaching bolts according to the torque decal on the side of the propeller hub. If the decal is not present refer to the chart below. Apply torque in small increments, working diagonally across the bolt circle until reaching the recommended torque.
| ATTACHING BOLT DIAMETER | RECOMMENDED WRENCH TORQUE |
|---|---|
 |
|
| 3/8 inch | 23 to 25 lb-ft (280 to 300 lb-in) |
| (31.6 to 33.9 newton-meters) | |
| 7/16 inch | 40 to 45 lb-ft (480 to 540 lb-in) |
| (54.2 to 61.0 newton-meters) | |
| 1/2 inch | 60 to 65 lb-ft (720 to 780 lb-in) |
| (81.3 to 88.1 newton-meters) |
 |
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