(12) Remove the tapered pin (8) securing the flyweight hub (4) to the drive shaft (3).
(13) Remove the fittings from the housing (1).
d. Cleaning.
(1) Clean all parts wih an approved cleaning solvent and dry thoroughly with compressed air.
(2) Remove all gasket residue from the mounting surfaces.
(3) Remove all corrosion or rust from all exterior surfaces.
e. Inspection and Repair.
(1) Inspect all bearings for smooth operation and signs of cracks, chipped, or worn balls or races.
Replace all damaged bearings as necessary.
(2) Inspect the casting for cracks, breaks, nicks, burrs, or corrosions. Smooth all nicks or burrs and
rough surfaces. Remove all corrosion. Replace a broken casting.
(3) Inspect the governor drive shaft for scoring or wear and replace a defective drive shaft.
(4) Slide the driver gear bushing on the drive gear and check for loose fit. A sliding fit is a correct
installation. Inspect the bushing for wear or any other damage and replace as necessary.
(5) Check the ends of the hardened pins on the flyweights for wear or roughness and replace both
flyweights if either is defective.
(6) Inspect the yoke for wear or deterioration and replace as necessary.
(7) Inspect the lever shaft bearing and preformed packing for wear or deterioration and replace as
necessary.
(8) Inspect the governor gear for cracked or chipped teeth and replace as necessary.
(9) Inspect the hardware and remaining parts for stripped threads, cracks or any other damage and
replace as necessary.
f. Reassembly.
(1) Install the fitting in the housing (1).
(2) Position the flyweight hub (4) on the drive shaft (3) and secure with tapered pin (8).
(3) Position the flyweights (5) on the flyweight hub (4) and install the lock-pins (9).
(4) Slide the thrust sleeve (14) on the drive shaft (3) and install the thrust-pins (12).
(5) Slide the bearing (6), yoke (13) and bearing (7) on the drive shaft (3).
(6) Position the drive shaft (3) and attaching parts in the housing (1).
(7) Position the bearing (17) and preformed packing (18) on the shaft and lever (19).
(8) Slide the shaft and lever (19) through the yoke (13) and install the tapered pin (20).
(9) Install the bearing (17) and expansion plug (16) in the housing (1).
(10) Install the tachometer adapter and cap on the housing (1).
(11) Install the oil line fitting in the housing (1).
(12) Position the gasket (2) on the housing (1).
(13) Place the woodruff key (21) in the drive shaft (3) and slide the gear (10) and shaft bearing (11) into
position.
Section V. ENGINE
131. Timing Gear Cover and Accessory Drive Assembly
a. Description. The timing gear cover and accessory drive assembly is located at flywheel end of the
engine. The gear train consists of six gears: A crankshaft gear, driving the camshaft gear and governor gear;
an idler gear driving the magneto and oil pump gears.
b. Removal.
(1) Remove the canopy (para. 68).
(2) Remove the flywheel and flywheel housing (para. 68).
(3) Remove the magneto assembly (para.87c).
(4) Remove the governor (para. 76).
AGO 6871A
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