220. Gear Cover and Accessory Drive
a. Removal. Remove the engine-compressor (par. 214). Remove the governor (par. 110a), thd distributor (par. 97a),
and the water pump (par. 193). Remove the tachometer drive and front half cover (par. 216a). Remove the fan (par. 88a),
the fuel pump (par. 75a), the shutterstat (par. 81a), and the fan belt (par. 85). Remove the 10 hex head bolts (19, fig. 101)
and lockwashers (18). Disconnect the tube assembly (8), elbow (7) and connector (11). Withdraw the two taper pins (20)
from the bottom of the gear cover (1). Pry the cover slightly to loosen the taper pins. Lift off the gear cover. Watch for the
oil seal half (21). to not let it drop to the floor. Take off the two gaskets (17). The gear cover assembly comes off as a
unit. Do not disassemble unless there is evident damage. To remove the accessory drive housing (6), withdraw taper pin
(10), pull governor drive gear (9), and remove the hex head bolts (18), and lockwashers (15). Carefully pry the gear cover
and housing apart. They are doweled together with taper pins (14). Do not remove the thrust plug (22).
b. Inspection (fig. 101). Replace all taper pins and the two cover gaskets. Inspect the governor drive gear (9) for
worn or broken teeth. Replace a damaged gear. Inspect the accessory drive gear (5). If the gear is worn, or the teeth
cracked or broken, replace the gear. Pull the gear over the woodruff key (16). Press a new gear on the accessory drive
shaft (3) over the key. It is not necessary to remove the pipe plug (4). Inspect the inside surface of the gear cover bushing
(2). If the bushing shows signs of wear, pull out the oil seal (23) and press the bushing out of the cover with an arbor
press (par. 179). Press in a new bushing and install the oil seal. Inspect the drive housing bushings (12). The bushings
(12), gear cover (1), accessory drive housing (6), and thrust plug (22) are not serviced separately. Damage on any one of
these components results in replacing the complete assembly.
c. Installation (fig. 101). Insert the drive shaft (3) into the gear cover (1). Start the two taper pins (14) into the gear
cover. Carefully press the accessory drive housing (6) over the pins. Install the hex head bolts (13) and lockwashers (15).
Put the governor drive gear (9) on the end of the shaft and drive in the taper pin (10). Shellac the two gaskets (17) to the
crankcase. With the oil seal half (21) in position in recess in the bottom of the cover, position the cover against the
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