(9) Inspect the oil seal for wear or deterioration. Replace a defective oil seal.
e. Reassembly.
(1) Install the camshaft thrust plunger button (14, fig. 37) in the gear cover (4).
(2) Install the pipe plug (8) in the gear cover (4).
(3) Install the dowel pins (11) in the gear cover (4).
(4) Press the oil seal (9) in the gear cover (4).
f. Installation.
(1) Position the gasket (1) and spacer (2) on the crankcase and install the lockwashers (10) and
capscrews (12).
(2) Position the idler gear (10, fig. 38) on the idler gear shaft (11) and press the idler gear shaft into the
crankcase.
(3) Install the screw (15) in the crankcase.
(4) Position the camshaft gear (5) on the camshaft (1) and install the lockwashers (6) and capscrews
(7).
(5) Position the gasket (3, fig. 37) and cover (4) on the spacer (2) and install the lockwasher (10) and
capscrews (13).
(6) Install the lockwashers (10) and capscrews (7) securing the gasket (3) and cover (4) to the
crankcase.
(7) Install the engine oil drain plug and fill the engine with oil as specified in LO 5-3825-221-15.
(8) Install the governor (para. 76).
(9) Install the magneto assembly (para.87d).
(10) Install the flywheel and flywheel housing (para. 68).
(11) Install the canopy (para. 68).
132. External Oil Lines
a. Removal.
(1) Remove the nut (21, fig. 17) securing the oil filter inlet line and remove the line.
(2) Remove the nut (16) securing the oil filter outlet line (17) and remove the line.
(3) Remove the nuts securing the crankcase pressure line and remove the line.
b. Cleaning, Inspection, and Repair.
(1) Clean the outside of the lines with an approved cleaning solvent.
(2) Blow out the inside of the lines with compressed air.
(3) Inspect the lines for kinks, cracks, or breaks. Replace a damaged line.
(4) Inspect the nuts and flares for cracks. If the line is long enough, cut off the damaged end, replace
the damaged nut, and reflare the end of the line. Cut off a damaged flare andreflare.
c. Installation.
(1) Secure the crankcase pressure line with the two nuts.
(2) Secure the oil filter outlet line with the two nuts (16).
(3) Secure the oil filter inlet line with the two nuts (21).
133. Engine Oil Pan and Pump Assembly
a. Description. The oil pan is of one-piece sheet metal construction. The gear-type oil pump driven from
the idler gear in the timing gear train, draws oil from the crankcase oil sump through its filter screen. It delivers
the oil under pressure to an oil header which sprays oil against the connecting rod cap fins for rod bearing
lubrication, and directs oil through exterior lines to the governor and bypass oil filter. The cylinders are
lubricated by the mist resulting from the connecting rod cap lubrication. Splash plates, installed inside the
crankcase, prevent excess lubrication of the cylinder walls.
b. Removal.
(1) Remove canopy (para. 68).
(2) Remove the flywheel and flywheel housing (para. 68).
(3) Remove the engine and pump assembly from the water distributor (para.122).
(4) Remove the oil drain plug and drain the oil into a suitable container.
(5) Remove the timing gear cover (para.131b).
(6) Remove the fourteen capscrews and lockwashers (15, fig. 31) securing the oil pan and gasket to
the engine crankcase.
AGO 6871A
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