TM 9-6115-604-34
NAVFAC P8-633-34
d.
Inspect.
(1)
Inspect the gear (23, Figure 7-1) for cracked, chipped, or scored teeth. Replace the gear in accordance
with step e, below, if the teeth are cracked or chipped, or scored.
(2)
Inspect the shaft (25) as follows:
(a)
Inspect the splines for cracking, chipping, or distortion.
(b)
Check the bushing journals for scoring, and check the outside diameter of the bushing journals.
(c)
Replace the shaft in accordance with step e, below, if the splines are cracked, chipped, or distorted,
if the journals are scored deeper than 0.003 inch (0.08 mm), or if the journal diameter is less than
1.748 inch (44.40 mm).
(3)
Inspect the support (29) for cracks, loose bushings (28) or evidence that the bushings have turned in their
bores. If the support is damaged, replace both the support and bushings.
(4)
Inspect the bushings (28) for scoring, and measure the inside diameter. Replace the bushings in
accordance with step e, below, if the bushings are scored deeper than 0.003 inch (0.08 mm), or worn larger
than 1.755 inch (44.58 mm).
(5)
Replace the thrust bearings (22 and 24) and the clamping washer (21) if they are visibly worn, or scored
deeper than 0.003 inch (0.08 mm).
(6)
Inspect the splines in the coupling (14) for damage. If defective, replace both the coupling and the snap
wire (15).
e.
Repair.
(1)
Replace worn bushings (28, Figure 7-1) using an arbor press and bushing drivers. Line bore the new
bushings to an inside diameter of 1.751 to 1.754 inch (44.48 to 44.55 mm).
(2)
Replace the gear (23) on the shaft (25) using an arbor press. Press the replacement gear on the shaft until
it bottoms against the shaft shoulder.
f.
Assemble. During assembly, lubricate all parts with lubricating oil MIL-L-9000.
(1)
Coat the expansion plug (26, Figure 7-1) and pipe plug (27) with a light coating of sealant MIL-S-45180, or
equivalent, and install them in the support (29).
(2)
Place the thrust bearing (24), steel side towards support (29), over the shaft (25), and position it against the
gear (23). Install the shaft and gear assembly into the support (29).
(3)
Install the thrust bearing (22), steel side towards support (29), over the shaft (25). Install the clamping
washer (21), chamfered side towards support (29), and secure with the retaining ring (20).
(4)
Check the shaft end clearance using a feeler gage between the gear (23) and thrust boss on the support
(29). If the clearance is not between 0.002 and 0.012 inch (0.05 and 0.30 mm), replace the thrust bearings
(22 and 24).
g.
Install.
(1)
Using a new gasket (19, Figure 7-1), install the drive unit on the timing gear housing using the lockwashers
(18), and capscrews (16 and 17). Tighten the capscrews to 30 to 35 pound-feet (41 to 47 newton meters).
(2)
Install the coupling (14) on the shaft (25).
(3)
Install the water pump in accordance with the Operator and Organizational Maintenance Manual.
SECTION II. RADIATOR
7-6. GENERAL. Coolant leaves the engine thermostat housings and enters the upper inlet tank of the radiator. Engine
driven, fan-forced air cools the coolant as it travels down through the radiator cores to the outlet tank at the bottom of the
radiator. Coolant is drawn out of the radiator by the engine water pump. A sight glass on the upper radiator tank allows
visual inspection of coolant level while the engine is running.
7-5
