TM 5-3810-288-12
(4) Refer to figure 7-27 and remove the upper hose
(a)
Refer to figure 7-21 and remove the
connected between the thermostat housing and the
water temperature senders.
(b) Loosen the heater inlet hose clamp and
radiator.
(5) Refer to figure 7-25 and remove the lower radiator
remove the heater inlet hose from the
hose connection.
water manifold (fig. 7-29).
Note. The radiator must b adequately braced during
(c) Remove the two hose damps from the
ends of the water manifold hose.
removal.
(d) Remove the locknuts and copper
(6) Refer to figure 7-28 and remove the radiator
washers which secure the manifold to
mounting nuts, lockwashers, plain washers, shock
the cylinder heads. Remove the water
mounts, and stud spacers. Remove the radiator
manifolds and manifold hose as an
braces. Using a suitable lifting device, remove the
assembly. Replace the manifold
radiator.
gaskets when reinstalling the manifolds.
c. Radiator Cap.
(2) Replacement.
(1) Test. The radiator cap is rated at 7 to 13
(a) Refer to figure 7-29 and replace the
psi. If the cap is suspected of leaking, and
water manifolds and lines.
failure to maintain this pressure, test it on a
(b) Refer to figure 7-27 and replace the
cap tester if available.
thermostat, thermostat housing and
(2) Replacement. If the cap is suspected of
lines.
leaking and no radiator cap pressure tester
(c) Refer to figure 7-21 and install water
is available, unscrew the radiator cap (fig. 7-
temperature senders.
f.
Water Pump.
13 psi.
(1) Removal. Before removing the water pump,
d. Thermostat and Housing.
drain the radiator through the drain cocks
(1) Removal. Drain the coolant below the level
illustrated in figure 7-25. Then proceed as
of the thermostat housing (fig. 7-27) before
follows:
removing the thermostat housing. Refer to
(a) Refer to figure 7-25 and disconnect the
heater return hose. Loosen the hose
cocks. Then re-move the thermostat
clamps and remove the lower radiator
housing and lines as follows:
hose.
(b) Remove the oil cooler hose (fig. 7-30)
by loosening the two hose damps.
(a) Remove upper radiator hose and
(c) Six bolts secure the water pump to the
attaching hose damps.
timing gear portion of the crankcase.
(b) Remove water pump line by removing
Four of these bits enter the water pump
attaching capscrews and lockwashers.
from the radiator end of the engine. Two
(c) Remove the locknuts. capscrews and
of these bolts are longer than the other
copper washers which secure the
two and are used to secure the water
thermostat housing to the water manifold
pump belt guard in position in front of
and remove the thermostat housing.
the water pump sheave. Support the
Replace the thermostat housing gasket,
water pump, refer to figure 7-31 and
and remove the thermostat. The
remove the six water pump housing
thermostat is located in the front end of
bolts, including the two which secure the
the thermostat housing.
belt guard. Remove the belt guard.
(d) There are two short bolts which secure
the thermostat. Replace a faulty thermostat
the water pump housing to the timing
and reinstall the thermostat housing as
cover. These bolts are located behind
described above.
the water pump housing. Remove these
e. Water Manifold.
two bolts.
(1) Removal. Drain the coolant below the level
(e) Refer to figure 7-31, loosen the jam nut,
of the water manifold. Remove the
and back off the water pump belt
thermostat and thermostat housing as
adjusting screw. Slip the water pump
described in above. Then remove the water
belt off the pump sheave. The water
manifold as follows:
pump sheave is held in place by a
locknut and washer arrangement
identical to the arrangement shown on
the idler sheave. Re-
7-35
