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 relative position (in front of ferrule) slide the new seal
e. Cleaning, Inspection, and Repair.
assembly over the shaft (8). Be sure that seal ring is snugly
CAUTION
in the ferrule and gripping the shaft as it moves into position.
Do not wash bearing (7). Wipe clean for
The marcel (wavy) washer part of the assembly is then moved
inspection with a slightly dampened lint
up against the flatwasher.
free cloth.
(5) Compress the impeller blades enough to clear
(1) Wash remaining parts in clean fuel oil and
the cam (9) in housing, as the impeller is pressed on the
blow dry.
splined shaft (8).
(2) Inspect bearing by holding inner race and
NOTE
revolve outer race slowly to detect possible wear or rough
Splined plugs are part of the impeller
spots. Replace a bearing that is worn, or does not roll freely.
and are designed to reduce the
(3) Examine all components of the seal assembly
possibility of foreign material working its
(11). Replace the assembly when felt washers or seals are
damaged or defective.
way into splines, resulting in excessive
(4) Examine seal contact surfaces of the shaft.
wear.
Polish minute scratches away with crocus cloth dampened
(6) Move impeller several revolutions in the
with fuel oil.
direction of normal rotation, in order that blade will be
(5) Inspect impeller to assure the bond between
positioned correctly.
neoprene and metal is good. If the impeller blades have a
(7) Install new gasket (26) and cover (25) on
permanent set, replace the impeller.
pump housing (12), then secure with screws (24).
(6) Inspect wear plate (10) for burrs. Remove
c. Removal. Remove the raw water pump as described
burrs. If wear on plate seems excessive, it may be reversed
when the pump is reassembled.
d. Disassembly.
f. Reassembly. Assemble by reversing procedure in d.
(1) Remove the impeller and seal assembly (c.
above.
above).
NOTE
(2) Mark housing (12) and adaptor (19) for
reference at reassembly, then remove capscrews (13) and
Lubricate lips of seals at installation, and
lockwashers (14) and separate housing from the adaptor.
install with lip toward bearing. If the seal
(3) Clamp the drive gear (4) in a soft-jawed vise
is spring loaded, the lip faces the
and remove nut (17) and lockwasher (18) from shaft (8).
impeller. When installing nut (17) on
(4) Remove gear from vise, then, using a suitable
shaft (8), it must be tightened to a torque
puller, remove gear (4) from shaft (8). Remove the key (22)
of 25-30 ft lb.
Do not exceed the
from the shaft (8).
specified torque.
(5) Slide seal (5) and felt washer (6) from
g. Installation.
Install according to instructions in
housing.
NOTE
Certain pumps, marked with letter X
5-23.
Exhaust Manifold, Pipes, and Muffler
stamped on pump housing between the
a. General.
The one piece, water-cooled exhaust
port flanges, have been assembled
manifold is cast with an integral water jacket surrounding the
without the outer bearing seal (5). When
exhaust chamber. The diameter of the exhaust chamber
overhauling one of these pumps, the
increases uniformly from one end to the other where it
outer seal can continue to be omitted at
terminates in a flange to which an elbow and flexible exhaust
connection is attached. A portion of the engine coolant is
reassembly.
bypassed from the water manifold into the rear end of the
(6) Remove ring (20) from groove in housing.
jacket, and is discharged from the forward end through a tube
(7) Support housing (12) in arbor press with
into the lower section of the expansion tank of the heat
mounting flange resting on bed of press, and splined end of
exchanger. A draincock with an attached hose is installed in
shaft under the ram. Using a brass rod between shaft and
bottom of the manifold for draining the water jacket. A plug is
ram, press shaft and ball bearing (7) from the housing.
provided in the bottom of the exhaust outlet elbow for draining
(8) Remove slinger (23) from shaft, or housing.
moisture condensed from the exhaust gases.
(9) Remove felt washer (6) and seal (5) (not
shown) from shaft, or housing.
(10) Remove ring (21) from groove in shaft (8),
the exhaust manifold.
then using an arbor press and a suitable sleeve against the
c. Cleaning, Inspection, and Repair.
inner race of bearing (7), press bearing off threaded end of
(1) Inspect internal walls for corrosion and scale,
shaft.
and gasket surfaces for grooves, or burrs.
(11) Remove bolt (15) and lift cam (9) from the
(2) Clean away all scale, using a solvent
housing.
comparable to Fed Spec P-D-680, or the alternate method
(12) Lift wear plate (10) off dowel pin.
described for core of heat exchanger in
5-75
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