TM 5-3810-300-24&P-3
WATER PUMP 5.1
Fig. 6-Water Pump Details and Relative Location of Parts
available as an assembly only and includes the carbon
washer, seal, ring, guide, and the spring. A seal
3. Support the impeller end of the pump body on an
assembly is also included with a service replacement
arbor press, and insert the coupling end of the shaft and
impeller.
bearing assembly into the pump body. Then, press
against the outer race of the bearing until the bearing
Examine the studs in the pump body. If it is necessary to
contacts the shoulder in the pump body. Stake the end
replace a stud, use a good grade of sealant on the
of the pump body in three places to prevent the bearing
threads and drive the stud in to 6-8 lb-ft torque.
from moving endwise.
The service replacement pump body includes the studs
4. With the surface of the water seal clean and free
and an insert.
from dirt and metallic particles, apply a thin coat of liquid
soap on the inside diameter of the rubber seal. Do not
scratch or mar the surface of the carbon seal washer.
Assemble Water Pump
Slide the seal assembly on the pump shaft until the
Refer to Figs. 1 and 6 and assemble the pump as
carbon seal washer is seated firmly against the pump
follows:
body insert. Then, install the spring with the small end
1. If a new steel insert is to be used in the pump body,
toward the seal.
make sure the counterbore in the pump body is
thoroughly clean before installing a new insert. Dirt in the
5. On early pumps place the impeller on the shaft with
counterbore can cause misalignment between the insert
the pin hole in the shaft aligned midway between two
and the carbon washer and result in a leak at this point.
adjacent blades of the impeller.
Start the counterbored end of the insert into the pump
6. Support the bearing end of the shaft (not the driven
body. Then, press the insert in until it contacts the
coupling) on the bed of an arbor press. Then press the
shoulder in the pump body. The insert has a .0015"-
impeller on the shaft. On current engines the end of the
.0035" press fit in the pump body.
shaft must be flush with the face of the impeller hub with
the bearing being held against the shoulder in the water
CAUTION: Do not mar the highly finished seal
pump body. On former engines which have the end of
contact surface of the insert when pressing it
the shaft tapered, use impeller installer J 21971 (Fig. 7),
into the pump body.
to press the impeller on the shaft until the distance from
the face of the pump body to the face of the impeller hub
2. Install the water slinger on the pump shaft with the
is .052"-.072", with the bearing being held against the
flange of the slinger approximately 3/16" from the end of
shoulder in the water pump body.
the outer race of the bearing.
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