a) Note the position of the pulley on the shaft so that the pulley can be reinstalled in the same relative position when the
pump is reassembled.
b) Using a suitable puller, remove the pulley (5) from the shaft. Remove ball (3) and pipe plug (4).
c) Remove screws and washers (6) and remove pump cover (7). Discard gasket (8).
d) Press the shaft and bearing assembly, seal the impeller from the pump body as an assembly by applying pressure on
the bearing outer race.
The bearing will be damaged if the pump is dismantled by pressing on the end of the pump shaft.
e) Press the end of the shaft out of the impeller (9) in the direction shown.
f) Remove seal (10) from the pump shaft and discard it.
3-22. Inspection and Repair
a) Clean 1 parts in cleaning solvent, Federal Specification P-D-680, or equivalent.
Pump shaft (11) consists of a permanently sealed and lubricated bearing and shaft assembly and should not be
washed. Wipe the bearing and shaft with a clean, lintless cloth.
b) Discard gaskets and seals. Inspect all parts for signs of wear and replace any parts not in good
c) Examine the impeller for damage and excessive wear on the impeller face which contacts the seal.
Replace the impeller if it is worn or damaged.
d) Discard the bearing if it has a general feeling of roughness, is tight, or shows indications of damage.
a. Refer to figure 3-4. Press shaft and bearing (11) into housing (12) until the outer race of the bearing is flush
with the outer face of the pump housing. Apply pressure only to the outer race of the bearing.
The bearing will be damaged if pressure is applied to the end of the shaft.
b. Lightly coat the outside diameter of the new seal (10) with sealing compound such as Loctite. Then with the
face of the housing and the bearing outer race supported, install the seal by applying pressure on the seal
outer flange, until the flange makes contact with the housing. Wipe the face of the seal with a chamois to
remove all dirt and metal partices.
c. Support the pulley end of the shaft on the bed of an arbor press and press the impeller (9) on the shaft until
the impeller is flush with the large end of the housing.
d. Place the pulley 5) on the bed of an arbor press. Place a suitable rod between the ram of the press and the
impeller end of the shaft. Press the shaft into the pulley until the pulley is in its original position on the shaft.
e. Install a new gasket (8) and cover (7) on the housing. Secure with screw and lock washer (6), tightening the
screws to --7 ft-lb. (8-9 N. m).
Run the pump dry at 1200 rpm for a minimum of 30 seconds to assure satisfactory seating of the seal.
Install plug (4) and ball (3).
Install a new gasket (13) on the flange of the water pump body. Secure the water pump on the oil cooler
housing with screws (1) and lock washers (2).
b. Install the hose between the water pump and water by-pass tube and tighten the hose clamps. Install and
tighten the belts.
c. Close all drain cocks and refill the cooling system. Start the engine and check for leaks.
Section V. REPAIR OF OIL COOLER
The oil cooler is mounted on the lower front engine block. Its purpose is to cool the engine lubricating oil, via coolant from
the engine radiator.
a. Drain the cooling system by opening the drain cock located on the bottom of the oil cooler housing.
Refer to figure 3-5. Remove hose clamps (1) and hose (2). Remove screws (3), lock washer (4), elbow (5)
an gasket (6).
c. Remove screws ) and lock washers (8) Lift the unit from the engine block.
d. If adapter (17) is to be removed, the oil fi!ter must first be removed.
a. Refer to figure 3-5. Remove drain cock (9) and cooler housing (10).
b. Matchmark the end of the oil cooler housing, the cooler core (12) and adapter (17) with a punch or file so
they can be reassembled in the same position.
Remove gasket (11), core (12) and gasket (13),
d. Remove screws (14) and (15), and lock washers (16). Separate adapter (17) from the engine block and
remove gasket (18) and (19). remove gaskets (18) and (19).