Section 6 - Engine

3.   Disconnect wiring harness from clips—one on each side of the radiator support, and three across rear face of core top tank. Pull wiring harness back toward engine out of the way.
4.   Remove the four (4) bolts attaching the core band to the support—two on each side, top and bottom. Remove air cleaner from carburetor (to permit laying the core straight back hori­zontally).
5.   Move the fan blade so the wide spacing be­tween blades is at the sides, to prevent inter­ference at the core outlet connection when re­moving the core. Grasp the core at the top tank and lift straight up until the outlet connection contacts the support cross brace, then lay the core straight back horizontally to thread the outlet connection past the cross brace, Fig. 101.
Installation of the core is the reverse of the fore­going procedure.
1-1/2-Ton Truck Radiator Core Removal
The ends of the bearing are sealed to retain the lubricant and prevent dust and dirt entering.
The shaft and bearing are retained in the hous­ing by a metal cap which is a press fit on the hous­ing. The thrust washer has two lugs which fit into two slots in the end of the rotor. One side of the thrust washer bears against the ground thrust sur­face of the pump housing and the other against the seal. The rubber seal bears against the ma­chined surface on the inside of the rotor and also against the thrust washer. A coil spring mounted inside, and an integral part of the seal, maintains a constant pressure against the thrust washer and rotor, assuring a positive seal. An air vent in the top of the housing and drain holes in the bottom prevent any water seepage past the thrust washer entering the bearing.
1.   Raise the hood and hold it in the up position
by its brace.
2.   Remove the two bolts attaching the radiator brace to the radiator support, then loosen the brace rod nuts at the dash. Raise the brace rod when core is lifted out.
Drain the cooling system and remove all hose connections.
Remove the four bolts attaching the fan to the water pump pulley, remove the fan.
Remove the headlamp wiring from the clips
along the top of the radiator.
Remove the bolts attaching the radiator core to the support. These bolts are located at the sides of the radiator just inside the fender skirt.
Push the fan shroud to one side and thread it past the bolt attaching the radiator support brace, then lift it upward.
The radiator core may now be removed in ex­actly the same manner as the fan shroud.
Replacement of the radiator core is the reverse of the removal operations.
WATER PUMP Construction
The water pump. Fig. 102, is the ball bearing type and requires no care other than to make cer­tain the air-vent in the top of the housing and the drain holes in the bottom do not become plugged with dirt or grease.
The shaft and the double-row ball bearing are integral. The bearings are packed with a special high-melting point grease at the time of manufac­ture and require no further lubrication.
Fig. 102—Cross-Section of Ball Bearing Water Pump
The water pump itself is not interchangeable with previous models other than 1941, due to the fact that it has two water outlets and is 1/4" longer than models prior to 1941.
The four-blade fan is bolted directly to the water pump pulley, which is driven by the crankshaft pulley by means of a "V" type endless fan belt. The spacing of the fan blades is based on the well known harmonic principle and reduces noise to a minimum. These two pairs of blades set up vibra­tions of different frequencies, each canceling or dampening out the other.





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