SERVICE MANUALWATER PUMP, THERMOSTAT & IDLER PULLEYSSection 9WATER PUMPThe belt-driven centrifugal pump is built into the frontcover but can be removed when service is necessary.Water Inlet and outlet passageways are cast into thecover.Coolant from the lower tank of the radiator enters thefront cover near the bottom and flows to the center of thepump Impeller through the upper channel. Upon leavingthe Impeller, the coolant enters the lower channel whichdivides the flow. Part of the flow travels Pack down tothe lower end and enters the oil cooler as shown in figureone. After flowing through the cooler, It re-enters theupper channel to mix with the incoming coolant from theradiator.The other part of the pump flow enters the distributionpassageway cast In the crankcase. The passagewaydirects coolant from the front to the rear of thecrankcase, evenly distributing the coolant, to the lowersections of each cylinder sleeve. The coolant enterseach sleeve chamber on a tangent causing It to swirlaround the sleeve as it travels upward and into the head.This swirling of the coolant aids In preventing sludge andrust accumulations, which greatly reduce coolingefficiency.Coolant directors (2, Fig. 2) in the cylinder head waterpassages direct the coolant for scrubbing the valve seatareas and nozzle tubes, as shown. Two air bleed holes(1) vent the crankcase into the cylinder head coolantpassages.The coolant flowing out of the cylinder head enters thethermostat housing. Here the coolant Is either directedto the radiator If at operating temperature or directedback to the pump if not at operating temperature.Figure 2. - Coolant Passages In Cylinder Head and Crankcase1. Air Bleed Holes2. Coolant DirectorCGES-185-3PRINTED IN UNITED STATES OF AMERICAPage 2
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