CHAPTER 1: INTRODUCTION TM 9-2350-256-201-16 COOLING SYSTEMa.AIR COOLINGNOTEThe following callouts are found in Figure 1-9.Air for cooling enters the engine compartment through the grille doors. The top of the engine is shrouded and enclosestwo gear-driven, axial-flow cooling fans (1) which draw the air through the cylinder fins and oil coolers and discharge thehot air vertically from the shroud. Sheet metal baffles and deflectors direct the flow of cooling air across the cylinders.The cooling fans (1) are attached to hubs and are mounted on shafts which are driven by the engine-driven fan driveclutch assembly.The fan drive shaft and gear shift are driven by a horizontal drive shaft.The fan clutch is oil cooled. The fan clutch drive and driven disks are loaded by the centrifugal action of clutch balls andsprings housed in the clutch assembly. The balls and springs are in the driven member and apply upward force to theclutch disks. The clutch oil enters the fan drive vertical shaft from the fan drive housing through an annular groove in theshaft. The depth of the groove controls the amount of oil flow. The oil flows through a central hole in the shaft to adistributor where it is dispersed to the two ball bearings and the clutch disks. The oil moves between the clutch disks bycentrifugal action and drains back through the fan drive housing into the engine oil pan. The fan clutch is designed to slipunder deep water fording conditions where the resistance of the water exceeds the friction of the clutch.Figure 1-9. Cooling Systemb.OIL COOLINGTwo engine oil coolers (2) and two transmission oil coolers (3) are mounted on the sides of the engine above thecylinders. The cooling fans (1) draw air through the oil cooler cores to cool the oil being circulated within the coolers.1-17ELECTRICAL SYSTEMS AND CIRCUITSa.CHARGING/STARTING SYSTEM AND VEHICLE BATTERIES1Engine generator. The generator is an air-cooled, 28V, dc-rated, 300-A, field-regulated unit. It is mounted on theright side of the engine near the flywheel end, and is gear driven by the engine. An integral blower, an air intakeduct, and an outer boot and duct provide a means of cooling the generator. The electrically operated blower drawsair from the crew compartment, forces it through the generator, and exhausts it upward through an outlet near theright camshaft gear housing.1-24
Integrated Publishing, Inc. - A (SDVOSB) Service Disabled Veteran Owned Small Business