COOLANT FOR AIR COMPRESSOR

TM-5-3805-263-14P-2 Grader Heavy Road Motorized Type I Nonsectionalized Type II Sectionalized Manual
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COOLING SYSTEM SYSTEMS OPERATION TM 5-3805-263-14&P-2 The internal bypass (10) has another function when the cooling system is being filled. It lets the coolant go into cylinder head (6) and cylinder block (7) without going through water pump (9). Radiator (2) has a pressure relief cap or a relief valve and filler cap. The pressure relief cap or valve keeps the pressure in the cooling system from getting too high when the engine is running. It also lets air come into the system when the pressure in the system is less than atmospheric. tors into cylinder head (6). The water directors send the flow of coolant around the valves and the pas- sages for exhaust gases in cylinder head (6). The coolant goes to the front of cylinder head (6). Here water temperature regulator (4) controls the direc- tion of the flow. If the coolant temperature is less than normal for engine operation. water temperature regulator (4) is closed. The only way for the coolant to get out of cylinder head (6) is through internal bypass (10). The coolant from this line goes into water pump (9) which pushes it through the cooling system again. The coolant from internal bypass (10) also works to prevent cavitation (air bubbles) in the coolant. When the coolant gets to the correct temper- ature. water temperature regulator (4) opens and coolant flow is divided. Most of the coolant goes through the radiator (2) for cooling. The remainder goes through internal bypass (10) to water pump (9). The amount of the two flows is controlled by water temperature regulator (4). NOTE: The water temperature regulator is an im- portant part of the cooling system. It divides coolant flow between the radiator (2) and the internal bypass (10) as necessary to maintain the correct operating temperature. If the regulator is not installed in the system. there is no mechanical control and most of the coolant will follow the path of least resistance thru the internal bypass (10). This will cause the engine to overheat in hot weather. In cold weather, even the small amount of coolant that goes thru the radiator (2) is too much and the engine will not get to normal operating temperature. Water Pump The centrifugal-type water pump has two seals. One prevents leakage of water and the other prevents leakage of lubricant. An opening in the bottom of the pump housing allows any leakage at the water seal or the rear bearing oil seal to escape. Fan The fan is driven by two V-belts, from a pulley on the crankshaft. Belt tension is adjusted by moving the clamp assembly which includes the fan mounting and pulley. COOLANT FOR AIR COMPRESSOR The coolant for the air compressor (2) comes from the cylinder block through hose (3) and into the air compressor. The coolant goes from the air compressor through hose (1) back into the front of the cylinder head. 1-19

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