4 cylinders + 6 cylinders 4 cylinders + 6 cylinders - Steyr Motors

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ToC 05 COOLING SYSTEM SERVICE MANUAL MARINE ENGINES 05.00.02 Closed coolant from cooling circuit (internal engine cooling circuit) In the closed (primary) cooling circuit of the engine, the coolant circulates by centrifugal pump (circulating pump) mounted at the front of motorblock. The belt pulley of the pump is driven from the back of the timing belt. The pump is maintenance-free. The engine coolant in the closed circuit of the cooling system circulates as follows: The circulating pump (ill.2/1) of the engine feeds the coolant through the oil cooler (ill.2/2) where thermal energy is absorbed from motor oil. Then the coolant flows through the water jacket (ill.2/3) into the motorblock. Coolant circulates around the <strong>cylinders</strong>. Here, thermal energy of combustion is absorbed. Then coolant reaches the exhaust manifold (ill.2/4), flows through the exhaust manifold in a separate channel and absorbs thermal energy from exhaust gas. For most of 6 cyl. marine engines (excluded 256H), coolant additionally flows through the exhaust turbocharger (ill.2/5). Here, thermal energy is also absorbed from exhaust gas. Then the coolant reaches the thermostat housing. By means of thermostat, depending on the engine's operating temperature, the coolant is fed to the heat exchanger or directly to the engine coolant pump. If the engine has not yet achieved the operating temperature of 80°C, the thermostat remains closed and the coolant is fed via contact-channel directly to the intake side of coolant pump. This circulating circuit (ill.2/A) is continued until the coolant in the thermostat housing (ill.2/6a) has achieved the temperature (80°C). As soon as the temperature of 80°C in the thermostat housing is achieved, the thermostat opens and the coolant is partially (thermostat opens according to operating temperature) transmitted to the heat exchanger (ill.2/B). Via the contact-channel the coolant partially arrives directly at the intake-side of the coolant pump (ill.2/A). Only after the coolant in the thermostat housing has achieved a temperature of 90-93°C, the thermostat (ill.2/6b) is completely open. From this time, the whole coolant flows through the tube stake of heat exchanger (ill.2/7) in the exhaust manifold housing. Here, the warmed up coolant releases thermal energy to the raw water circuit, and the coolant is fed via engine water pipe to the centrifugal pump again. The heat exchanger is an integrated component of the aluminium exhaust manifold. This component also includes the expansion tank (ill.2/9) with coolant reservoir, required for the pressure system. Operating pressure is regulated via excess-pressure valve (opening pressure 0,9 bar) in the cooler cap (ill.2/10). Coolant temperature is measured by means of sensor (ill.2/11) on exhaust manifold next to drain cock (ill.2/12) of coolant, and transmitted to the electronic management system. If during operation the limit (107°C) is exceeded, the electronic management system will reduce the engine power to a perceptible extent of up to 50%. This disturbance is indicated on the instrument panel by an audible warner (2 times/sec.). ATTENTION: To avoid consecutive damages, occured trouble should be analyzed and eliminated as soon as possible. Page COOLING SYSTEM - 4 Z001019/0_6_July 2008
ToC SERVICE MANUAL MARINE ENGINES 05 COOLING SYSTEM B Circuit thermostat open 00.02 ill.2 1 Circulating pump 2 Oil cooler 3 Water jacket, block/cylinder 4 Water cooled exhaust manifold 5 Turbocharger 6a Thermostat (closed) A Circuit, thermostat closed 6b Thermostat (open) 7 Tube stake - heat exchanger 8 Water-intake pipe 9 Expansion tank 10 Filler cap 11 Coolant temperature sensor 12 Drain plug Z001019/0_6_July 2008 Page COOLING SYSTEM - 5
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STEYR MARINE ENGINES 4 CYLINDERS +
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PREFACE STEYR MOTORS GmbH has devel
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TABLE OF CONTENTS (MAIN ASSEMBLY GR
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05 Cooling system 05.01 Cooler, hea
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4 cylinders + 6 cylinders 4 cylinders + 6 cylinders - Steyr Motors

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