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ToC 05 COOLING SYSTEM SERVICE MANUAL MARINE ENGINES 05.00. FUNCTIONAL DESCRIPTION COOLING CIRCUIT 05.00.01 Raw water circuit (external cooling circuit) Raw water is fed to the engine via a vane-type pump in the secondary circuit. The raw water pump (ill.1/2) is a self-sucking pump and is driven for 4 cyl. engines via Poly-V-belts and for 6 cyl. engines via V-belt. The impeller is arranged eccentrically. At higher speeds, it acts as combinded centrifugal- and displacement pump. At slow speeds, the impeller acts as displacement pump. This causes a pump effect of the impeller wings during operation of the engine. At high engine speed, the resistance of water on its way through the pump is sufficient to avoid a contact of the impeller wing with the inner side of housing. The wings are only bent inside in direction of impeller center, thus acting as combined centrifugal- and displacement pump. Raw water is fed to the raw water pump via raw water pick-up (ill.1/1) and/or via drive unit (Z-drive, jetdrive) and/or raw water filter (ill.1/11) arranged between. From the raw water pump, water flows into the combined fuel- (ill.1/3) and steering- and/or transmission oil cooler (ill.1/4) where the raw water absorbs thermal energy from the fuel- and steering- and/or transmission oil system. Then water flows through the tube stake of intercooler (ill. 1/5) where the raw water absorbs thermal energy from air charge. Through the connecting line above the rear part of the camshaft case the raw water enters the tube stake of heat exchanger (ill.1/6) where the raw water still absorbs thermical energy from engine coolant. Then raw water flows through the high-riser (ill.1/7) where the raw water still absorbs thermal energy from exhaust gas, and finally leaves, mixed with exhaust gas, the raw water circuit via exhaust pipe (raw water outlet) (ill. 1/9) either through the drive or a muffler, and is blown in below water surface. The splash water flap (ill.1/12) avoids a possible raw water entry with stopped engine. The raw water circuit is equipped with 5 sacrificial anodes (ill.1/10) (for salt water made of zinc; for sea water magnesium anodes are recommended). Temperature of raw water, mixed with exhaust gas, is controlled by means of sensor (ill.1/8) on highriser and transmitted to the electronic management system. If during operation the limit of 60°C is exceeded, the electronic management system will reduce the engine power to a perceptible extent of up to 50%. This disturbance will be indicated on the instrument panel by means of signal lamp for engine check which blinks 2 times/sec. and an audible warner (2times/sec). ATTENTION: To exclude consecutive damages, occured trouble should be analyzed and eliminated as soon as possible. Page COOLING SYSTEM - 2 Z001019/0_6_July 2008
SERVICE MANUAL MARINE ENGINES 05 COOLING SYSTEM 00.01 ill.1 1 Raw water intake 2 Impeller pump 3 Fuel cooler 4 Hydraulic oil- and transmission oil cooler 5 Tube stake - intercooler 6 Tube stake - heat exchanger 7 Hi-riser 8 Sensor exhaust gas temperature 9 Raw water outlet 10 Sacrificial anodes 11 Raw water filter 12 Splash water flap Z001019/0_6_July 2008 Page COOLING SYSTEM - 3
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STEYR MARINE ENGINES 4 CYLINDERS +
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PREFACE STEYR MOTORS GmbH has devel
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05 Cooling system 05.01 Cooler, hea
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