Chapter 6 N40475 Keel cooling system This engine may be purchased in a form suitable for keel cooling, using two separate coolers, one for the cylinder jacket circuit and one for the aftercooler circuit. Figure 2 shows the connections provided for the coolers. The requirements for each section are as follows: Figure 2 1. Engine 2. Thermostat 3. Fresh water pump 4. Aftercooler 5. Gearbox oil cooler 6. Exhaust manifold 7. Remote tank 8. Cylinder jacket grid cooler 9. Aftercooler grid cooler 10. Auxiliary water pump 11. Integral oil cooler 12. Bleed 13. Part of supplied remote kit Note:
Under extreme conditions the water flow in the jacket circuit may increase to 182 l/min (40 gallons/ min.) The pipework between the engine and coolers should be as short and direct as is possible, but should be sufficiently flexible to allow the engine to move on it’s flexible mountings. The layout should discourage the formation of air locks, and venting points should be provided wherever an air lock is likely to occur. The keel cooling system should normally be filled with a water/antifreeze mixture containing 50% antifreeze. This mixture is necessary even in warm climates, as the anti freeze contains corrosion inhibitors which protect the engine cooling system.
Figure 3 shows the items not supplied with the engine as unshaded. Figure 3 Page 18 Models M190C M216C M250C M300C Cylinder Jacket Circuit Heat rejection /kW. 102 134 146 173 Design value for the water temperature at the exit from the keel cooler /OC. 65 65 65 65 Design value for the water flow through the cooler. *Pipework to suit 45mm (1.75”) bore hose connections /l min-1. 174 201 201 201 Thermostat opening temperature /OC. 85 85 85 85 Aftercooler Circuit (Includes gearbox oil cooler) Heat rejection /kW. 32 36 42 44 Design value for the water temperature at the exit from the cooler /OC. 38 38 38 38 Design value for the water flow through the cooler.
Pipework to suit 32mm (1.25”) bore hose connections /l min-1 119 133 133 133