N38143 Chapter 4 Keel cooling connections - 4GM and 4TGM Figure (D) shows the connections and flow. Connections sizes are both 38mm (1.5 inches). 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Connections Flow Keel cooler Engine oil cooler Fresh water pump By pass Engine Thermostat Exhaust manifold Header tank Page 21