Chapter 4 N38143 Keel cooling connections - 4.4GM and 4.4TGM These engines do not have a header tank as part of the engine package, but have a remotely mounted ex pansion tank. Figure (E) shows the connections and flow. Connections sizes are both 38mm (1.5 inches). 1. 2. 3. 4. 5. 6. 7. 8. 9. Connections Flow Keel cooler Remote tank Fresh water pump Thermostat Engine Integral engine oil cooler Exhaust manifold Page 22