GENERAL SERVICE INFORMATION Engine Piping Diagrams Figure 3-7 Cooling Flow (2) (3) (1) (4) (6) (7) (5) (12) (9) (13) (8) (11) (10) Figure 3-7 0006511 Note: Typical 4BY2 engine shown. 6BY2 is similar. 1 – Seawater Supply 2 – Seawater Pump 3 – Hydraulic Oil Cooler 4 – Charge Air Cooler 5 – Engine Heat Exchanger 6 – Exhaust Seawater Mixing Elbow 7 – Exhaust / Seawater Exit 8 – Engine Coolant Pump 9 – Thermostat 10 – Engine Oil Cooler 11 – Engine Coolant Passages 12 – Coolant Recovery Tank 13 – Water Cooled Exhaust Manifold 3-10 BY Service Manual © 2009 Yanmar Marine International