0383144 EVINRUDE PISTON ASSEMBLY, (.020) O.S.

1. Governor linkage. 2. Exhaust manifold. 3. Aftercooler. 4. Turbocharger. 5. Alternator. 6. Fan. 7. Fuel injection pump. 8. Fuel filter. 9. Fuel priming pump. 10. Cover for drive gear for fuel injection pump. 11. Housing for water temperature regulator. 12. Air compressor. 13. Inlet manifold. 14. Bracket covering timing pointer for flywheel timing marks. 15. Water pump. 16. Damper. 17. Front engine support. 18. Position for power steering pump. 19. Oil filter. 20. Oil cooler. 21. Information plates.The 3306 Truck Engine is a 4.75 in. (120.6 mm) bore, 6.00 in. (152.40 mm) stroke turbocharged engine. It is available with a watercooled aftercooler. This engine has six cylinders with a displacement of 638 cu. in. (10.5 liters). The firing order is 1, 5, 3, 6, 2, 4.The 3306 Truck Engine uses a Sleeve Metering Fuel System with a shutoff solenoid.The starting system is direct electric and uses a 12 volt starting motor. It can also be equipped with an optional 24 volt system.Fuel System
Introduction
The Sleeve Metering Fuel System is a pressure type fuel system. The name for the system is from the method used to control the amount of fuel in the fuel injection charge. This system has an injection pump and an injection valve for each cylinder. The injection pumps are in the fuel injection pump housing on the right side of the engine. The injection valves are in the precombustion chambers in the cylinder head.Fuel System Timing
An automatic timing advance unit connects the drive sleeve on the end of the camshaft to the timing gears in the front of the engine. The unit changes the timing of the fuel system according to the engine speed to give better combustion of the fuel at all levels of engine operation. The unit in the turbocharged engine changes injection timing from 12° BTC, at 1200 rpm, to 18° BTC, at 2200 rpm. The unit in the turbocharged and aftercooled engine changes injection timing from 8° 30' BTC, at 1200 rpm, to 14° 30' BTC, at 2200 rpm.Water Separator
Some engines have a water separator. The water separator is installed between the fuel tank and the rest of the fuel system. For efficiency in the action of the water separator the fuel flow must come directly from the fuel tank and through the water separator. This is because the action of going through a pump or valves before the water separator lowers the efficiency of the water separator.The water separator can remove 95% of the water in a fuel flow of up to 33 gph (125 liter/hr) if the concentration of the water in the fuel is 10% or less. It is important to check the water level in the water separator frequently. The maximum amount of water which the water separator can hold is 0.8 pt. (0.4 liter). At this point the water fills the glass to 3/4 full. Do not let the water separator have this much water before draining the water. After the water level is at 3/4 full, the water separator loses its efficiency and the water in the fuel can go through the separator and cause damage to the fuel injection pump.Drain the water from the water separator every day or when the water level gets to 1/2 full. This gives the system protection from water in the fuel. If the fuel has a high concentration of water, or if the flow rate of fuel through the water separator is high, the water separator fills with water faster and must be drained more often.To drain the water separator, open the valve in the drain line and the valve at the top of the water separator. Let the water drain until it is all out of the water separator. Close both valves.Fuel Flow With Engine Running
SCHEMATIC OF FUEL SYSTEM
1. Constant bleed valve. 2. Disc. 3. Siphon break orifice. 4. Priming pump. 5. Fuel injection pump. 6. Fuel injection valve. 7. Bleed valve. 8. Fuel return line. 9. Fuel supply line [optional water separator (W.S.) installation is shown by dash lines]. 10. Fuel tank. 11. Fuel filter. 12. Channel. 13. Check valve. 14. Check valve. 15. Housing for the fuel injection pumps. 16. Check valve. 17. Bypass valve. 18. Transfer pump.
FUEL SYSTEM INSTALLED
4. Priming pump. 5. Fuel injection pump. 7. Bleed valve. 11. Fuel filter. 15. Housing for the fuel injection pumps. 19. Shutoff solenoid. A. Connection for fuel supply line (9).
SLEEVE METERING FUEL INJECTION PUMP
4. Priming pump. 5. Fuel injection pump. 7. Bleed valve. 19. Shutoff solenoid. 20. Position for oil pressure shutoff (attachment). 21. Fuel ratio control. 22. Brass screw terminal. 23. Position for measurement of fuel pressure in housing. 24. Filter base. 25. Timing pin in storage position. 26. Drive sleeve. 27. Governor control shaft. 28. Cover for high idle stop and low idle stop. 29. Position for using timing pin. 30. Cover for housing. 31. 2P8315 Bracket Assembly. 32. Transfer pump drain. 33. Inlet for lubricating oil for automatic timing advance unit.When the engine is running, transfer pump (18) pulls fuel from fuel tank (10), through fuel filter (11), and into channel (12) behind cover (30). From the channel, the fuel goes through check valve (13) into the bottom of priming pump (4), through the priming pump, out check valve (14) and into passage (34) in the housing. The fuel in the passage is the supply for transfer pump (18). The output of the transfer pump goes into housing (15).
SLEEVE METERING FUEL PUMP
12. Channel. 30. Cover for housing.The fuel in the housing is the supply for the injection pumps and the lubricant for all the moving parts in the housing. Fuel can go from the housing in three ways.
SLEEVE METERING FUEL PUMP
5. Fuel injection pump. 16. Check valve. 17. Bypass valve. 34. Passage (to transfer pump inlet). 35. Passage to check valve.1. Fuel injection pumps (5) send some fuel to the cylinders during injection.2. Constant bleed valve (1) lets approximately 9 gal./hr. of fuel go back to the fuel tank, through return line (8)