828731 Volvo.Penta Trimmer

ENGINE FOR 120B MOTOR GRADER
1. Water temperature regulator housing. 2. Inlet to radiator. 3. Cylinder head. 4. Cylinder block. 5. Oil filler cap. 6. Inlet to water pump. 7. Water pump. 8. Oil level gauge. 9. Oil filter. 10. Oil cooler. 11. Fuel priming pump. 12. Fuel filter. 13. Exhaust manifold. 14. Fuel injection pump housing. 15. Bleed valve. 16. Starting motor. 17. Governor. 18. Connection for fuel supply line. 19. Governor control shaft. 20. Cover for fuel setting adjustment.The 3306 Vehicular Engine for the 120B Motor Grader is part of a series of 4.75 in. (120.65 mm) bore, 6.00 in. (152.40 mm) stroke in-line engines. This book has the information for this engine.This engine has 638 cu. in. (10.5 litre) displacement. The firing order is 1, 5, 3, 6, 2, 4.The starting system is direct electric and uses a 24 volt starting motor.Sleeve Metering 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
The timing of this 3306 Engine is 13° 30' 1° before TC (top center).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 litre/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 litre). 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. Fuel tank. 2. Fuel supply line to filter. 3. Passage from fuel filter to check valve. 4. Fuel priming pump. 5. Check valve. 6. Fuel injection pump. 7. Fuel injection valve. 8. Bleed valve. 9. Fuel filter. 10. Check valve. 11. Fuel supply line. 12. Housing for the fuel injection pumps. 13. Check valve. 14. Bypass valve. 15. Fuel transfer pump.
FUEL SYSTEM INSTALLED
2. Fuel supply line to filter. 4. Fuel priming pump. 6. Fuel injection pump. 8. Bleed valve. 9. Fuel filter. 11. Fuel supply line. 12. Housing for the fuel injection pumps. A. Connection for the fuel supply line (11).
SLEEVE METERING FUEL INJECTION PUMP AND GOVERNOR
6. Fuel injection pump. 8. Bleed valve. 12. Housing for the fuel injection pumps. 15. Fuel transfer pump. 16. Governor control shaft. 17. Brass screw terminal. 18. Location to check fuel pressure. 19. Timing pin in storage location. 20. Drive sleeve. 21. Location to use timing pin. 22. Fuel transfer pump drain. A. Connection for fuel supply line.When the engine is running, fuel transfer pump (15) pulls fuel from fuel tank (1) through fuel filter (9). From fuel filter (9), the fuel goes through check valve (10) into the bottom of fuel priming pump (4), through the fuel priming pump, out check valve (5) and through fuel supply line (11) to connection (A) on the governor housing. The fuel then goes through passages (B and C) inside the governor housing and the housing for the fuel injection pumps (12) to passage (24). The fuel passage (24) is the supply for fuel transfer pump (15). The output of the fuel transfer pump goes into the housing for the fuel injection pumps (12).
FUEL FLOW THROUGH HOUSINGS
A. Connection for fuel supply line (11). B. Passage. C. Passage.
SLEEVE METERING FUEL PUMP
6. Fuel injection pump. 13. Check valve. 14. Bypass valve. 23. Passage to check valve. 24. Passage (to transfer pump inlet).The fuel in the fuel injection pump housing is the supply for the fuel injection pumps and the lubricant for all the moving parts in the fuel injection pump housing. Fuel can go from the fuel injection pump housing in two ways.1. The fuel injection valves (7) send some fuel to the cylinders during injection.2. The fuel bypass valve (14) keeps the pressure of the fuel in the fuel injection pump housing at 25 to 32 psi (170 to 220 kPa) at 2200 rpm. Fuel which goes through the bypass valve mixes with the fuel flow from the fuel tank in passage (24). From here the mixture of fuel goes through the fuel transfer pump and back into the fuel injection pump housing.Fuel Flow Using The Priming Pump And Bleed Valve
When the priming pump handle is pulled out, negative air pressure in the pump makes check valve (10) open and pulls fuel from the tank. Pushing