Engine Systems DETROIT DIESEL 4. Start the engine and check for leaks. When an engine has run out of fuel, there is a definite procedure to follow for restarting the engine. Fuel Tank 1. Fill the fuel tank with the recommended grade of fuel oil. If only partial filling of the tank is possible, add a minimum of ten gallons (38 litres) of fuel. Refill the fuel tank at the end of each day’s operation to prevent condensation from contaminating the fuel. MOTE: A galvanized steel tank should never be used for fuel storage because the fuel oil reacts chemically with the zinc coating to form powdery flakes which quickly clog the fuel strainer and filter and damage the fuel pump and injectors. 2.
Remove the fuel strainer shell and element from the strainer cover and fill the shell with fuel oil. Install the shell and element. 3. Remove and fill the fuel filter shell and element with fuel oil as in Step 2. 4. Start the engine. Check the filter and strainer for leaks. Engine Out of Fuel NOTE: In some instances, it may be necessary to remove a valve rocker cover and loosen a fuel pipe nut in order to bleed trapped air from the fuel system. Be sure the fuel pipe is retightened securely before replacing the rocker cover.
The problem in restarting the engine after it has run out of fuel stems from the fact that after the fuel is exhausted from the fuel tank, fuel is then pumped from the primary fuel strainer and sometimes partially removed from the secondary fuel filter before the fuel supply becomes insufficient to sustain engine firing. Consequently, these components must be refilled with fuel and the fuel pipes rid of air in order for the system to provide adequate fuel for the injectors. Primer J 5956 may be used to prime the entire fuel system. Remove the filler plug in the fuel filter cover and install the primer. Prime the system. Remove the primer and install the filler plug.
In the scavenging system used in two-cycle engines and illustrated in Fig. 5, a charge of air, forced into the cylinders by the blower(s), sweeps all of the exhaust gases out through the exhaust valve ports, leaving the cylinders filled with fresh air for combustion at the end of each upward stroke of the pistons. This air also helps to cool the internal engine parts, particularly the exhaust valves. At the beginning of the compression stroke, each cylinder is filled with fresh, clean air which provides for efficient combustion. The blower(s) supplies fresh air required for combustion and scavenging.
The hollow three-lobe rotors are closely fitted into the blower housing(s) which is bolted to the cylinder block. The revolving motion of these rotors pulls fresh air through the air cleaner or silencer and provides a continuous and ‘uniform displacement of air in each combustion chamber. The continuous discharge of fresh air from the blower creates a pressure in the air box (air box pressure). Fig. 5 - Air intake System Through Blower and Engine Page 16