Posted by Ron in Nebr on September 11, 2014 at 06:46:35 from (70.198.42.27):
In Reply to: 450D operation? posted by thdrduck on September 11, 2014 at 05:15:38:
The other answers are right, and I'll add to them to help you better understand how it works.
As mentioned, the selector lever on the left side switches the engine from gas to diesel.
When it is put in the gas position, like mentioned below, it opens a small valve in each cylinder that bleeds off some compression. It also activates a switch in the intake manifold that supplies power to the ignition coil, and releases the float in the carburetor to let gasoline run into the carb.
The carb on these does not have a throttle to control engine speed. It is meant to only run at a fast idle to get the engine warm enough to fire on diesel. There is a choke for cold starting.
The throttle lever on the tractor controls the injection pump like on any diesel, except for the fact that at it's lowest setting it effectively shuts the diesel fuel off completely.
After the engine has started and run a minute or two on gas, the selector lever is pulled to diesel while at the same time the throttle lever is moved to allow diesel fuel to be injected. When the selector lever is pulled to the diesel position, it closes the starting gas valves in the head for higher compression, shuts off electrical power to the coil(or grounds the magneto if so equipped), and pushes the carb float down to shut off the gasoline flow.
Then the tractor is run on diesel until you are ready to shut it down. These MUST be allowed to idle for several minutes to cool down after use. Some people switch back to gas to cool down, some just idle at the slowest speed on diesel, and then close the throttle to kill the engine.
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