MAINTENANCE/ADJUSTMENTS
THERMOSTART SYSTEM
184579
Method of Operation TRIM THIS EDGE
Turn the key to the START position and crank the engine for 10 seconds. Return the key to the RUN position. Depress and hold the coldstart rocker switch for 20 to 25 seconds. Turn the key to the START position to start the engine. During the heat cycle, a nichrome wire element heats the fuel control valve in the flamestart device. Differential expansion of the valve components cause the valve to open. When the engine is cranked, the transfer pump fuel pressure causes a small amount of fuel to leak through the valve and flow over the heating element. The element is hot enough to ignite the fuel and this preheats the incoming air. After the engine starts, the incoming air cools.
Checking the System 1. Check the electrical connection to the thermostart unit to be sure it is clean (located in the intake manifold). 2. Start the engine while cold, using the thermostart and quickly shut the engine off. If the unit is working correctly, the thermostart unit should be warm. 3. If the thermostart unit also makes a distinctive “pop” as the fuel coming through the thermostart ignites. Check this by listening at the rear of the machine while another person presses the thermostart switch. (The key switch must be in the ON position without actually starting the engine). If there is no “pop” the thermostart is not working and should be replaced. 4. If the thermostart is leaking it will cause black smoke in the exhaust, erratic running and increased fuel consumption. If you suspect this, run the engine for a few minutes and then shut it off. Remove the thermostart unit from the inlet manifold and look for traces of wet fuel. 180
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