Throttle Valve Lift

Throttle valves will be slightly opened by vacuum governor on carburetor when engine is coasting with oil temperature over 62°F, engine speed in excess of 2000 RPM and coolant temperature below 212°F. Whenever governor is not subjected to vacuum, throttles will be held slightly open. Whenever switch-over valve is deactivated, vacuum will be supplied to governor and throttle valve will return to idle position. This will occur under the following conditions: Below 62°F oil temperature, oil temperature switch will close. Above 212°F coolant temperature, coolant temperature switch will close. With engine speed below 1800 RPM, RPM switch will open.