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| Illustration 1 | g00519397 |
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(1) Engine oil pressure sensor
(2) Coolant temperature sensor (3) Coolant level sensor (4) Magnetic speed pickup | |
Engine oil pressure sensor (1) is optional. The sensor is mounted on the side of the engine. After the engine is started, the alarm is activated for insufficient oil pressure. The alarm is also activated if the engine loses oil pressure. No resetting is required.
Coolant temperature sensor (2) is located in the water temperature regulator housing. High coolant temperature closes the coolant temperature switch. Once the coolant temperature switch is closed, an alarm is activated. No resetting is required. The switch opens as the coolant cools.
Coolant level sensor (3) is mounted near the top of the expansion tank. The sensor detects the coolant level. If the coolant drops below a minimum level, the coolant level sensor will activate an alarm. Overheating or possible engine damage can be avoided when the coolant level sensor is activated. Coolant must be added to the expansion tank in order to reset the condition.
Magnetic speed pickup (4) is mounted in the flywheel housing. The magnetic pickup measures engine rpm by sensing the passage of the ring gear teeth of the flywheel. The engine rpm is indicated on the tachometer.