cold temperatures. Extremely hot intake air reduces
engine performance.
Quality of the air
– The engine may be exposed to
extended operation in an environment that is dirty or
dusty, unless the equipment is cleaned regularly.
Mud, dirt, and dust can encase components.
Maintenance can become very difficult. The buildup
can contain corrosive chemicals.
Buildup
– Compounds, elements, corrosive
chemicals, and salt can damage some components.
Altitude
– Problems can arise when the engine is
operated at altitudes that are higher than the
intended settings for that application. Necessary
adjustments should be made.
Incorrect Operating Procedures
• Frequent hot shutdowns
• Operating at excessive loads
• Operating at excessive speeds
• Operating outside the intended application
Incorrect Maintenance Procedures
• Extending the maintenance intervals
• Failure to use recommended fuel, lubricants, and
coolant/antifreeze
i06554405
Speed Sensor - Clean/Inspect
(Engine Speed Sensor and
Overspeed Sensor)
When the engine is cranked, small metal particles
are produced. These particles will contaminate the
magnetic end of the overspeed sensor.
Contamination will distort the signals that are
produced by the sensors. The sensor should be
regularly cleaned and adjusted to ensure a good
signal.
Table 20
Required Tools
Tool
Part Number
Part Name
Qty
A
SE253
Crankshaft Turning Tool
1
Overspeed Sensor
The overspeed sensor is located in the left-hand side
of the flywheel housing.
1.
Isolate the electrical supply to the engine.
Illustration 68
g01237853
Typical example
2.
Remove the connection (3). Loosen the locknut
(1).
3.
Remove the sensor (2).
4.
Use a soft, dry cloth to clean any debris from the
sensor (2).
Note:
Do not use a wire brush to clean the sensor.
Do not use abrasive material to clean the sensor.
5.
Install Tooling (A). Use Tooling (A) to rotate the
engine. Rotate the engine to align a tooth on the
ring gear with the center of the tapped hole.
6.
By hand, carefully install the sensor (2) until light
contact is made with the ring gear.
Note:
Do not tighten the sensor.
80
SEBU9077-01
