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68
Maintenance Section
Speed Sensor - Clean/Inspect
Environmental Factors
Ambient temperatures – The engine may be
exposed to extended operation in extremely
cold environments or hot environments. Valve
components can be damaged by carbon buildup if
the engine is frequently started and stopped in very
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 be 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
•
Extended operation at low idle
•
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
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 crankshaft position sensor and
the overspeed sensor. Contamination will distort
the signals that are produced by the sensors. The
sensors should be regularly cleaned and adjusted in
order to ensure a good signal.
Table 24
Tool
A
Engine Speed Sensor
The crankshaft position sensor is located in the right
hand side of the flywheel housing.
1. Isolate the electrical supply to the engine.
Illustration 66
Typical example
2. Remove the connection (3). Loosen the locknut
(1).
3. Remove the sensor (2).
4. Use a soft, dry cloth in order to clean any debris
from the sensor (2).
i02461940
Note: Do not use a wire brush in order to clean the
sensor. Do not use abrasive material in order to clean
the sensor.
5. Install Tooling (A). Use Tooling (A) in order to
rotate the engine. Rotate the engine in order 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.
Required Tools
Part
Part Name
Number
SE253
Crankshaft Turning Tool
SEBU8191-01
Qty
1
g01237852
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