Excessive Fuel Consumption - Perkins 1106D Troubleshooting Manual

62
Troubleshooting Section
•
Damaged cylinder head
3. Perform all necessary repairs.
4. Ensure that the repairs have eliminated the faults.
5. If the fault is not eliminated, refer to the
Troubleshooting Manual for your engine
application.

Excessive Fuel Consumption

Probable Causes
• Fuel quality
•
Quality of oil
•
Low engine temperature
• Prolonged operation at idle speed
•
Engine operating speed
•
Air intake and exhaust system
• Reduced pressure of intake air
•
Excessive valve lash
•
Failure of the primary speed/timing sensor
Recommended Actions
Fuel Quality
1. The quality of the fuel that is used in the engine
will affect the rate of fuel consumption. Refer to
"General Fuel Information" in the Operation and
Maintenance Manual, "Refill Capacities".
2. If the fuel is not of an acceptable quality, drain
the fuel system and replace the fuel filters. Refill
the fuel system with fuel of an acceptable quality.
Refer to the applicable sections in the Operation
and Maintenance Manual.
3. If the fuel is of an acceptable quality, refer to
"Quality of Oil".
Quality of Oil
1. The nominal viscosity of the lubricating oil that
is used in the engine will affect the rate of fuel
consumption. The viscosity of lubricating oil is
defined by the SAE grade of the lubricating oil.
The grade of the lubricating oil must be correct
for the ambient conditions. Lubricating oil that is
intended for use in high ambient temperatures
will have a negative effect upon the rate of fuel
consumption in cold ambient temperatures. Refer
i02414537
to "Engine Oil" in the Operation and Maintenance
Manual, "Refill Capacities".
2. The actual viscosity of the lubricating oil that is
used in the engine will change throughout the
service life of the oil. Lubricating oil that is heavily
contaminated will have a negative effect upon the
rate of fuel consumption.
3. If the oil is not of an acceptable quality or if the
oil has exceeded the service life, drain the oil
system and replace the oil filters. Refill the oil
system with oil of an acceptable quality. Refer
to the applicable sections in the Operation and
Maintenance Manual.
4. If the oil is of an acceptable quality, refer to
"Operation in Cold Conditions".
Low Engine Temperature
1. The operating temperature of the engine will affect
the rate of fuel consumption. Operation of the
engine below the correct temperature will increase
fuel consumption. Failure of the water temperature
regulator can prevent the engine from operating at
the correct temperature.
2. If the engine operating temperature is low, check
the operation of the water temperature regulator. If
the water temperature regulator does not operate
correctly, a new water temperature regulator must
be installed. Refer to Disassembly and Assembly,
"Water Temperature Regulator - Remove and
Install".
Prolonged Operation at Idle Speed
Prolonged operation of the engine at idle speed
increases fuel consumption.
When the engine is operated at idle speed, the fuel
that is consumed provides no useful work. Prolonged
operation at idle speed will cause a measurable
deterioration in the overall fuel consumption of the
engine.
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