A Series Diesel Engine Troubleshooting Logic 33
Coolant Temperature Above Normal (Continued)
Cause Correction
Malfunctioning Temperature
Sensor/Gage
Verify that the Gage and Temperature
Sensor are Accurate.
Refer to Pages 55
OK
Malfunctioning, Incorrect or No
Thermostat
Check/Replace the Thermostat.
Refer to Page 60, 65
OK
Air in the Cooling System
Make Sure the Fill Rate is not Being
Exceeded and the Correct Vented
Thermostat is Installed. Refer to Page 55
OK
If Aeration Continued, Check for a
Compression Leak Through the Head
Gasket. Refer to Page 116
Malfunctioning Water Pump
Check/Replace the Water Pump.
Refer to Page 58, 64
OK
Incorrect Injection Pump Timing
Check/Time the Injection Pump.
Refer to Page 77
OK
Incorrect External Injection Pump
Timing
Verify Pump Timing Marks are Aligned.
Refer to Page 77, 83
OK
Over fueled Injection Pump
Replace the Injection Pump.
Refer to Page 94
OK
(Continued)
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