BUSHING 7T5216 - Caterpillar

Use this procedure if one of the following event codes is active. Refer to Troubleshooting, "Event Codes" for information about event codes and the default trip points for these codes. You must access the monitoring system on Caterpillar Electronic Technician (ET) in order to view the current trip points for these codes.
Table 1
Event Code    
Description    Conditions which Activate the Code    System Response    
E337(1) High Engine Oil to Engine Coolant Diff Temp     The engine oil temperature is too high or the engine coolant temperature is too low. The differential between the engine oil temperature and the engine coolant temperature has exceeded the trip point and the delay time has expired.     The alarm output is activated. The code is logged.    
E337(3) High Engine Oil to Engine Coolant Diff Temp     The shutdown output is activated. The code is logged. Note: The cylinder liner and the piston assembly can be damaged by this condition.Probable Causes
High engine oil temperature or low engine coolant temperature
Faulty temperature sensor(s)
Faulty water temperature regulatorsRecommended Actions
Check the Engine Oil Temperature and the Engine Coolant Temperature
Observe the temperature of the engine oil and the engine coolant on the control panel's display.If the engine oil temperature is high, refer to Troubleshooting, "Oil Temperature Is High".If the temperature of the engine coolant is low, refer to Troubleshooting, "Coolant Temperature Is Low".Check the Temperature Sensors
Use a separate device to measure the temperatures of the engine oil and the engine coolant. Compare the measured temperatures to the readings on the control panel's display.If a reading is incorrect, switch the suspect sensor with a sensor that is known to be good. Verify that the problem is solved.Check the Water Temperature Regulators
The water temperature regulators should not begin to open until jacket water reaches opening temperature for the regulators. Allow the engine to cool and then start the engine. Check the tube at the outlet for the jacket water. If the tube is warm and normal operating temperature is not achieved yet, a regulator may be stuck open.Check the water temperature regulators according to Systems Operation/Testing and Adjusting, "Cooling System". Replace the water temperature regulators, if necessary.