roubleshooting Symptoms Charts
B3.9 and B5.9 Series Engines
Section TS - Troubleshooting Symptoms
Coolant Temperature Above Normal Gradual Overheat (Continued)
Inspect the shroud and the recirculation
baffles. Repair, replace, or install, if necessary.
Fan shroud is damaged or missing, or the air
Refer to Procedure 008-038 and the OEM
recirculation baffles are damaged or missing
ooling system pressure cap is not correct, is
Inspect the pressure cap. Refer to Procedure
malfunctioning, or has a low-pressure rating
Verify the concentration of antifreeze in the
coolant. Add antifreeze or water to correct the
oolant mixture of antifreeze and water is not
concentration. Refer to Cooling System
Specifications in Section 8.
Check or replace the temperature gauge. Refer
emperature gauge malfunction
to the OEM service manual.
Check the thermostat for the correct part
number and for correct operation. Refer to
Procedure 008-013. Make sure thermostat is
hermostat is not correct or is malfunctioning
vented properly. Refer to Application Engineer-
ing Bulletin, AEB 90.24.
cooling system. Refer to Procedure 008-019.
Check fill rate to see if it not being exceeded.
Check for inlet restriction or aeration. Check
system discharge or outlet pressure. Check the
ea water pump is malfunctioning (marine
sea water pump impeller for damage. Refer to
lugged or restricted heat exchanger (marine
coolant passages. Refer to Procedure 008-053.