Stern Tube LO temp high / Running Hot 

.stern tube temp high  .stht

Causes : 

1. Sensor faulty or loose connection – check locally.
2. System LO temp high due to —-
3. Cooler dirty – clean cooler
4. Pump pressure low – changeover pump      
5. Filter dirty – changeover to clean one.
6. Poor Quality, insufficient or contaminated LO in the System.
7. Water or Foreign particles in the oil.
8. Excessive vibration, M/E running on critical speed for a long time – Avoid prolong running in critical speed.
9. Axial movement & vibration of shaft due to uneven loading & ballasting – Ensure proper ballasting.
10. Eccentricity of shafting due to bearing wear down.
11. High ambient temp. Aft peak tk / Stern tube cooling water tk empty or less water.
12. Propeller obstructed / unbalance due to broken blade.
13. Uneven Trim / List – correct the Trim / List.

Actions:

1. Check temperature locally and manually by temp gun. Check the level, appearance of oil and cooling line.
2. Inform Master, Bridge if problem is real & Reduce RPM.
3. Start another A/E & keep eye on Boiler steam pressure.
4. Reduce RPM until it cools down.
5. Check Causes for running Hot & take necessary action.
6. Check stern tube cooling water tk level, if less water – fill up tk
7. If System LO temp high due to—-

iv)       Cooler dirty – clean cooler

v)         Pump pressure low – changeover pump

vi)        Filter dirty – changeover to clean one.

• If Uneven Trim / List – correct the Trim / List.
• Avoid prolonged running in critical speed.
• Check drain oil quality.