21. State about stern tube sealing with forward simplex shaft seal type.

1.     Clamp ring

2.     Forward chrome steel liner

3.     “O” ring

4.     Cover ring

5.     Sealing ting (No 4,5)

6.     Intermediate ring

7.     Flange ting

8.     Packing

9.     Stern tube

10.  Aft bulkhead

* The forward seal is of a construction almost similar to the aft seal, except that it is composed of two sealing rings.

* The sealing rings are numbered No.4 and No.5 from the side of stern tube

* No.4 sealing ring seals tight the lubricating oil inside the stern tube while No.5 sealing ring seals tight the lubricating oil in the oil chamber between No.4 and No.5 sealing rings. The forward liner is tightened with bolts to the split - type clamp ring mounted to the propeller shaft