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20 Cards in this Set
- Front
- Back
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Where is the stern tube located?
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Aft of the prop shaft hull penetration in the stern tube
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Where is the strut bearing located?
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located in the struts that are the structural members extending from the hull to support the waterborne shafting
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What ships have class I and class III stern tube and strut bearings and what do they consists of?
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Ships with shafts 6 inches in diameter or greater. These bearing consists of a split bearing shell with dovetail grooves running lengthwise along the inside of the bearing shell. Synthetic rubber strips, called staves, are mounted in the grooves and provide the bearing wear surface. The staves are either metallic-backed, Class I, or non-metallic-backed, class III.
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What ships have class II and class IV stern tube and strut bearings and what do they consists of?
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Used on ships with shafts smaller than 6 inches in diameter. Class II bearings are internally molded rubber staves bonded to a metallic backing. Class IV bearings are intenally molded rubber staves bonded on a non-metalic backing.
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What does stave-type stern tube and shaft bearings rely on for lubrication and cooling?
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seawater
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What are the 3 forms of lubrication that occur under normal operation?
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-Boundry lubrication
-Mixed-film lubrication -Hydrodynamic lubrication |
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During ______ ______ friction and wear are at their highest, It occurs at startup and when shaft speed is decreased?
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Boundry lubrication
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During ______-______ ______, the shaft and bearing surfaces cease to come in contact. It is important during the bearing break-in period. during this period, shaft and bearing surfaces high spots are polished?
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Mixed-film lubrication
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During normal operating shaft speeds, a film of seawater separates the propulsion shafting and the bearing surface. Full seperation is called ______ ______. It allows small particles to pass through the bearing lubricant film without damaging the bearing or shaft surfaces?
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Hydrodynamic lubrication
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What are the 2 means strut bearing staves is supplied with cooling water?
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Natural flow and pumping
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A level ____ inspection is conducted for shaft bearing inspections?
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a Level 2 inspection
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At what position are clearance measurements taken?
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At the 3, 6, 9, and 12 o'clock positions
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When a hydrolance is not available what should be used to clean the stave gaps?
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A 3/16" diameter, solid flexible rod about 12 feet long.
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What may clicking/squealing noise indicate?
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May indicate loose bearing staves, especially if it varies with shaft RPM (increases or decreases).
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What may dragging/grinding noise indicate?
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May indicate wire from wire-guided torpedos wrapped around the shafting. Ascertain if wire-guided torpedo operations occured.
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Historically, what are the most common results of submarine aft stern tube bearing noise?
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Mud and debris cloging the water passage ways
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From what direction should you hydrolance?
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From inside the mud tank to flush all debris out of the stern tube and the boat.
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Bearing stave clearance measurements should be taken at a depth of ___ to ___ inches in from each stave end?
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4 to 6 inches in from each stave end.
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What is the purpose of taking bearing stave clearance measurements?
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To determine the bearing wear rate and projected remaining bearing life.
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On CG 47 class ships where are bearing clearance measurements taken?
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Measurement is taken between the shaft and the bearing stave retaining ring.
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