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Rudder clearances

 Pintle 

  • For a ship in service, Maximum allowable clearances between Pintle and bush is 6 mm.  
  • IF the actual clearance exceeds 6mm, the bush should be renewed. 
  • Measured using the thickness gauge. The clearance is taken in four sides: forward, aft, port, and starboard. 
  • The measurements are taken through the inspection cover, usually on the port side. 
  • The normal clearance is about 1 to 2 mm.  

Neck bush clearance

  • Between the rudder stock and the neck bush (rudder stock upper side) is measured using the thickness gauge. 
  • The clearance is taken in four sides: forward, aft, port, and starboard. 
  • The measurements are taken from top of the rudder. 
  • The normal clearance is about 1 to 2 mm. 

Jumping Clearance:

  • The designed clearance is 2.0 mm maximum. 
  • If the clearance measured is found to be large, it can be concluded that the rudder has moved down.
  • The clearances can be taken from rudder trunk – between the stopper and carrier bearing

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