Saturday, November 30, 2019

Ovality of auxiliary engine crank pin

  • Combined effect of reduced effectiveness of L.O and directional thrust of the con rod. This is maximum at around 45 degree ATDC Uneven loading of units and overloading 
  • Max Allowed: 1/4th of the bearing clearance  Removed By: Insitu Grinding and polishing  
  • Reference: Fillet of crank web Max. Allowed Grinding: 2mm, because after grinding 2mm or more surface hardness reduces drastically. Due to this maximum allowable grinding is 2mm. Bottom bearing damage reason is the ovality, bearing clearance and condition of L.O supply

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