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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical - Qr25DE >> Cylinder Block >> Inspection After Disassembly >> Piston To Cylinder Bore Clearance >> Reboring Cylinder Bore

Reboring Cylinder Bore

  1. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter "A".

    Rebored size calculation: D = A + B - C 

    D: Bored diameter 

    A: Piston diameter as measured 

    B: Piston-to-bore clearance (standard value) 

    C: Honing allowance 0.02 mm (0.0008 in) 

  2. Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted in final assembly.
  3. Cut cylinder bores.
    • When any cylinder needs boring, all other cylinders must also be bored. 
    • Do not cut too much out of cylinder bore at a time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time  .
  4. Hone cylinders to obtain specified piston-to-bore clearance.
  5. Measure finished cylinder bore for out-of-round and taper.
    • Measurement should be done after cylinder bore cools down  .
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