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Home >> Infiniti >> 2004 >> QX56 RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1200 (Engine Mechanical) >> Cylinder Block >> Inspection After Disassembly >> Piston To Cylinder Bore Clearance >> Reboring Cylinder Bore

Reboring Cylinder Bore

WARNING: This page is about a different car, the 2005 Infiniti QX56. However, it is still accessible from the selected car via links, so may be relevant.
  1. Cylinder bore size is determined by adding piston-to-bore clearance to piston diameter "A".
    1. Rebored size calculation: D = A +B - C 
    2. Where, 
    3. D: Bored diameter 
    4. A: Piston diameter as measured 
    5. B: Piston - to - bore clearance (standard value) 
    6. C: Honing allowance 0.02 mm (0.0008 in) 
  2. Install main bearing caps, and tighten them to the specified torque. Otherwise, cylinder bores may be distorted in final assembly.
  3. Cut the cylinder bores.
    NOTE:
    • When any cylinder needs boring, all other cylinders must also be bored.
    • Do not cut too much out of cylinder bore at one time. Cut only 0.05 mm (0.0020 in) or so in diameter at a time.
  4. Hone cylinders to obtain the specified piston-to-bore clearance.
  5. Measure the finished cylinder bore for out-of-round and taper.
    NOTE: Measurement should be done after cylinder bore cools down.
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