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Home >> Suzuki >> 2012 >> Equator Base >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical - Qr25DE >> Repair Instructions >> Engine Unit: Inspection After Disassembly >> Piston To Cylinder Bore Clearance >> Re-boring Cylinder Bore

Re-boring Cylinder Bore

  1. Cylinder bore size is determined by adding piston to cylinder bore clearance to piston skirt diameter.

    Re-bored size calculation: D = A + B - C 

    where, 

    D: Bored diameter 

    A: Piston diameter as measured 

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

    C: Honing allowance 0.02 mm (0.0008 in) 

  2. Install lower cylinder block, and tighten bolts to the specified torque. Otherwise, cylinder bores may be distorted in final assembly. Refer to [ENGINE UNIT: DISASSEMBLY AND ASSEMBLY ] for the tightening procedure.
  3. Cut 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 a 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 cylinder 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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