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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 3 (Engine Mechanical - 3.5L) >> Cylinder Block >> Inspection >> Piston-To-Bore Clearance

Piston-To-Bore Clearance

WARNING: This page is about a different variant/trim than selected.
  1. Using a bore gauge, measure cylinder bore for wear, out-of-round and taper. The X axis is in the longitudinal direction of the engine.

    Cylinder bore inner diameter 

    Fig 1: Cylinder Bore Inner Diameter Table
    G02110771Courtesy of NISSAN MOTOR CO., U.S.A.
    Fig 2: Checking Cylinder Bore Inner Diameter
    G02110772Courtesy of NISSAN MOTOR CO., U.S.A.

    If it exceeds the limit, rebore all cylinders. Replace cylinder block if necessary.

    1. Out-of-round (Y-X) : limit 0.015 mm (0.0006 in) 
    2. Taper (C-A) : limit 0.015 mm (0.0006 in) 

    Fig 3: Measurement Points For Checking Cylinder Out-Of-Round & Taper
    G02110773Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Check for scratches and seizure. If seizure is found, hone it.
    • If both cylinder block and piston are replaced with new ones, select piston of the same grade number punched on cylinder block rear position. These numbers are punched in either Arabic or Roman numerals. 
    Fig 4: Locating Stamp Marks On Cylinder Block
    G02110774Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Measure piston skirt diameter.
    1. Piston diameter "A" : Refer to PISTON, PISTON RING AND PISTON PIN  .
    2. Measuring point "a" (Distance from the top) : 41.0 mm (1.61 in) 
    Fig 5: Measuring Point "A"
    G02110775Courtesy of NISSAN MOTOR CO., U.S.A.
  4. Check that piston-to-bore clearance is within specification.
    1. Piston-to-bore : 0.010-0.030 mm (0.0004-0.0012 in) clearance at "B" 
    • The piston-to-bore clearance is measured at the "B" level in the cylinder as shown. See Fig 3.
  5. Determine piston oversize according to amount of cylinder wear.

    Oversize pistons are available for service. 

    Refer to  PISTON, PISTON RING AND PISTON PIN   . 

  6. 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, 
      1. D : Bored diameter 
      2. A : Piston diameter as measured 
      3. B : Piston-to-bore clearance 
      4. C : Honing allowance 0.02 mm (0.0008 in) 
  7. Install main bearing caps, and tighten to the specified torque. Otherwise, cylinder bores may be distorted in final assembly.
  8. 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. 
  9. Hone cylinders to obtain specified piston-to-bore clearance.
  10. Measure finished cylinder bore for out-of-round and taper.
    • Measurement should be done after cylinder bore cools down. 
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