Nissan Micra K11 silhouetteK11

CYLINDER BLOCK — Inspection (Supplement-V)

EM-5037prose procedure

Distortion measurement pattern NEM296 uses 6 numbered positions (1-6) for the straight-edge sweep across the upper deck. Bore-gauge figure reused from CG variants but with VJZ-specific 77 mm nominal bore.

Continued from EM-5036

Inspection

Piston and piston pin clearance

  1. 1
    Measure inner diameter of piston pin hole "dp".
    Standard diameter "dp": 23.003 - 23.008 mm (0.9056 - 0.9058 in)
    Hand holding a dial-bore / small-hole gauge inside the piston pin hole of a piston standing on its crown — illustrates Piston and piston pin clearance step 1 (measure inner diameter 'dp').
    SEM149B
  2. 2
    Measure outer diameter of piston pin.
    Standard diameter: 22.996 - 23.000 mm (0.9054 - 0.9055 in)
    Hands using a micrometer to measure the outer diameter of the piston pin — illustrates Piston and piston pin clearance step 2.
    SEM821B
  3. 3
    Calculate piston pin clearance. Piston pin hole inner diameter - Piston pin outer diameter. If it exceeds the above value, replace piston assembly with pin.
    Clearance: 0.003 - 0.012 mm (0.0001 - 0.0005 in)

PISTON RING END GAP

Cylinder block distortion and wear

  1. 1
    Clean upper face of cylinder block.
  2. 2
    Measure the distortion of the upper face of cylinder block.
    Limit: 0.10 mm (0.0039 in)
    Top view of the cylinder block upper deck with a straight edge laid across it in 6 numbered positions (1-6) — measurement pattern for upper-face distortion: two diagonals (positions 1 and 2), longitudinal (3), transverse (4), and two short edges (5, 6).
    NEM296
  3. 3
    If out of specification, replace cylinder block.
    Nominal cylinder block height from oil pan gasket face: 265.23 mm (10.442 in)

Piston-to-bore clearance

  1. 1
    Using a bore gauge, measure cylinder bore.
    Standard inner diameter: 77.011 - 77.038 mm (3.0319 - 3.0330 in)
    Bore gauge being used to measure cylinder bore inner diameter on the cylinder block — illustrates Piston-to-bore clearance step 1.
    NEM318
  2. 2
    Check for scratches and seizure. If seizure is found, replace cylinder block.
  3. •
    If both cylinder block and piston are replaced with new ones, select piston height type. Refer to "DETERMINING THE PISTON TYPE", (EM-5041).
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See also

EM-5041 — DETERMINING THE PISTON TYPE

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