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Home >> Nissan-Datsun >> 2009 >> Sentra SE-R >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Engine Mechanical (Qr25DE) >> Service Information >> Cylinder Block >> How to Select Piston and Bearing >> How To Select A Main Bearing >> When New Cylinder Block and Crankshaft are Used:

When New Cylinder Block and Crankshaft are Used:

  1. "Main Bearing Selection Table" rows correspond to bearing housing grade on rear left side of cylinder block.
    • If there is a corrected stamp mark on the cylinder block, use it as a correct reference.
      Fig 1: Checking Cylinder Bore Grade On Rear Left Side Of Cylinder Block
      G04885885Courtesy of NISSAN MOTOR CO., U.S.A.
  2. Apply pin diameter grade (B) stamped on crankshaft front side to column in "Main Bearing Selection Table".
    • A: Journal diameter grade
      Fig 2: Identifying Pin Diameter And Journal Diameter Grade
      G04924918Courtesy of NISSAN MOTOR CO., U.S.A.
  3. Find value at crossing of row and column in "Main Bearing Selection Table".
    CAUTION:
    • There are two main bearing selection tables. One is for odd-numbered journals (1, 3, and 5) and the other is for even-numbered journals (2 and 4). Make certain to use the appropriate table. This is due to differences in the specified clearances.
  4. Apply the symbol obtained to "Main Bearing Grade Table" to select.
    NOTE:
    • Service parts are available as a set of both upper and lower.
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