Nissan Micra K11 silhouetteK11

CYLINDER BLOCK — Inspection (Cont'd) / Bearing Clearance / Main Bearing

EM-50prose procedure
Continued from EM-49

Inspection (Cont'd)

Crankshaft runout

  1. 3
    Measure crankshaft runout. Runout (Total indicator reading): Less than 0.05 mm (0.0020 in).
    Crankshaft mounted between V-blocks with dial indicator on a center main journal measuring runout while crankshaft is rotated.
    SEM346D
Crankshaft runout (Total indicator reading)Limit
Less than 0.05 (0.0020)mm (in)

BEARING CLEARANCE

Main bearing

Main bearing clearance

  1. 1
    Set main bearings in their proper positions on cylinder block and main bearing cap.
    Set of main bearing shells laid out in order with callouts: Upper bearing, Thrust bearing (only upper), No. 5 bearing, Oil hole, Lower bearing, Identification color, Oil groove, No. 1 bearing, Front (arrow). Five sets total.
    SEM195C
  2. 2
    Install main bearing cap to cylinder block.
    Tighten all bolts in correct order in two or three stages.
    Cylinder block with main bearing cap (beam) installed; a bore gauge measuring the inner diameter of a main bearing in situ.
    UEM087
  3. 3
    Measure inner diameter of each main bearing.
  4. 4
    Measure outer diameter of each main journal in crankshaft.
    Crankshaft main journal being measured for outer diameter with a micrometer.
    SEM506A
  5. 5
    Calculate main bearing clearance. Main bearing clearance = Inner dia. − Outer dia. Standard: 0.022 - 0.038 mm (0.0009 - 0.0015 in). Limit: 0.064 mm (0.0025 in).
  6. 6
    If it exceeds the limit, replace bearing.
  7. 7
    If clearance cannot be adjusted within the standard of any bearing, grind crankshaft journal and use undersized bearing.
Main bearing clearance — StandardStandard
0.022 - 0.038 (0.0009 - 0.0015)mm (in)
Main bearing clearance — LimitLimit
0.064 (0.0025)mm (in)
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