Crankshaft Oil Clearance Inspection/Repair

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CAUTION:

Because the bolts are pliant bolts, they cannot reused. Use new bolts for inspection. The bolts may be reused for assembly.

Install the upper main bearing and crankshaft.
Position a plastigage atop the journals in the axial direction.
Install the lower main bearing and lower cylinder block, and tighten the bolts in the order indicated in the figure.
Tightening Torque
1. 37-43 N.m {3.7-4.4kgf.m, 27-31 ft.lbf}
Fig 1: Lower Main Bearing & Lower Cylinder Block Bolt Tightening Sequence
Courtesy of MAZDA MOTORS CORP.
Tighten the bolts by turning each 85° - 95° in the sequence as indicated in the figure.
Loosen the bolts in the reverse order of tightening.
Measure the main journal oil clearance.
- If the clearance exceeds the maximum, replace the main bearing using the main bearing selection table or grind the main journal and install the undersize bearings so that the specified oil clearance is obtained.
  
  Fig 2: Measuring Main Journal Oil Clearance
  Courtesy of MAZDA MOTORS CORP.
Standard Clearance
1. 0.025-0.045 mm {0.0010-0.0017 in}
Maximum Clearance
1. 0.050 mm {0.0019 in}

Main Bearing Selection Table

Fig 4: Main Bearing Selection Table

Courtesy of MAZDA MOTORS CORP.

Example Of Main Bearing Selection

Fig 5: Main Bearing Selection Example

Courtesy of MAZDA MOTORS CORP.