Crankshaft Inspection

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Install the main bearing cap. (See MAIN BEARING CAP ASSEMBLY NOTE .)
Measure the crankshaft end play.
- If it exceeds the specification, replace the thrust bearing or crankshaft so that the specified end play is obtained.
Standard End Play
1. 0.22-0.45 mm {0.0087-0.0177 in}
Maximum End Play
1. 0.55 mm {0.0216 in}
  
  Fig 1: Measuring Crankshaft End Play
  Courtesy of MAZDA MOTORS CORP.
Remove the main bearing cap. (See MAIN BEARING CAP DISASSEMBLY NOTE .)
Measure the crankshaft runout.
- If it exceeds the specification, replace the crankshaft.
Maximum Runout
1. 0.05 mm {0.0019 in}
  
  Fig 2: Measuring Crankshaft Runout
  Courtesy of MAZDA MOTORS CORP.

Measure the journal diameter in X and Y directions at the two points (A and B) as indicated in the figure.

If it exceeds the specification, replace the crankshaft or grind the journal and install the undersize bearing.

Fig 3: Measuring Crankshaft Journal Diameter

Courtesy of MAZDA MOTORS CORP.

MAIN JOURNAL BEARING SPECIFICATION

Bearing Size (mm {in})	Standard Diameter (mm {in})
Standard	51.980-52.000 {2.0464-2.0472}
0.25 {0.01}	51.730-51.750 {2.0366-2.0373}

Maximum Out-Of-Round

0.05 mm {0.0019 in}

CRANK PIN

Type	Bearing Size (mm {in})	Standard Diameter (mm {in})
LF	Standard	46.980-47.000 {1.8497-1.8503}
LF	0.25 {0.01} Undersize	46.730-46.750 {1.8398-1.8405}
L3	Standard	49.980-50.000 {1.9677-1.9685}
L3	0.25 {0.01} Undersize	49.730-49.750 {1.9579-1.9586}

Maximum Out-Of-Round

0.05 mm {0.0019 in}

Install the main bearing caps and crankshaft.
Position a plastigage atop the journals in the axial direction.
Install the main bearing caps and cylinder block. (See MAIN BEARING CAP ASSEMBLY NOTE .)
Remove the main bearing caps. (See MAIN BEARING CAP DISASSEMBLY NOTE .)

Measure the main journal oil clearance.

If it exceeds the specification, replace the main bearing using the main bearing selection table or grind the main journal and install the oversize bearings so that the specified oil clearance is obtained.

Standard Clearance

0.019-0.035 mm {0.0007-0.0013 in}

Maximum Clearance

0.10 mm {0.0039 in}

Fig 4: Measuring Main Journal Oil Clearance (Plastigage)
Courtesy of MAZDA MOTORS CORP.

MAIN BEARING SPECIFICATIONS

Bearing Size (mm {in})	Bearing Thickness (mm {in})
Standard	2.506-2.509 {0.0987-0.0988}
0.25 {0.01} Oversize	2.628-2.634 {0.1034-0.1037}
0.50 {0.02} Oversize	2.753-2.759 {0.1084-0.1086}