Crankshaft Main Bearing: Specifications

Crankshaft Main Bearings

Oil Clearances
Standard 0.016 to 0.039 mm (0.000630 to 0.00154 in.)
Maximum 0.050 mm (0.00197 in.)

If replacing a bearing, select a new one with the same number. If the number of the bearing cannot be determined, calculate the correct bearing number by adding together the numbers imprinted on the cylinder block and crankshaft. Then select a new bearing with the calculated number according to the chart below. There are 4 sizes of standard bearings, marked "1", "2", "3" and "4" accordingly.

Example: Cylinder block "3" + Crankshaft "5" = Total number 8 (Use bearing "3")

Bearing Chart





Standard Cylinder Block Journal Bore Diameter





Standard Crankshaft Journal Diameter





Standard Bearing Center Wall Thickness





Crankshaft Main Bearing Bolts

Inspection
Measure bolt length from the seat to end









Standard bolt length 84.3 to 85.7 mm (3.32 to 3.37 in.)
Maximum bolt length 86.7 mm (3.41 in.)

If bolt length is greater than maximum, replace bolt with a new one
If there is any thread deformation, replace bolt with a new one

Measure diameter of the threaded portion of the bolt at its thinnest point
Use a straightedge to determine thinnest point of the threaded portion of the bolt

Measurement point 55.0 mm (2.17 in.)
Standard diameter 9.77 to 9.96 mm (0.385 to 0.392 in.)
Minimum diameter 9.1 mm (0.358 in.)

If diameter is less than minimum, replace bolt with a new one
If there is any thread deformation, replace bolt with a new one

Tightening Sequence





Step 1 Torque 40 Nm (408 kgf-cm, 30 ft-lbf)
Step 2 Tighten 90° in sequence shown in Step 1