Mount crankshaft radially in bearings

AR03.20-D-4355-01R

Mount crankshaft radially in bearings

ENGINE

646 in MODEL 909

Test specifications for crankshaft bearing clearance

Number

Designation

ENGINE 646 in MODEL 909

BE03.20-N-1001-04B

Crankshaft bearing clearance (when new)

Radial measurement when new

mm

0,027...0,051

radial wear limit

mm

0,08

Axial measurement when new

mm

0,100...0,254

axial wear limit

mm

0,3

1

Mount crankshaft bearing cap.

 The crankshaft bearing caps are fitted laterally in cylinder crankcase. The fit is off-centered 0.5 mm with the result that crankshaft bearing caps can only be mounted in one position. In the correct installation position, the lug (arrow) on the crankshaft bearing cap points to the left (intake side) when viewed in the direction of travel. Crankshaft bearing caps are machined together with the cylinder crankcase and must not be interchanged.

2

Measure crankshaft bearing bore with the  dial indicator and a quicktest gauges for internal measurements in direction "A" and note the measured value (for example: 62.51 mm dia.).

 If damage is visible at the bearing points of the cylinder crankcase, the cylinder crankcase must be replaced.

3

Detach crankshaft bearing cap.

4

Measure crankshaft bearing journal dia. with a outside micrometer (for example: 57.95 mm dia).

 Example:
Crankshaft bearing journal dia. 62.51 mm
Crankshaft bearing journal dia. –57.95 mm
4.56 mm
Radial bearing play (specified value)
Check values  Table "Crankshaft bearing clearance" –0.04 mm
4.52 mm : 2
Required bearing shell thickness 2.26 mm

 In the event of different bearing shell thicknesses, install thicker crankshaft bearing shells in the crankshaft bearing cap.