Crankshaft Service

OVERVIEW
Crankshaft main and rod journals may be ground in increments of 0.25 mm (0.0098 inch) up to a total of 1.00 mm (0.0394 inch).
The only exception is the main journal thrust width surface. This journal must be ground in increments of 0.50 mm (0.0197 inch) up to a total of 1.00 mm (0.0394 inch). The thrust surface is located on the No.6 main bearing. When the thrust surface requires grinding, the main journal must be ground to the same undersize dimension.

CAUTION: Welding of the crankshaft is not allowed. Failure of the crankshaft will result.

MAIN JOURNAL
All main journals are to be ground in the opposite direction of engine rotation (clockwise as viewed from the front of crankshaft). Polish the journals in the same direction as engine rotation.





Fig. 33





Crankshaft Main Journal Dimensions Chart

The main bearing grinding specifications are shown in (Fig. 33).





Fig. 34





Thrust Journal Width Dimensions Chart

Thrust journals can be ground in the same increments and using the same specifications as all other main journals. The main journal radius may be ground using either the preferred or the alternative procedure providing the thrust surface width is not being ground. The preferred procedure must be used when the main bearing thrust width surface is ground. When the thrust surface width requires grinding, the main journal must be ground to the same undersize dimension (Fig. 34).





Fig. 35

The thrust surface is to be ground on center within 0.10 mm (0.004 inch). It also must be perpendicular to the front and rear mains within 0.0015 mm (0.00006 inch) per radial inch on the thrust area (Fig. 35). The surface finish requirement is 0.04 micrometer (16.0 microinch).

PREFERRED PROCEDURE:

Part 1 Of 2:

Fig. 36

Part 2 Of 2:

Crankshaft Main Journal Surface Finish Chart (Preferred Method)

Smoothly blend a 4.20 +/- 0.020 mm (0.1654 +/- 0.0008 inch) radius to the ground diameters (Fig. 36).

CAUTION: DO NOT use the Alternative Procedure when the thrust surface width is ground.

ALTERNATIVE PROCEDURE:

Part 2 Of 2:

Fig. 37





Crankshaft Main Journal Surface Finish Chart (Alternative Method)

Smoothly blend a 1.25 +/- 0.020 mm (0.0492 +/- 0.0008 inch) radius to the ground diameters (Fig. 37).


ROD JOURNAL





All rod journals are to be ground in the opposite direction of engine rotation (clockwise as viewed from the front of crankshaft). Polish the journals in the same direction as engine rotation.
The rod bearing grinding specifications are shown in the Crankshaft Rod Journal Dimension Chart.

PREFERRED PROCEDURE:





Fig. 38





Crankshaft Rod Journal Surface Finish Chart (Preferred Method)

Smoothly blend a 4.00 +/- 0.020 (0.1575 +/- 0.0008 inch) radius to the ground diameters and side faces (Fig. 38).

ALTERNATIVE PROCEDURE:





Fig. 39





Crankshaft Rod Journal Surface Finish Chart (Alternative Method)

Smoothly blend a 1.25 +/- 0.020 mm (0.0492 +/- 0.0008 inch) radius to the ground journals (Fig. 39).