CAMSHAFT 1298586 - Caterpillar

Illustration 294 g01298672
The enlarged section of radius at location (14) Refer to Illustration 293.
(C) 23.25 mm (0.915 inch) maximum (D) 0.5 mm (0.02 inch) (E) 1.9 0.3 mm (0.07 0.01 inch) radius (14) Remove the area of the crosshatch by using a 4C-8624 mandrel.Rework Procedure
Put 4C-3845 Grinding Wheel in the chuck of the air drill or in the chuck of the electric drill.
Operate the drill at full rated speed and lightly insert the mounted point into the bolt hole.
Apply a steady pressure that is equal to two times the weight of the drill for one and one half to two seconds. This should create a 0.5 mm (0.02 inch) chamfer on the edge of the bolt hole.
Ensure that the chamfered diameter is not larger than 23.25 mm (0.915 inch) (C).
Repeat this procedure for each bolt hole.Note: The bolt hole at the middle position may already have a chamfered diameter on some cylinder heads. This diameter may be larger than 23.25 mm (0.915 inch) (C). Do not add an extra chamfer to this hole. Polish the hole with the reconditioning tool that is described in the following procedure:
After all the holes have been reworked to have smooth corners put 4C-8629 Mandrel and 4C-8624 Mandrel in the drill.
Operate the drill in a clockwise direction at full rated speed. Insert the drill halfway into the bolt hole. Apply light pressure to the chamfered edge of the hole. Steadily increase the pressure to flex the arms of the drill into the hole.
Insert the drill and remove the drill from each hole several times. Continue to perform this procedure until the edges of the chamfers are removed, and a smooth radius and a polished radius is formed.
Clean the cylinder head thoroughly before putting the cylinder head back into service.Inspection and Repair Procedure for the Saddle of the Rocker Arm Shaft in C15, C16, C18, 3406E, C27, C32, and 3456 Engines
Inspection Procedure
Fix the indicator and the surface probe to the 90° holding block. Find the area that is unworn between the saddle of the rocker shaft and the rocker arm shaft. Remove the burrs by lightly filing the edges at the top of the saddle on the rocker shaft. Set the indicator on the milled face of the head over the saddle of the rocker shaft. Locate the lowest point of the saddle by moving the block back and forth. Ensure that the block is perpendicular to the axis of the camshaft. Zero the indicator. Move the indicator back and forth to recheck the zero. If necessary, reset the indicator to zero.
When the indicator is reset move the indicator to the worn portion of the saddle of the rocker shaft at the end of the rocker arm shaft. Again, move the block back and forth to make sure that the block is perpendicular to the axis of the camshaft. Record the lowest negative number as the maximum amount of wear. The lowest number will be the lowest point.
Repeat the