Inspection and Reconditioning (Rev 1/97)
51
Measuring Cam Lobes
4. Measure the camshaft deflection by placing the front
and rear camshaft journals in a set of “V” blocks. Set a
dial indicator on a middle camshaft journal and rotate
the camshaft one full turn. The camshaft deflection
equals one half of the largest difference in readings on
the dial indicator. If the camshaft deflection is greater
than the wear limit (refer to Specifications), the cam-
shaft must be replaced.
Measuring Camshaft Deflection
5. Check the thrust plate clearance (end play) by placing a
feeler gauge between the thrust plate and the camshaft
gear. If the clearance exceeds the wear limit (refer to
Specifications), replace the thrust plate and check the
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clearance again. If the clearance still exceeds the wear
limit after replacing the thrust plate, replace the cam-
shaft gear also. To remove the camshaft gear use a stan-
dard gear puller or a hydraulic press. Install the
camshaft gear with a hydraulic press.
Checking Thrust Plate Clearance
Cylinder Head
1. Clean all the carbon and any other deposits from the
cylinder head with a gasket scraper or a wire brush.
Visually inspect the cylinder head for cracks and the
sealing surfaces for damage.
Checking Cylinder Head Distortion
2. Use a straight edge and a feeler gauge to check the cyl-
inder head deck for distortion. Check all four sides,
both diagonals, and the center lines of the cylinder head
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