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 (3) Inspect both faces of the thrust washers. Those that are excessively scored or worn must be replaced. The
clearance between the thrust washer and the thrust shoulder of the shafts is .004 inch to .012 inch with new parts, or a
maximum of .018 inch with used parts.
(4) Examine the faces of the shaft end bearings and any other surface which comes into contact with the thrust
washers. Parts that are badly marred must be replaced, slight scratches may be cleaned up with an oil stone.
(5) Inspect the bushings in the shaft end bearings. Replace the bushings or end bearing assemblies if they are
worn excessively or the bushings have turned within the bearing. New bushings must be finished bored to a 20 rms finish
after installation and tested for the correct press fit. The correct press fit is indicated if the bushing does not turn when a
2000 pound end load is applied. The inside diameter of the bushings must be square with the rear face of the bearing
within .0015 inch total indicator reading, and concentric with the outside diameter of the bearing retainer within .002 inch
total indicator reading. The bushings must project from .045 inch to .055 inch from each end of the bearing.
(6) The clearance between the camshaft and balance shaft end journals and the end bearing bushings is .0025
inch to .004 inch with new parts, or a maximum of .006 inch with used parts.
(7) Replace excessively scored or worn camshaft intermediate bearings. The clearance between the camshaft
journals and the intermediate bearings is .0025 inch to .005 inch with new parts, or a maximum of .009 inch with worn
parts. Examine the intermediate bearing lock screws and the tapped holes in the block. Damaged holes in the cylinder
block may be plugged, redrilled and tapped. Discard lock screw with damaged threads.
g. Reassembly.
(1) Install new end plugs (2, fig. 3-100) in the camshaft.
(2) Apply grease to the steel face of end thrust washers. Then, place a thrust washer (39 and 31) against each end
of the cam and balance shaft rear bearings. The steel faces of the thrust washers must be towards the bearing.
(3) Lubricate the rear cam and balance shaft journals and slide the rear bearings on each shaft with the mounting
flange of the bearing toward the gear end of the shaft.
(4) Install the gears on the shaft.
(5) Lubricate the camshaft intermediate bearing journals (8). Then, place the two halves of each intermediate
bearing (5) on a camshaft journal and lock the halves together with the two lock rings (7). Install each lock ring with the
gap over the upper bearing and the ends on equal distance above the split line of the bearing.
h. Installation (Flywheel Housing and Transmission Removal).
(1) Insert the front end of the camshaft into the opening on the opposite side of the blower. Push the camshaft into
the cylinder block until the camshaft gear teeth almost engage the teeth of the idler gear. Use care when installing the
camshaft to avoid damaging the cam lobes.
NOTE
The right hand gear (viewing the engine from the flywheel end) whether it is attached to the
cam or balance shaft has left-hand helical teeth.
(2) Aline the timing marks on the mating gears as shown in figures 3-67 and 3-68 and slide the camshaft gear in
place.
(3) Secure the camshaft rear bearing (11, fig. 3-100) to the cylinder block with three bolts and lock washers. The
camshaft gear may be turned to accommodate the bolts through the hole in the gear web. Tighten the bolts to 35-40 ft-lb
torque.
(4) Insert the balance shaft into the bore in the cylinder block and push it in until the teeth of the balance shaft gear
almost engage the camshaft gear teeth.
(5) Aline the timing marks on the mating gears as shown in figures 3-67 and 3-68, and slide the balance shaft gear
into place.
(6) Secure the balance shaft rear bearing. Use the same procedure as outlined for the camshaft rear bearing, step
3.
(7) Apply grease to the steel face of each thrust washer (39 and 31, fig. 3-100). Then, place a thrust washer
against the inner end of the cam and balance shaft front end bearing (B engines). The steel face of the thrust washer must
be against the bearing.
(8) Install the cam and balance shaft front end bearings with the bolts and lock washers. Tighten the bolts to 35-
40 ft-lb torque.
CAUTION
Install the front bearings with care to avoid dislodging the thrust washers. Do not
hammer the bearings into the cylinder block.
(9) Apply grease to the steel face of each thrust washer (39 and 31) and place them so that the steel faces are
against the outer end of the cam and balance shaft front bearings (1 and 32).
(10) Turn the camshaft intermediate bearings until the holes in the bearings are in alinement with the threaded holes
in the cylinder block. Install the lock screws and tighten them to 15-20 ft-lb torque.
(11) Install the front balance weights on the shafts.
3-145
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