Fig. 10. Typical Camshaft and Balance Shaft Details and Relative Location of Parts
Examine the faces of the shaft end bearings and any
face of the bearing within .0015" total indicator reading
other surface which comes into contact with the thrust
and concentric with the outside diameter of the bearing
washers. Parts that are badly marred must be replaced;
retainer within .002" total indicator reading.
parts with slight scratches may be cleaned up with an oil
bushings must project from .045 " to .055 " from each
The clearance between the camshaft and balance shaft
end journals and the end bearing bushings is .0025 " to
If a new camshaft is to be installed,
.004 " with new parts or a maximum of' .006 " with used
steam clean it to remove the rust
parts. End bearings are available in .010 " or .020 "
preventive and blow out the oil
undersize for use with shafts that are worn or have been
passages with compressed air.
reground and the clearances exceed the specified limits.
Inspect the bushings in the shaft end bearings. Replace
Replace excessively scored or worn camshaft
the bushings or end bearing assemblies if they are worn
intermediate bearings. The clearance between the
excessively or the bushings have turned within the
camshaft journals and the intermediate bearings is
bearing. New bushings must be finished bored to a 20
.0025 " to .005 " with new parts or a maximum of .009"
rms finish after installation and tested for the correct
with worn parts. Camshaft intermediate bearings are
press fit. The correct press fit is indicated if the bushing
available in .010 " and .020 " undersize for use with
does not move when a 2000 pound (8.9 kN) end load is
worn or reground shafts in which the clearances exceed
applied. This test is of special importance with engines
the specified limits. Examine the intermediate bearing
that operate at high (2300 rpm) speeds. The inside
lock screws and the tapped holes in the block.
diameter of the bushings must be square with the rear
Damaged holes in the cylinder block may be plugged,