REPAIR INSTRUCTIONS
Page 145
Camshaft Bushing Replacement
[213 CC]
Typically, camshaft bushings have an extremely
long service life and need not be replaced unless
they are obviously damaged or worn beyond
normal wear limits. However, It is good policy to
replace the camshaft bushings when overhauling
the engine out of chassis, even if the bushings
are within acceptable wear tolerances.
REMOVAL
Camshaft bushings are identified in sequence, 1
to 7, starting from the front of the engine.
1. Using camshaft bushing remover/installer
J 42377 (with J 21428-01 Cam Bushing
Installer Set) and a hammer, remove the
No. 1 camshaft bushing from the cylinder
block. Refer to Figure 136.
136
Figure 136 — Camshaft Bushing Removal
2. Remove the remaining six bushings in
sequence.
3. Check the bushing bore diameters and finish
in the block, using a telescoping gauge or
inside micrometer.
CAMSHAFT BUSHING ALIGNMENT
Each camshaft bushing is located at set
distances from the thrust washer mounting
surface to the forward edge of the bushing. Refer
to Figure 137.
When installed to the proper dimensions, the
intermediate bushings (locations 2, 3, 5 and 6)
are approximately centered in their bores, in the
front-to-rear direction. The front, center and rear
bushings, however, are not centered. The offsets
are described as follows:
r
No. 1 bushing — Installed with the front of
the bushing flush, to 0.030 inch behind the
front face of the bore. There is
approximately 1/8-inch of the bore visible on
the rear side of the bushing.
r
No. 4 bushing — When installed correctly,
there is approximately 0.400 inch (10 mm) of
bore visible at the front face of the bushing,
and approximately 0.040 inch (1 mm) of
bushing protrusion from the rear of the bore.
r
No. 7 bushing — When installed correctly,
there is an approximate 1/8-inch wide
section of bore visible at the front face of the
bushing.
Installing the cam bushings to the correct
dimensions optimizes bushing-to-cylinder block
oil hole alignment. Even when installed to the
proper dimensions, however, the No. 1 and No. 4
bushings have only approximately 1/2-to-2/3 of
the oil hole in alignment with the oil hole in the
bore, as 100 percent oil hole alignment is not
attainable or required.
Beginning approximately mid-December 1999, a
groove, 360 degrees around the inside diameter,
has been added to the camshaft bushings (part
No. 57GB37). The grooved bushings can be used
with either the grooved or non-grooved camshaft
journals, and the camshaft with grooved journals
can be used with either grooved or non-grooved
bushings. Parts can be intermixed in an engine.
5_106_00.bk Page 145 Friday, August 4, 2000 11:17 AM
BDC for engine manuals and specs
