DETROIT DIESEL 53
Camshaft and Bearings 1.7.2
the camshaft bore and position it correctly.
Install Intermediate Camshaft Bearings
3. Then, with the unthreaded end of shaft J 7593-1
Camshaft intermediate bearings must be installed prior
started through the pilot, push the shaft through the
to installing the camshaft end bearings.
entire length of the block bore.
The
front
4. Slide installer J 7593-6 on the shaft until the locating
intermediate and front bearings are installed by pressing
pin registers with the notch in the bearing.
the bearings from the front to the rear of the block.
Then, slide installer J 7593-3 or J 7593-15 on the shaft
with the large diameter inserted into the end of the block
NOTE:
Bearings
incorporate
bore. Refer to C and note of Fig. 7.
lubrication grooves on the inner
bearing surface (Fig. 5).
5. Next, place a spacer (if required), thrust washer,
plain washer and hex nut over the threaded end of the
To properly install the camshaft bearings, refer to Fig.
puller. The short spacer J 7593-11, shown in Fig. 4., is
6. for location of the notch in the bearing in relation to
used on the 6V blocks.
the camshaft core centerline in the cylinder block.
6. Align the shaft in such a way that a "C" washer, J
Also, to facilitate assembly, the camshaft bearings are
7593-4, can be inserted in a groove in the shaft adjacent
color coded on the side and/or end as shown in Table 2.
to installer J 7593-6.
1. Insert pilot J 7593-2 in the bore of the block as
7. Place a "C" washer in the groove near the end of
shown in Fig. 4. Use the small end of the pilot if an end
the shaft and, using a suitable wrench on the hex nut,
bearing has been installed. Refer to B and C of Fig. 7.
draw the bearing into place until the "C" washer butts up
against installer J 7593-3 and prevents the shaft from
2. Insert the new intermediate bearing into
further movement.
Install End Bearings
Refer to the camshaft color code chart and the cylinder
block bore machining dimension chart when installing
the end bearings.
1. Insert pilot J 7593-2 in the bore of the block as
shown in "D" of Fig. 7. Use the small diameter of the
pilot if a bearing has been installed.
2. Insert support J 7593-12 in the bore in the opposite
end of the block; then, with the unthreaded end of the
shaft started through pilot J 7593-2, push the shaft
through the block and support J 7593-12.
Table 2
3. Place a new end bearing on installer J 7593-3 and
align the notch in the bearings with the pin on the
installer. Then, slide the installer and the bearing on the
shaft. Position the bearing correctly with the groove in
the camshaft bore.
4. Place "C" washer J 7593-4 in the end notch in the
shaft; pull the shaft back until the washer butts against
the installer.
5. Next, place a spacer (if required), thrust washer,
plain washer and hex nut over the threaded end of the
shaft as shown in "D" of Fig. 7. and, using a suitable
wrench on the hex nut, draw the bearing into place
1972 General Motors Corp.
February, 1972
SEC. 1.7.2 Page 5
