DETROIT DIESEL 53
Camshaft and Bearings 1.7.2
the camshaft bore and is used when removing the other end bearing and any remaining bearings.
Install Intermediate and/or Center Camshaft Bearings
Camshaft, center and intermediate bearings must be installed prior to installing the camshaft end bearings. On
the four cylinder In-Line and 8V engine, the center, rear intermediate and rear bearings are installed in that
order by pressing the bearings from the rear to the front of the block. The front intermediate and front
bearings are installed .by pressing the bearings from the front to the rear of the block. Bearings are similarly
installed in the three cylinder and 6V engine except that there is no center bearing. The center bearing for the
two cylinder block is installed by pressing the bearing from the rear to the front of the block.
NOTE: Current bearings incorporate lubrication grooves on the inner
bearing surface (Fig. 5). To properly install the camshaft and balance
shaft bearings, refer to Fig. 6 for location of the notch in the bearing in
relation to the camshaft or balance shaft bore centerline in the cylinder
block.
Also, to facilitate assembly, the camshaft and balance shaft bearings are color coded on the side and/or end as
shown in Table 2.
1. Insert pilot J 7593-2 in the bore of the block as shown in Fig. 4. Use the small end of the pilot if an end
bearing has been installed. Refer to B and C of
Fig. 7.
CAMSHAFT AND BALANCE SHAFT BEARING COLOR CODE CHART
Bearing
Color Code
Outside
Inside
Position
Diameter
Diameter
Current
Former
End
Brown
Black
Standard
Standard
.010"&.020" U.S.
Brown
Yellow
.010"
Oversize
Standard (only)
Inter-
Orange
Red
Standard
Standard
mediate
Orange
Blue
.010"
.010" & .020" U.S.
Oversize
Standard (only)
Table 2
2. Insert the new intermediate or center bearing into the camshaft bore and position it correctly. Install the
center bearing first.
3. Then, with the unthreaded end of shaft J 7593-1 started through the pilot, push the shaft through the entire
length of the block bore.
4. Slide installer J 7593-6 on the shaft until the locating pin registers with the notch in the bearing Then, slide
installer J 7593-3 or J 7593-15 on the shaft with the large diameter inserted into the end of the block bore.
Refer to C and note of Fig. 7.
5. Next, place a spacer (if required), thrust washer, plain washer and hex nut over the threaded end of the
puller. The short spacer J 7593-11, shown in Fig. 4, is used on the three cylinder (In-Line) and 6V blocks. The
long spacer J 7593-10 is used on the two cylinder block.
6. Align the shaft in such a way that a "C" washer, J 7593-4, can be inserted in a groove in the shaft adjacent
to installer J 7593-6.
7. Place a "C" washer in the groove near the end of the shaft and, using a suitable wrench on the hex nut,
draw the bearing into place until the "C" washer butts up against installer J 7593-3 and prevents the shaft from
further movement.
Install End Bearings
Refer to the camshaft and balance shaft 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.
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.
August, 1972 SEC. 1.7.2 Page 5
