DETROIT DIESEL 53
Fuel Pump 2.2
1. Remove the eight cover bolts and withdraw the
pump cover from the pump body. Use care not to
damage the finished faces of the pump body and cover.
2. Withdraw the drive shaft, drive gear and gear
retaining ball as an assembly from the pump body.
3. Press the drive shaft just far enough to remove the
steel locking ball. Then, invert the shaft and gear
assembly and press the shaft from the gear. Do not
misplace the steel ball. Do not press the squared end of
the shaft through the gear as slight score marks will
damage the oil seal contact surface.
4. Remove the driven shaft and gear as an assembly
Fig. 4 Removing Oil Seals
from the pump body. Do not remove the gear from the
shaft. The driven gear and shaft are serviced only as an
valve is scored and cannot be cleaned up with fine
emery cloth or crocus cloth, it must be replaced.
Remove the relief valve plug.
Assemble Fuel Pump
Remove the valve spring. pin and relief valve from
1. Lubricate the lips of the oil seals with a light coat of
the valve cavity in the pump body.
vegetable shortening, then install the oil seals in the
pump body as follows:
7. If the oil seals need replacing, remove them with
tool J 1508-7, as shown in Fig. 4., by clamping the
Place the inner oil seal on the pilot of the
pump body in a bench vise and screwing the threaded
installer handle J 1508-8 so that the lip of
end of the tool shaft into the outer oil seal (seal nearest
the seal will face toward the shoulder on
to the bolting flange). Then tap the pilot end of the shaft
with a hammer to remove the seal. Repeat this
operation to remove the inner oil seal.
With the pump body supported on wood
blocks, insert the oil seal and tool in the
pump body and drive the seal in until it
bottoms in the counterbore (Fig. 6.).
Clean all of the parts in clean fuel oil and dry them with
Place the shorter end of the adaptor J
1508-9 over the pilot and against the
Oil seals, once removed from the pump body, must be
shoulder of the installer handle. Place the
discarded and replaced with new seals. The lips of the
outer oil seal on the pilot of the installer
oil seals must fit snug around the pump shaft and must
handle with the lip of the seal facing the
be free of nicks or cracks.
adapter. Then, insert the pilot of the
installer handle into the pump body and
Check the pump gear teeth for scoring, chipping or
drive the seal in (Fig. 7.) until the shoulder
wear. Check the ball slot in the drive gear for wear. If
of the adaptor contacts the pump body.
necessary, replace with a new gear.
Thus the oil seals will be positioned so that
the space between them will correspond
Inspect the drive and driven shafts for scoring or wear.
with the drain holes located in the bottom
of the pump body.
Replace with new shafts if necessary. The driven shaft
is serviced as a gear and shaft assembly only. The
2. Clamp the pump body in a bench vise (equipped with
mating faces of the pump body and cover must be flat
soft jaws) with the valve cavity up. Lubricate the outside
and smooth and fit tightly together. Any scratches or
diameter of the valve and place it in the cavity
slight damage may result in pressure leaks. Also check
for wear at areas contacted by gears and shafts.
Replace the cover or body if necessary.
The relief valve must be free from score marks and
burrs and fit its seat in the/pump body. If the relief
1970 General Motors Corp
SEC. 2.2 Page 3