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