DETROIT DIESEL 53
2.2 Fuel Pump
Fig. 5 - Fuel Pump Details and Relative Location of Parts (Right Hand Pump Shown)
production gear must face the pump body. If a
with the hollow end up. Insert the spring inside of the
service replacement gear with a slot is used, the
valve and the pin inside of the spring. With a new
slot must face toward the pump cover.
gasket in place next to the head of the valve plug,
place the plug over the spring and thread it into the
pump body. Tighten the plug.
3. Install the pump drive gear over the end of the
drive shaft which is not squared (so the slot in the gear
will face the plain end of the shaft). This operation is
very important, otherwise fine score marks caused by
pressing the gear into position from the square end of
the shaft may cause rapid wear of the oil seals. Press
the gear beyond the gear retaining ball detent. Then,
place the ball in the detent and press the gear back
until the end of the slot contacts the ball.
4. Lubricate the pump shaft and insert the square end
of the shaft into the opening at the gear side of the
pump body and through the oil seals as shown in
Fig. 8.
5. Place the driven shaft and gear assembly in the
pump body.
CAUTION: The driven gear must be centered on
the shaft to give proper end clearance. Also, the
chamfered end of the gear teeth of the
Fig. 6 - Installing Inner Oil Seal
Page 4
