2.2 Fuel Pump
DETROIT DIESEL 53
Fig. 5. - Fuel Pump Details and Relative Location of Parts (Right Hand Pump Shown)
with the hollow end up. Insert the spring inside of the
production gear must face the pump body.
valve and the pin inside of the spring. With a new
If a service replacement gear with a slot is
gasket in place next to the head of the valve plug, place
used, the slot must face toward the pump
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.
5. Place the driven shaft and gear assembly in the
Fig. 6 Installing Inner Oil Seal
CAUTION: The driven gear must be
centered on the shaft to give proper end
clearance. Also, the chamfered end of the
1970 General Motors Corp.