2.2.1 Fuel Pump Drive
DETROIT DIESEL 53
2. Assemble the fuel pump drive gear and thrust
Inspection
washers on the hub. The oil grooves in the thrust
washers must face toward the gear. Note the position of
Wash the drive gear and its related parts with fuel oil
the oil hole in the hub.
and dry them with compressed air. Inspect the thrust
washers, hub and drive gear bearing for wear and
3. Install the hub and gear assembly on the engine with
scoring. Parts which are excessively worn or scored
the small diameter of the hub entering the rear end plate
must be replaced. A pre-finished drive gear bearing
and the counterbore in the cylinder block.
(bushing type) is available for service. A new bushing
should be pressed in flush to .010" below the gear face
and the fuel pump drive gear teeth in mesh with the
(both sides). Examine the gear teeth and, if they are
camshaft gear teeth. The oil hole in the hub should be
excessively worn, scored or pitted, replace the gear and
toward bottom-of the engine.
bushing assembly.
4. Secure the gear and hub assembly in place with the
Install Fuel Pump Drive Gear (V-Type Engine)
gear retaining bolt and washer. Tighten the 1/2"-13 bolt
to 71-75 lb-ft torque.
The fuel pump drive gear and its related parts may be
installed on the engine as outlined below:
5. Check the clearance between the gear and the thrust
washer. The specified clearance between new parts Is
1. Lubricate the drive gear bearing, thrust washers and
between .011' and .018". The maximum clearance
hub with engine oil.
between used parts must not exceed .022" .
6. Attach the fuel pump drive adaptor to the gear with
the two bolts.
1970 General Motors Corp.
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