TRUCK SERVICE MANUAL
Gear Pump
1. Assemble the gear pump to the main housing using a
new gasket. Locate notch for right hand or left hand
rotation. For right hand rotation locate notch to upper
right hand corner (looking from behind the fuel pump);
for left hand rotation locate the notch to bottom left hand
corner.
6 175836 ELBOW-CHECK VALVE
Fig. 5-110, F5159. Fuel flow check valves
Assembly
1. Install orifice assembly, consisting of elbow and
orifice plug in 1/8 inch [3.17 mm] hole in bottom or back
side of fuel pump housing. See Table 5-14 for correct
orifice assembly.
Table 5-14: Cooling Kits
Pump Size
Kit Part
Check
Orifice
Fig. 5-109, F562. Torquing gear pump capscrews
Inch [mml
Number
Valve
Assembly
Note: Use correct gasket and be sure it is positioned
correctly. Be certain housing fuel holes match gear
3/4 [19.0]
BM-96293 177279
BM-93301
pump holes.
2. Torque capscrews in increments to 11 to 13 foot
2. Attach check valve, Part No. 177279, to elbow. End
pounds [15 to 18 N. m]. Fig. 5-109. Check gear pump
of valve containing ball must be toward orifice assembly.
rotation freedom.
Note: Check valve will prevent fuel pump from being
3. Install fuel inlet connection with same type threads as
drained at engine shutdown.
gear pump. Current gear pumps use a 3/4 inch-16 UNF
3. Assemble No. 4 hose or tubing to valve and run to
threaded connection with an "O" ring. Previous gear
fuel tank.
pumps had 3/8 inch NPTF inlet connection. Don't let
Note: All engines using flanged type PT injectors, vented
pipe sealer, used on NPTF type, enter gear pump. Use
or not vented, must have cooling kit drain line returned
sealer sparingly to keep out of pump. Cover connection
directly to the fuel tank. Any engine with cylindrical
to keep out dirt.
injectors may have cooling kit drain line connected to
4. Install cooling check valve and/or elbow into top of
injector drain line or be returned to fuel tank.
gear pump if used.
Shut-Down Valve And Pulsation Damper
1. Install the shut-down valve with new "0" ring on fuel
REFER TO FUEL PUMP CALIBRATION.
pump housing.
2. Install damper with new "0" ring to the gear pump.
Torque capscrews to 11/13 foot pounds [15 to 18 N. m].
Fuel Pump Cooling Kit PT (type G)
Cooling kit is used to prevent maximum fuel temperature
from exceeding 250 deg. F [121 deg. C] under any
operating conditions. Fig. 5-110
Note: This kit is required when long periods of down hill
operations are encountered.
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