TK 56433-5-MM-EN
47
Trochoid Feed Pump Outlet Pressure
Cranking
15-30 psi (103-206 kPa)
Low Speed
30-50 psi (206-345 kPa)
High Speed
65-87 psi (450-600 kPa)
Figure 41.
Trochoid Feed Pump Location
1.
Trochoid Feed Pump Outlet Pressure Port
2.
Trochoid Feed Pump
Trochoid Feed Pump Leaks
Internal – If the seal in the trochoid feed pump fails, it
could allow some fuel to leak into the engine oil. A
faulty injection nozzle can also dilute the engine oil
with fuel. Replace the trochoid feed pump if the engine
oil is being diluted with fuel and a faulty injection
nozzle or fuel transfer pump is not the cause.
External – Replace the O-ring seal between the trochoid
feed pump and the injection pump if oil is leaking.
Torque the bolts to prevent leaks (6 to 7 ft-lb [8 to 10
N•m]).
Replace all O-rings if fuel is leaking. Torque the Allen
head screws and Hex head bolts to prevent leaks (6 to 7
ft-lb [8 to 10 N•m]).
Trochoid Feed Pump Replacement
Use the following procedure to replace the trochoid
feed pump.
1. Remove the four hex head screws that attach the
trochoid feed pump to the injection pump (see
). Do not remove the two Allen head
screws.
Figure 42. Trochoid Feed Pump Removal
1.
Allen Head Screws (Do Not Remove)
2.
Hex Head Screws
2. Remove the trochoid feed pump from the injection
pump.
N
No
otte
e:: The gear on the trochoid feed pump is
lubricated with engine oil. Some engine oil
might leak out of the injection pump when
the trochoid feed pump is removed. The
trochoid feed pump does not need to be
timed when it is installed.
3. Clean the area on the injection pump from which
the trochoid feed pump was removed.
4. Place new O-rings on the new trochoid feed pump
and make sure it is clean.
Figure 43.
Trochoid Feed Pump
1.
O-Rings
5. Place the new trochoid feed pump on the injection
pump.
