
Engine Maintenance
115
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 Figure 190). Do not remove the two Allen
head screws.
2. Remove the trochoid feed pump from the
injection pump.
NOTE: 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.
1.
Trochoid Feed Pump Outlet Pressure Port
2.
Trochoid Feed Pump
Figure 189: Trochoid Feed Pump Location
1
2
1.
Allen Head Screws (Do Not Remove)
2.
Hex Head Screws
Figure 190: Trochoid Feed Pump Removal
1.
O-Rings
Figure 191: Trochoid Feed Pump
2
1
1
1
1