Remove twelve mounting bolts securing the supply manifold to the cylinder head. Remove the supply manifold and gasket. See Figure
Removing Supply Manifold
Perform the following steps to clean the supply manifold:
Insert a stiff nylon brush into the oil and fuel galleries of the supply manifold for cleaning.
To avoid injury from flying debris when using compressed air, wear adequate eye protection (face shield or safety goggles) and do not exceed 40 psi (276 kPa) air pressure.
Use compressed air to clean out debris from the oil gallery.
Perform the following steps to check for warpage:
Using a straight edge and feeler gage, check the supply manifold gasket surface for warpage, utilizing the checking pattern shown. See Figure
High Pressure Pump Removal
It is not necessary to remove the injection pressure relief valve from the high pressure pump prior to removal of the pump. However, the solenoid, sleeve and tinnermann nut can be removed for easy access to the high pressure pump mounting bolts.
For engines with Serial No. 988151 and up, disconnect the wiring harness from the IPR valve.
Remove the tinnermann nut securing the solenoid to the IPR valve. Remove sleeve and solenoid.
Unscrew the IPR valve from the high pressure pump, using a 28 mm (11/8 in.) deep wall socket.
Before performing the next procedures, ensure the high pressure pump reservoir has been drained of oil. Drain the reservoir by removing the engine oil temperature sensor from the rear half of the front cover. Extract oil by inserting the tube from the hand operated vacuum pump tool,J 39257
, into the cover.
If the IPR valve has not been removed, ensure the IPR valve solenoid has been disconnected from the main wiring harness.
Ensure the lube oil supply hose has been disconnected. Refer to
Remove two capscrews securing the high pressure lube pump to the front cover. Remove the pump and gasket from the front cover. See Figure
2. High Pressure Oil Pump
High Pressure Oil Pump Removal
High Pressure Pump Installation
Follow these steps to install the high pressure lube oil pump.
Install a new face seal into the groove of the front cover and place the high pressure pump into its location.