Cummins 4BT – Fuel Injection Pump Replacement (In-line) – Installation

Make sure the engine has Cylinder No. 1 at TDC.

The fuel injection pump also has a timing pin (1), located in the governor housing, to position the pump shaft to
correspond with TDC for Cylinder No. 1. The pin is to be reversed and stored in the housing (2) after the pump is
installed.

Remove the timing pin.

If the timing tooth is not aligned with the timing pin hole, rotate the fuel injection pump shaft until the timing tooth
aligns.

Reverse the position of the timing pin so the slot of the timing pin will fit over the timing tooth in the pump.
Install and secure the timing pin with the access plug.

Use a 50/50 mixture of clean engine oil and STP or equivalent to lubricate the gear cover housing to ensure
the fuel injection pump will slide into the gear cover hous­ing easily.

Also lubricate the mounting flange of the fuel injection pump.
NOTE: The P7100 fuel injection pump driveshaft has a pro­vision for a Woodruff key, however, it is not required. Timing mark alignment is not required for the P7100 drive gear.
Caution: The fuel injection pump drive gear inside di­ameter and the shaft outside diameter must be clean and
dry before installing the gear.

Slide the pump shaft through the drive gear and position the pump flange onto the mounting studs.
Push the pump forward until the mounting flange and o-ring are properly fitted into the gear housing bore.

Do not attempt to pull the pump flange into the gear housing with the mounting nuts as damage to housing will
occur.

15 mm
Install the mounting nuts.
Torque Value: 43 N*m [32 ft-lb]

30 mm
Install the retaining nut and washer.
Torque Value: 10 to 15 N«m [7 to 11 ft-lb]
To prevent damage to the timing pins, do not exceed the torque value given. This is not the final torque value for
the retaining nut.

Disengage the engine timing pin.

24 mm
Remove the fuel injection pump timing pin plug, Reverse the position of the timing pin and install the timing pin,
plug, and sealing washer.
Torque Value: 15 N*m [11 ft-lb]

30 mm
Tighten the fuel injection pump drive nut.
Torque Value: 165 N*m [122 ft-lb]
Install the gear cover access cap hand tight.

10 mm
Install the fuel injection pump mounting bracket capscrews.
Tighten all capscrews by hand to ensure proper align­ment.
Torque Value: 24 N*m [18 ft-lb]

Install the fuel lines, AFC line, control linkage and turbo­ charger wastegate line.
Torque Values:

High Pressure Fuel Lines                        30 N«*m [22 ft-lb]
Low Pressure Fuel Supply Fitting           15 N*m [11 ft-lb]

9/16 in
Install the external oil feed line at the inboard side of the fuel injection pump and the main oil rifle.

19 mm
Caution: The pressure of the fuel in the high pressure line is sufficient to penetrate the skin and cause serious
bodily harm.
Vent the high pressure fuel lines. Loosen the fitting at the number 1 injector. Place the fuel control in the run posi­tion. Crank the engine so air can bleed from the fuel lines.
Then, tighten the fitting.
Torque Value: 30 N®m [2 2 ft-lb]

Vent each high pressure line separately until the engine runs smoothly.