Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
13 51 004 Removing and installing/replacing high-pressure pump (M57TU, M57T2)
Special tools required:
Cover alternator with suitable auxiliary materials (risk of damage!).
Recycling:
Catch and dispose of escaping fuel and coolant.
Observe country-specific waste disposal regulations.
A high pressure pump with woodruff key groove is installed in the pump shaft from production date 11/2004.
Installation note:
Position the pump shaft so that the groove in the shaft lines up with the cast lug in the drive sprocket.
Necessary preliminary work:
- Remove intake PLENUM .
- Remove front engine guard.
- Remove fan cowl. See 17 11 035 REMOVING AND INSTALLING/REPLACING FAN COWL WITH ELECTRIC FAN (M57T2) .
- Remove alternator drive belt . See 11 28 010 REMOVING AND INSTALLING/REPLACING DRIVE BELT FOR ALTERNATOR (M57T2) or 11 28 050 REMOVING AND INSTALLING/REPLACING DRIVE BELT (ELASTOBELT) FOR A/C COMPRESSOR (M57TU/M57T2) .
- Drain coolant from radiator. See 17 00 005 DRAINING AND ADDING COOLANT (M57T2) .
- Remove plastic return pipe.
Disconnect the connector (1) on the HP pump.
Detach fuel feed line (2).
Detach fuel return line (3).
Release union nut of high pressure line (4) with special tool 13 5 020 .
Installation note:
Replacing the high pressure line.
Tightening torque: 13 53 8AZ .
Open screw plug (1).
Installation note:
Tightening torque: 11 14 4AZ .
Replace sealing ring.
Lightly oil sealing ring.
Release nut (1) and remove.
Installation note:
Tightening torque: 13 52 2AZ .
Screw special tool 13 5 192 into the gear case cover.
Screw special tool 13 5 191 fingertight without set screw (1) into the sprocket.
Screw in set screw (1) and pretension HP pump.
Unscrew nuts (1).
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.