13 51 065 Removing and installing/replacing left high pressure pump (S63 B44 T 0)

Special tools required:

13 5 160

WARNING: Observe warning on cylinder head cover.
Disconnect NEGATIVE BATTERY TERMINAL (risk of fire due to short circuit on removal).
Electric fuel pump starts up automatically when door is opened!
Carry out installation work on fuel system only with coolant temperature below 40 °C.

IMPORTANT: Wear full face guard and protective gloves.
Fuel can emerge spontaneously at high speed when the high pressure line is released!

IMPORTANT: Adhere to conditions of absolute cleanliness when working on the high-pressure fuel system.
Introduced contaminants can cause malfunctions in the system!

Do not allow any dirt particles or foreign bodies to get into the system.
Remove all traces of dirt before removing lines or separate components.
Use only fluff-free cloths.
Seal all fuel system openings with protective caps or plugs.

IMPORTANT: Ignition coils must not be contaminated by fuel.
The resistance of the silicone material is reduced significantly by contact with fuel, which may cause the ignition coil to fail!
Cover ignition coil with suitable means.

Installation note:

Remove FAN COWL WITH ELECTRIC FAN

Recycling:

Fuel escapes when fuel lines are detached.

Catch and dispose of escaping fuel.

Observe country-specific waste disposal regulations.

Unlock and detach plug connections (1 and 2).

Release connector holder (3) from bracket and place to one side.

Loosen nuts (4) and remove ground cable.

Tightening torque 12 52 2AZ .

Fig 1: Identifying High-Pressure Pump Connector Holder And Plug Connection

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Unlock and disconnect fuel delivery line (1).

Close off fuel line with special tool 13 5 160 .

Unlock and disconnect vacuum line (2).

IMPORTANT: Ignition coils must not be contaminated by fuel.

Fig 2: Identifying Fuel Delivery And Vacuum Line

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Seal fuel lines with special tools (1) and (2) 13 5 160 .

Remove LEFT RAIL .

Fig 3: Identifying Seal Fuel Lines With Special Tools (13 5 160 And 13 5 162)

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Release nut (2) on retaining clip.

Tightening torque 13 53 7AZ .

Release screw (1).

Tightening torque 13 53 6AZ .

Release fuel feed line (3) on high-pressure pump.

Tightening torque 13 53 4AZ .

Fig 4: Identifying High-Pressure Pump Fuel Feed Line And Screws

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Installation note:

Observe the tightening sequence!

Tighten the fuel delivery line on the to high pressure pump.
Tightening torque 13 53 4AZ .
Apply tightening force to fuel delivery line at cylinder head cover.
Tightening torque 13 53 6AZ .
Tighten down retaining clips.
Tightening torque 13 53 7AZ .

IMPORTANT: High-pressure pump can be pretensioned by camshaft cams!

Slightly slacken screws (2) of high pressure pump (3). When the high pressure pump is pushed out, the engine must be turned to the bottom dead center at the central bolt of the crankshaft.

Unlock connector (1) and remove.

Unfasten screws (2).

Replace screws. Screws are coated with sealing compound.

Fig 5: Identifying High Pressure Pump Connector And Screws

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IMPORTANT: The pump plunger can fall out when the high-pressure pump (2) is pulled out!

Detach high-pressure pump (3) and remove.

Engine oil can escape when pump is detached; have a cleaning cloth ready.

Installation note:

Provisionally fasten screws (1) and tighten uniformly in 90° increments until final tightening.

Tightening torque 13 51 1AZ .

Place depth gauge (1) flat on fuel pump flange (see arrow) (shown on N43 engine).

Turn the engine at the central bolt of the crankshaft until the UT position of the camshaft is reached on the depth measuring slide.

Fig 6: Locating Fuel Pump Gauge

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Installation note:

Replace gasket (1).

Clean contact surfaces.

Fig 7: Identifying High Pressure Pump Gasket

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Assemble engine.

Check fuel system for tightness.

Check function of DME.