12 42 550 Replacing battery positive lead between starter, alternator and battery positive terminal (S63)

Necessary preliminary tasks

Read out fault memory of DME control unit
Turn off ignition
Disconnect BATTERY NEGATIVE LEAD .
Remove RIGHT INTERCOOLER .
Remove INTAKE AIR MANIFOLD .

Open cover.

Release screw (1).

Tightening torque 12 42 3AZ .

Remove battery positive lead (2) from battery positive terminal.

Fig 1: Identifying Battery Positive Lead And Mounting Screw

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Release clamps (1) and (2).

Replace clamps.

Pull off wastegate lines (3) from air duct.

Fig 2: Identifying Wastegate Lines And Clamps

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Release coolant lines from the clamps (1).

Unclip positive battery cable (2) from holder.

Fig 3: Identifying Coolant Lines Clamps And Positive Battery Cable

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Release clamps (1).

Replace clamps.

Release screw (2).

Tightening torque 13 71 13AZ .

Release screws (3) from charge air cooler.

Tightening torque 13 71 6AZ .

Remove air duct (5).

Fig 4: Identifying Charge Air Cooler Screws, Air Duct And Clamps

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Release screws (1).

Tightening torque 13 71 1AZ .

Pull off air ducts (2) from the exhaust turbocharger and place to one side.

Check gaskets for damage. Renew damaged gaskets.

Fig 5: Identifying Exhaust Turbocharger Air Ducts And Mounting Screws

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Unlock plug (1) and remove.

Detach cover (2) and release nut underneath.

Tightening torque 12 42 1AZ .

Installation:

Reinstall cover (1) without fail.

Risk of short circuits!

Disconnect positive battery cable from alternator.

Fig 6: Identifying Cover And Plug Connection

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Release battery positive lead (1) from retainers (2).

Fig 7: Identifying Battery Positive Lead And Retainers

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Release battery positive lead (1) from retainer (2).

Fig 8: Identifying Battery Positive Lead And Retainers

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Release screws (1).

Tightening torque 12 42 7AZ .

Release nut (2) on starter.

Tightening torque 12 42 2AZ .

Disconnect battery positive lead (3).

Fig 9: Identifying Battery Positive Lead, Starter Nut And Mounting Screws

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NOTE: Reassemble the vehicle.

Check stored fault message.

Delete fault memory.