11 12 670 Cleaning intake port with walnut shell granulate (N14)

Special tools required:

IMPORTANT: The intake valves of the corresponding cylinder must be closed when cleaning the intake ports.

Necessary preliminary tasks:

IMPORTANT: Determine the top dead center via the spark plug bore hole using the special tool 2 302 630.

Crank engine at central bolt.

Fig 1: Determining Top Dead Center Via Spark Plug Bore Hole Using Special Tool 2 302 630

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Prepare peener (81 29 2 208 034) with walnut shell granulate.

Fig 2: Identifying Peener (81 29 2 208 034)

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Position extraction adapter (81 29 208 038) over intake port of first cylinder.

Fig 3: Positioning Extraction Adapter (81 29 208 038) Over Intake Port Of First Cylinder

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Hole for probe (see arrow).

Fig 4: Locating Hole For Probe

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Insert suitable probe (3) in extraction adapter (81 29 2 208 038).

Connect compressed air connection.

Valve (1) - compressed air.

Switch on vacuum cleaner.

Valve (2) - walnut shell granulate.

Procedure:

Cleaning time approx. 30 seconds.

The cleaning result is improved by moving the probe (3) in a circular pattern.

Operate valve (1) for an additional 10 to 15 seconds to assist cleaning.

Fig 5: Identifying Extraction Adapter (81 29 2 208 038) And Valves

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NOTE: Check that no walnut shell granulate remains in the intake ports.

Assemble engine.