Clean intake ports

CAUTION: Swirling dirt particles caused by compressed air.
Injury hazard!

Collect dirt particles, e.g. when blowing out, use cloth to do so.
Wear safety goggles.

NOTE: RISK OF DAMAGE
Engine damage due to walnut shell granules in the combustion chamber.
If walnut shell granules penetrate the combustion chamber while cleaning the intake ports, engine damage may occur.

Always clean the intake port with valves of the relevant cylinder closed.
Set the piston of the relevant cylinder to the TDC.
If walnut shell granules have entered the combustion chamber: Do not turn or start the engine hand force. Disassemble the cylinder head and clean all components.

Ready the special tool 2 208 034 , the walnut shell granules and a standard vacuum cleaner.

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Have the special tool 2 356 969 ready.
NOTE: TECHNICAL INFORMATION
The front area of the beam probe is marked with two notches. These may additionally be highlighted in color.
During the blasting process, only pull the beam probe out of the jet vacuum adapter until the mark becomes visible.

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Observe the mark (1).
Open the blasting device (1).

Pour in the walnut shell granules (2).

TECHNICAL DATA SPECIFICATION

Walnut shell granules
Quantity for each blasting process	2I

Close the blasting device (1).

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Close the valve (1) on the blasting device (2).

Connect compressed air (3).

TECHNICAL DATA SPECIFICATION

Cleaning the intake ports
Operating pressure	6 bar... 8 bar

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Attach the beam probe (2) to the blasting device (1).

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Connect the vacuum cleaner (1) to the special tool 2 410 274 .

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Prepare 3 standard feeler gauges (1) with a thickness of 0.05 mm.
Cut the 3 feeler gauges (1) to a length of 25 mm.

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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Position the prepared feeler gauges (1) on the blow-by-ports of the cylinder head (2).
Make sure that the blow-by channels on the cylinder head (2) through the feeler gauges (1) have been closed.

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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Insert and position the cylinder head covers (1).
Make sure that the feeler gauges (arrows) have been positioned correctly between the cylinder head cover (1) and the blow-by channels of the cylinder head (2).

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NOTE: TECHNICAL INFORMATION
When assembling, it is essential to observe screwing sequences and tightening torques.
Failure to comply with the regulations can lead to leaks and damage.

Fig 1: Cylinder Head Cover Screws Tightening Sequence
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Guide in and install the cylinder head cover (A).

Tighten the screws in order from (1) to (15).

TIGHTENING TORQUE SPECIFICATION

Cylinder head cover to cylinder head
M6x30	Tightening torque	8 Nm
	Tightening torque	11 Nm

Clean the marked areas (1) with a brush.

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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Insert the special tool 2 410 274 in the tangential port (1) of the cylinder to be cleaned.

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NOTE: TECHNICAL INFORMATION
Conduct the following operation with the assistance of a second person.
Insert the special tool 2 208 033 in arrow direction in the special tool 2 410 274.

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Turn on the vacuum cleaner (1).

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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Move the beam probe in the arrow direction and turn it.
This removes all contamination in the tangential port.
Open the valve (1).

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Slide the locking lever (1) forward in arrow direction.
To release compressed air: Operate the valve (2).
To release the walnut shell granules and compressed air: Operate valve (1) and (2).

Clean the swirl port.

TECHNICAL DATA SPECIFICATION

Cleaning the intake ports
Blast duration with walnut shell granules	Approx. 20 s
Blast duration with pure compressed air for the complete blowing out of walnut shell granules	Approx. 10 s

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Close the valve at the beam probe.
» Check the pressure drop at the pressure tester.
Repeat the following work steps consecutively on all other cylinders:
- Turn the piston of the cylinder to be cleaned to the top dead center.
- Clean intake ports.
Loosen screws in the order (15) to (1).
Feed out and remove the cylinder head cover (A).

Fig 2: Cylinder Head Cover Screws Loosening Sequence
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NOTE: Schematic diagram is for example purposes. Some parts may differ in certain details.
Feed out and remove the feeler gauges (1) on the blow-by-ports of the cylinder head (2).

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Clean the blow-by channels (2) with an air gun (1).

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Make sure that the blow-by channels (1) are free from walnut shell granules.

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Make sure that the intake ports (1) are free from walnut shell granules.

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