11 31 540 Checking timing chain for elongation and replacing chain tensioner (N47)

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Special tools required:

IMPORTANT: Measurement of timing chain is only possible during manual cranking (dynamic).
An engine start is not permissible.
Cranking the engine only with an installed special tool (chain tensioner) is permissible.

IMPORTANT: Do not crank engine against direction of rotation , apply mark to vibration absorber.

Necessary preliminary work:

REMOVE CHAIN TENSIONER , remove sealing ring.
Start diagnosis test module in:
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Function structure

Power train

Diesel fuel electronics

Engine mechanics

Timing chain

IMPORTANT: Cranking the engine only with an installed special tool (chain tensioner) is permissible.

Install special tool 2 353 281without sealing ring.

Install special tool 2 353 281without shim.

Tightening torque: 11 12 2AZ .

Fig 1: Installing Special Tool (2 353 281)

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IMPORTANT: Do not crank engine against direction of rotation , apply mark to vibration absorber.

Crank engine with special tool 11 6 480 .

Measurement of timing chain.

Crank engine at constant speed in direction of rotation 4 times .

Determine minimum dimension on special tool 2 353 281 with the aid of a second person.

Fig 2: Special Tool (11 6 480)

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Determine protrusion or short length of the measuring pin on special tool 2 353 281 (see Fig 3).

Graphic: A

Minimum protrusion greater than 4 mm (indentation visible).

Fig 3: Special Tool (2 353 281) Protrusion (Indentation Visible)

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Graphic: B

Minimum protrusion 4 mm (indentation not visible).

Fig 4: Special Tool (2 353 281) Protrusion (Indentation Not Visible)

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Graphic: C

Minimum protrusion 2 mm.

Fig 5: Special Tool (2 353 281) Protrusion (Minimum)

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Graphic: D

Measuring pin flush with reference surface (see arrow).

Fig 6: Installing Special Tool (2 353 281)

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Graphic: E

Short length to reference surface (see arrow).

Fig 7: Installing Special Tool (2 353 281)

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Installation note:

Follow diagnosis instruction.