Valve Timing, Adjusting: Procedure

WARNING: This page is about a different variant/trim than selected.

-- Position the engine in the "TDC position for cylinder 1". Refer to VALVE TIMING, CHECKING .

-- Remove the toothed belt from the camshafts. Refer to TOOTHED BELT, REMOVING FROM CAMSHAFTS .

Valve Timing, Adjusting

Replace the bolts that were tightened with an additional turn.
Replace the seal for the plug if it is damaged.

-- Check the "TDC" position of the camshaft and crankshaft:

Attach the :T10494 to the camshaft housing.

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:T10340 installed all the way into the cylinder block and tightened to 30 Nm.

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Crankshaft in direction of engine rotation touching the :T10340 = "TDC" position.

CAUTION:

- Do not turn the crankshaft out of TDC.

-- Replace the bolts -1 and 2- for the camshaft sprockets and install them loosely. Refer to INTAKE CAMSHAFT ADJUSTER, REMOVING AND INSTALLING .

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The camshaft sprockets must still turn on the camshafts and may not tip.

The metal tab -arrow- on the tensioning roller must fit into the cast depression in the cylinder head.

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CAUTION:

- Never bend the toothed belt with a radius less than 25 mm.

The bend radius -r - on the toothed belt -2- must for this reason not be under 25 mm (approximately half the diameter of the toothed belt -1- on the crankshaft).

Follow The Sequence When Installing The Toothed Belt

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-- Pull the toothed belt upward and route it over the idler roller -4-, the tensioning roller -1- and the camshaft sprockets -2 and 3-.

-- Turn the tensioning roller eccentric pulley -2- in the direction of -arrow- using the :T10499A until the pointer -3- is approximately 10 mm to the right of the setting window.

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-- Turn back the eccentric so that the pointer is exactly inside the setting window.

NOTE:

The :VAS6583 must be used to tighten.

When adjusting the tightening specification on the :VAS6583 the specified actual dimension must be entered on the :T10500 in the torque wrench.

-- Hold the eccentric in this position.

-- Tighten the bolt -1-.

-- Use the :T10500 with :VAS6583 to do this.

NOTE:

If the engine is turned further or is run, the position of the pointer -3- in the setting window may differ slightly. This difference does not have any influence on the toothed belt tension and the valve timing.

The bolts must first be tightened to the final tightening specification (additional turn) once the valve timing has been checked and is OK.

-- Tighten the bolts for the camshaft adjuster to the pre-tightening specification. Refer to Installing .

CAUTION:

- Never use the camshaft positioning tool as a counterholder.

-- Remove the :T10340 .

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-- Remove the bolt -arrow- and remove the :T10494 .

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Checking Valve Timing After Adjusting

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-- Turn the crankshaft two turns in direction of engine rotation.

-- Install the :T10340 all the way into the cylinder block and tighten to 30 Nm.

-- Turn the crankshaft farther all the way in direction of engine rotation.

The locking pin is touching the crankshaft counterweight.

NOTE:

The :T10340 locks the crankshaft only in direction of engine rotation.

It must be easy to insert the :T10494 .

Do not use a hammer to install the camshaft positioning tool.

If the :T10494 cannot be inserted easily:

-- Use the :T10487 to push on the toothed belt in the direction of -arrow-.

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-- Insert the :T10494 all the way in the camshafts.

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-- Tighten the bolt -arrow- hand-tight.

If the :T10494 cannot be inserted, then the valve timing is not OK:

-- Adjust the valve timing again. Refer to VALVE TIMING, ADJUSTING .

If the :T10494 can be inserted, then the valve timing is OK.

-- Remove the :T10340 .

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-- Remove the bolt -arrow- and remove the :T10494 .

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-- Tighten the bolts -1 and 2- to the tightening specification. Refer to Installing .

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There Is A Risk Of Damaging The Engine

Make sure the :T10340 and the :T10494 are removed after completing the work.

Further assembly is performed in reverse order.