Valve Timing, Checking

Special tools and workshop equipment required

Spark Plug Removal Tool: 3122B

Fig 1: Identifying Spark Plug Removal Tool 3122B
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Dial Indicator Set: VAS6341

Fig 2: Identifying Dial Gauge Set VAS 6341
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Dial Gauge Adapter: T10170A

Fig 3: Dial Gauge Adapter T10170A
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Wrench - 21mm: T40263

Fig 4: Identifying Wrench - 21mm
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Adapter: T40314

Fig 5: Adapter T40314
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Procedure

Preliminary work may be required depending on the model. Refer to CHAIN DRIVE .

-- Remove the upper timing chain cover. Refer to TIMING CHAIN COVER, REMOVING AND INSTALLING, ENGINE WITH TWO CAMSHAFT ADJUSTERS .

-- If not removed, remove the noise insulation. Refer to OVERVIEW - NOISE INSULATION .

-- Turn the crankshaft with the Wrench - 21mm: T40263 , Adapter: T40314 and 24 mm socket on the vibration damper in the direction of engine rotation until the marks -1 and 2- are almost on top.

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-- Removing the spark plug from cylinder 1 with the Spark Plug Removal Tool: 3122B .

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-- Install the Dial Gauge Adapter: T10170A all the way into the spark plug thread.

Fig 6: Identifying Adapter For Dial Gauge

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-- Insert the Dial Gauge Set: VAS6341 with the Dial Gauge Adapter Extending Piece: T10170A/1 all the way and secure it with the locking nut -arrow-.

-- Turn the crankshaft slowly in the direction of the engine rotation until the maximum dial reading is reached. When the maximum dial reading is reached (turning point of the meter) position the piston at >>TDC<<.

TIP:

If the crankshaft was turned past "TDC", turn the crankshaft two more turns in the direction of engine rotation. Do not turn the engine in the opposite direction of the engine rotation.
The combination of the following shown Wrench - 21mm: T40263 , Adapter: T40314 and 24 mm socket are better suited than the Counterhold - Vibration Damper: T10355 for positioning the vibration damper.

With Marks in the Cylinder Head Cover

Fig 7: Identifying Vibration Damper With Counterhold - Vibration Damper T10355

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The markings -1- on the camshaft chain sprockets must align with the markings -2 and 3- on the cylinder head.

Without Marks in the Cylinder Head Cover

Fig 8: Identifying Counterhold Tool And Markings

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The notch on the vibration damper and the marking on the lower cover for timing chain must be opposite one another -arrow-.
The markings -1- on the camshaft chain sprockets must point upward.

-- Measure the distance from the edge -1- to the marking -2- on the exhaust camshaft chain sprocket.

Fig 9: Exhaust Camshaft Chain Sprocket Distance Markings

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Specified value: 74 to 77 mm.

-- Once the specified value is reached, measure the distance between the mark on the exhaust camshaft chain sprocket -3- and the mark on the intake camshaft chain sprocket -4-.

Fig 10: Exhaust Camshaft Chain Sprocket Measuring Distance

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Specified value: 124 to 127 mm.

NOTE:

If one tooth has an offset, there will be a deviation of approximately 6 mm from the specified value. The timing chain must be installed again if an offset is determined.

There are additional procedures depending on the model. Refer to CHAIN DRIVE .

Tightening Specifications

Refer to OVERVIEW - NOISE INSULATION .