2.8 Removing and installing tensioning roller

– Make sure that brake indicator on display is green -A-. – It must not be yellow or red.

– Seal camshaft adjusters -1- and -2- using suitable plugs -Afrom engine bung set - VAS 6122- . – Fit a new piece of paper into plugs -A- to catch the engine oil. – The plug for the camshaft adjuster -1- on exhaust side must be pushed in slightly. – Turn crankshaft 2 turns in direction of rotation of engine. – Screw in locking pin - T10340- . – Set piston for cylinder no. 1 to TDC position ⇒ “4.7 Setting piston to TDC position”, page 155 . – Check valve timing ⇒ “2.5 Checking valve timing”, page 187 .

NOTICE

Adjust valve timing as precisely as possible. The settings must be as close to the specifications as possible. The valve timing must not be outside the tolerance limits.

– Read valve timing, and compare it with specifications.

Specified angle in °

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Inlet camshaft Exhaust camshaft

+1.1° ±1.5° +0.8° ±1.5°

– If necessary, adjust timing again ⇒ “2.6 Adjusting valve timing”, page 189 . Assembly is carried out in the reverse order. Observe the follow‐ing: – Unscrew locking pin - T10340- . – Make sure that brakes a are released on both sides.

– Tighten camshaft adjuster on intake camshaft to specified final torque ⇒ “3.4.1 Removing and installing camshaft adjuster for inlet camshaft”, page 211 . – Tighten camshaft adjuster on exhaust camshaft to specified final torque