Variable Valve Timing Unit - Checking and Adjusting: Other Volvo V70 II

Variable valve timing unit, checking and adjusting (B5XX4S-B5XX4S3; 1999-2001)

Special tools

9995451

9995452

Installing and adjusting the variable valve timing unit/timing gear pulley on the camshaft

Note. This procedure must be carried out with precision as any deviation could generate a fault symptom.

Scheme 505

Remove the starter motor mounting screws. Pull out the starter motor and put it aside. Remove the plug of the gauge hole. Rotate the crankshaft slightly clockwise. Install: 9995451 . Make sure that it bottoms against the engine block.

Scheme 506

Turn the crankshaft counterclockwise to its stop against the crankshaft adjustment tool. Check that the marking on the crankshaft timing gear pulley aligns with the marking on the oil pump.

Scheme 507

Note. Oil the center screw before installation.

Press the variable valve timing unit/timing gear pulley onto the camshaft. Install the center screw (1) that holds the variable valve timing unit to the camshaft. Do not tighten yet .

Slacken off, but do not remove the screws (2) which secure the timing gear pulley to the variable valve timing unit.

Position the upper timing cover.

Scheme 508

Turn the timing gear pulley so that the screws at the oval holes are in the limit position. Continue turning clockwise until the timing gear pulley's marking is 1 tooth before the marking on the upper timing cover.

Check that the timing gear pulley is still in the limit position in the oval holes.

Tighten the center screw (1) in the VVT unit to 120 Nm .

Check that the variable valve timing unit does not rotate when tightening. Install the center plug and tighten to 35 Nm .

Install the belt pulley on the exhaust camshaft : Install the belt pulley on the intake camshaft with three screws; do not tighten yet .

Check that the markings on the belt pulley and the upper timing cover align.

Installing the timing belt

Install the belt in the following order

1. Fit the timing belt over the pulley on the crankshaft
2. the idler pulley
3. cam wheel, exhaust camshaft
4. water pump
5. belt tensioner.

Scheme 509

Turn the variable valve timing unit clockwise to the stop.

Note. Hold the VVT unit fixed in the limit position clockwise when the belt if fitted.

Check that the markings on the belt pulley and the upper timing cover align.

Scheme 510

Fit the timing belt over the intake camshaft's cam wheel.

Variable valve timing unit, checking and adjusting (B5244S6; 2003-2006, B5XX4TX; 2002-)

Special tools

9995451

9995452

Note. The illustrations in this service information are used for different model years and/or models. Some variation may occur. However, the essential information in the illustrations is always correct.

Note. This procedure must be carried out with precision as any deviation could generate a fault symptom.

Aligning the crankshaft

Turn the crankshaft counter-clockwise until it stops against the adjustment tool.

Check that the marking on the crankshaft timing gear pulley corresponds to the marking on the oil pump.

Scheme 511

Note. Oil the center screw before installation

Push on the variable valve timing unit/timing gear pulley on the camshaft.

Install the center screw (1) which secures the variable valve timing unit to the camshaft. Tighten slightly.

Slacken off, but do not remove the screws (2) which secure the timing gear pulley to the variable valve timing unit.

Turn the timing gear pulley until the screws at the oval holes are in the center position. Tighten the screws (2) slightly.

Turn the variable valve timing unit clockwise to its limit position so that the unit is in its end position.

Position the upper timing cover

Scheme 512

Undo the center screw and continue turning clockwise until the timing gear pulley marking aligns with the marking on the upper timing cover.

Tighten the center screw in the variable valve timing unit. Tighten. See: Summary of specific components and tightening torques .

Note. Variable valve timing units do not have return springs and are easily thrown out of position when the camshaft belt is installed. Check that the markings align.

Install the belt in the following order

1. the idler pulley
2. intake cam
3. exhaust cam
4. water pump
5. tension pulley.

Scheme 513

This adjustment is to be made with a cold engine.

A suitable temperature is approximately 20 °C/68 °F.

At a higher temperature, for example with a warm engine or a higher ambient temperature, the needle is further to the right.

The illustration shows the position of the indicator when aligning the timing belt tensioner at approximately 20 °C/68 °F.

Note. There are two different tensioners depending on model year.

Fix the belt tensioner center screw in position and turn the belt tensioner eccentric clockwise until the tensioner indicator passes the marked position and reaches the end position. Then turn the eccentric back so the indicator reaches the marked position shown in the illustration. Tighten the center screw. See Summary of specific components and tightening torques .

Check that the indicator is in the correct position.

Scheme 514

Slacken off the 3 x screws for the timing gear pulley slightly (applies to both timing gear pulleys).

Install the center plug in the variable valve timing unit. Tighten. See: Summary of specific components and tightening torques .

Hold the center plug at 25 Nm at the same time as tightening the 3 x screws on the camshaft timing gear pulley to: Summary of specific components and tightening torques .

Tighten the 3 x screws on the timing gear pulley for the intake camshaft. See: Summary of specific components and tightening torques . This is to ensure that the variable valve timing (VVT) unit is in its end position when the timing gear pulley is tightened.

Scheme 515

Remove

1. «9995452»(ref-403953-S02369714572011061000000) from the rear of the camshafts
2. «9995451»(ref-403953-S26663901482011061000000) . Install new plugs with new sealing washers. Tighten. See: «Summary of specific components and tightening torques»(ref-406973-S28846051262011070100000) .

Checking the markings and belt tension.

Position the upper timing cover.

Turn the crankshaft 2 rotations. Check that the markings on the crankshaft and timing gear pulleys correspond.

Remove the upper timing cover.