Valve Timing, Adjusting

Valve Timing, Adjusting

Special tools, testers and auxiliary items required

• Torque Wrench (5-50 Nm) (V.A.G 1331)

• Torque Wrench (40-200 Nm) (V.A.G 1332)

• Locking Pins (T03006)

• Multipoint Socket (T10035)

• Counterhold Tool (T10172)

• Camshaft Clamp (T40070)

• 2 M8 x 16 Bolts

Modifying the Counterhold Tool (T10172)






- Unscrew the adapter (T10172/1) and screw in the 2 M8 x 16 bolts - A -.

• The valve timing must be adjusted if the camshaft sprocket or adjuster were loosened during repairs or if the valve timing is not set.

Securing the Camshafts if the Valve Timing is Correct

- Remove the timing chain cover. Refer to => [ Timing Chain Cover ] Service and Repair.

- Remove the cylinder head cover. Refer to => [ Cylinder Head Cover ] Service and Repair.

- Secure the crankshaft as described in the "valve timing, checking" procedure. Refer to => [ Valve Timing, Checking ] Valve Timing, Checking.

- Install the camshaft clamp (T40070) as shown onto the camshafts and tighten the bolts to 20 Nm.






If the bolts are difficult to install, install an 18 or 19 mm open end wrench - A - to the opening on the exhaust camshaft and rotate the camshaft slightly in the - direction of the arrow - to remove any play in the chain.

- Relieve the tension on the timing chain. To do so, insert a screwdriver of appropriate size between the piston for the chain tensioner and tensioning rail and press the screwdriver in the - direction of arrow -.






- Secure the completely pressed in piston using the locking pin (T03006). the pin must be inserted until it stops.

Securing the Camshafts if the Valve Timing is not Correct

- Remove the timing chain cover. Refer to => [ Timing Chain Cover ] Service and Repair.

- Rotate the crankshaft to Top Dead Center (TDC) for cylinder 5. Refer to => [ Crankshaft, Locking ] Procedures. Do not lock the crankshaft using the locking pin (T40069).

- Rotate the crankshaft so that the camshaft clamp (T40070) can be installed easily onto the camshafts as shown.






- Tighten bolts for the camshaft clamp (T40070) to 20 Nm.

Remove the Camshaft Sprocket or Adjuster

- Relieve the tension on the timing chain. To do so, insert a screwdriver of appropriate size between the piston of the chain tensioner and tensioning rail and press the screwdriver in the - direction of the arrow -.






- Secure the completely pressed in piston using the locking pin (T03006). The pin must be inserted until it stops.

- Remove the bolts - 1 and 4 - using the multipoint socket (T10035) and remove the actuator - 2 - and the sprocket - 3 -.

If necessary, the sprocket - 3 - must be pried off lightly using a screwdriver.

• Lock the crankshaft, refer to => [ Crankshaft, Locking ] Procedures if not yet locked. The crankshaft must only be rotated slightly around the TDC point for this. Otherwise there is a risk the valves will rest on the pistons.

Adjusting the Timing

• The crankshaft is locked using the locking pin (T40069)

• The camshafts are secured by the camshaft clamp (T40070)

• The chain tensioner is tensioned

- Place the adjuster - 2 - and sprocket - 3 - in the timing chain as illustrated. Position the adjuster and sprocket onto the camshafts and install new bolts - 1 and 4 - and tighten them by hand.






The adjuster and sprocket must still be able to be rotated, however they must not tilt.

• Make sure that timing chain lies correctly in the tensioning and guide rails.

- Relieve the tension on the chain tensioner by pressing in the piston and pulling out the locking pin (T03006).

- Attach the modified counterhold tool (T10172) to the exhaust camshaft sprocket - 4 -.






• A second technician is needed for the following steps.

- Hold the timing chain at preload by pressing the counterhold tool (T10172) in the - direction of the arrow -.

- Tighten the bolt - 2 - for the intake camshaft adjuster and then the bolt - 3 - for the exhaust camshaft sprocket to 60 Nm.

Then, tighten the bolts - 2 and 3 - an additional 90° (1/4) turn.

• When applying the additional 90° torque angle, the timing chain must no longer be held at preload.

- Remove the camshaft clamp (T40070).






- Remove the locking pin (T40069) for securing the crankshaft.






- Turn the crankshaft 2 turns in engine rotation direction and check the valve timing. Refer to => [ Valve Timing, Checking ] Valve Timing, Checking.

If the valve timing is not correct:

- Loosen the intake camshaft adjuster and exhaust camshaft sprocket bolts again and adjust the valve timing again (replace the bolts).

The rest of the installation follows the reverse of the removal procedure. Note the following:

• Remove the locking pin (T40069) from the rear of the cylinder block and install the locking bolt.

• Fill the coolant. Refer to => [ Coolant, Draining and Filling ] Service and Repair.