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Home >> Audi >> 2005 >> A8 Quattro Sedan (4E2) V8-4.2L (BFM) >> Repair and Diagnosis >> Engine, Cooling and Exhaust >> Engine >> Seals and Gaskets >> Valve Guide Seal >> Service and Repair

Valve Guide Seal: Service and Repair






Valve Stem Seals

Special tools, testers and auxiliary items required

• Spark plug removal tool (3122B)

• Valve seal removal tool (3364)

• Valve stem seal driver (3365)

• Valve cotter asm/disasm device (VAS 5161)

• Adapter (T40012)

Removing

• Engine is removed. Refer to => [ Engine, Removing ] Engine, Removing.

- Remove the camshafts and adjusters, refer to one of the following:

• => [ Left Camshafts and Adjuster ] Left Camshafts and Adjuster.

• => [ Right Camshafts and Adjuster ] Right Camshafts and Adjuster.

- Using the (3122B), remove the spark plugs.

- Turn the roller rocker lever upward and secure it with a rubber band.





- Place the (VAS 5161/7) from the (VAS 5161) on the cylinder head.





- Secure the (VAS 5161/7) with the (VAS 5161/12).

- Insert the (VAS 5161/3) into the guide plate and loosen the stuck valve retainers using a plastic hammer.

- Install the (VAS 5161/6) with the (VAS 5161/5) into the (VAS 5161/7).





- Guide the (VAS 5161/8) into the (VAS 5161/7).

- Install the (T40012) with gasket by hand into the respective spark plug hole and apply constant pressure.

• Minimum pressure: 6 bar pressure

- Engage the (VAS 5161/2) at the (VAS 5161/6) and press down the (VAS 5161/8).

- At the same time, turn the knurled bolt of (VAS 5161/8) to the right, until the points engage in the valve retainers.

- Lightly move the knurled bolt back and forth, causing the valve retainers to be pressed apart and be captured in the (VAS 5161/8).

- Release the pressure fork.

- Remove the (VAS 5161/8).

- Remove the (VAS 5161/7).

• Pressurized air hose remains connected.

- Remove the valve stem seal using the (3364).





Installing

• For installing the valve stem seals, the (3365) must be drilled to 6.5 mm diameter.

• A plastic sleeve - A - is supplied with the new valve stem seals.





- Place the plastic sleeve - A - on the valve stem to prevent damage to the new valve stem oil seal - B -.

- Lightly oil the valve stem seal.

- Push the valve stem seal onto the plastic sleeve.

- Carefully press the valve stem oil seal onto the valve guide using the (3365).

- Remove the plastic sleeve again.

- If the valve retainers were removed from the (VAS 5161/18), they must be inserted into (VAS 5161/18) next.





• The large diameter of the valve retainers point upward.

- Insert the valve spring and valve spring plate.

- Install the (VAS 5161/7) onto the cylinder head again.

- Install the (VAS 5161/8) into the guide plate.





- Press down the pressure fork and pull the knurled screw upward - thereby the valve retainers are inserted.

- Release the pressure fork with the knurled screws still pulled.

- Install the camshafts and adjusters, refer to one of the following:

• => [ Right Camshafts and Adjuster ] Right Camshafts and Adjuster.

• => [ Left Camshafts and Adjuster ] Left Camshafts and Adjuster.

• After installing the camshaft, the engine may not be started for approximately 30 minutes. The hydraulic adjusting elements must seat themselves (otherwise the valves will seat themselves on the pistons).

• After working on the valvetrain and lifters, carefully rotate the crankshaft by hand at least 2 full revolutions before starting to be sure that valves do not strike the pistons.
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