Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ Puller 3047 A
• ◆ Fitting tool 3129
• ◆ Flexible-head spanner 3220
• ◆ Disassembly and assembly tool VAS 5161

Removing

• ● Cylinder head installed

Note:

When cylinder head was removed the valve stem seals can be replaced when using special tool 2037.

• ‒ Removing camshaft => page 15-100.
• ‒ Remove camshaft bearing shells from cylinder head.

Notes:

• ◆ Make sure that the camshaft bearing shells are not interchanged.
• ◆ Mark allocation of camshaft bearing shells on rear with a waterproof felt-tip pen.
• ◆ Make sure that the bucket tappets are not interchanged.
• ◆ Mark allocation of bucket tappets on rear with a waterproof felt-tip pen.

• ‒ Remove the bucket tappets from guides and put them down with the contact surface downwards.

• ‒ → Install pin VAS 5161/3 into bucket tappet guide.
• ‒ Knock valve wedges of all valves loose using a plastic hammer.
• ‒ Unplug connector console from glow plugs.
• ‒ Remove all glow plugs using flexible-head spanner 3220.

• ‒ → Screw in adapter VAS 5161/11 into the relevant glow plug thread hand tight.
• ‒ Screw in catch part VAS 5161/6 with attachment fork (M6) VAS 5161/5 into a thread bore on cylinder head.
• ‒ Push guide bush VAS 5161/16 into bucket tappet guide of the valve to be removed until limit stop.
• ‒ Installation position of guide bush: Hatched areas face driving direction

• ‒ Push assembly cartridge VAS 5161/15 into guide bush.
• ‒ Connect adapter VAS 5161/11 via a commercially available intermediate piece to the pressure connection.
• ‒ Minimum pressure: 6 bar
• ‒ Attach pressure fork VAS 5161/2 to catch part VAS 5161/6 and push assembly cartridge down.
• ‒ At the same time turn knurled screw of assembly cartridge towards the right until the tips of the valve wedges engage.
• ‒ Slightly move the knurled screw back and forth. This causes the valve wedges to be pressed apart and taken into the cartridge.
• ‒ Release the pressure fork.
• ‒ Remove assembly cartridge, guide bush, valve plate and valve springs.

• ‒ → Use 3047 A to remove valve stem seals.

Installing

Note:

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

• ‒ → To prevent damage to the new valve stem seals -B-, place plastic sleeve -A- on valve stem.
• ‒ Lightly lubricate sealing lip of valve stem seal.
• ‒ Push valve stem seal onto plastic sleeve.

• ‒ Carefully press the valve stem seal onto valve guide using press tool 3129.
• ‒ Remove plastic sleeve again.

• ‒ → If the valve wedges were taken out of the assembly cartridge they must first be inserted into the installing tool VAS 5161/18.

Note:

The large diameter of the valve wedges points upwards.

• ‒ Push assembly cartridge VAS 5161/15 from the top onto installing tool and take up the valve wedges.

• ‒ → Reinstall the assembly cartridge VAS 5161/15 into guide bush VAS 5161/16.
• ‒ Push pressure fork down and pull knurled screw upwards by turning to left and right - thus the valve wedges are installed.
• ‒ Take load of the pressure fork when knurled screw is still tight.

• ‒ Insert bucket tappet.
• ‒ Installing camshaft =>Page 15-104.

Notes:

• ◆ After installing the camshaft, wait for about 30 minutes before starting the engine. Hydraulic valve compensation elements have to settle (otherwise valves will strike pistons).
• ◆ After working on the valve gear, turn the engine carefully at least 2 rotations to ensure that none of the valves make contact when the starter is operated.

Tightening torque