Valve Guide Seal: Service and Repair
Valve Stem Seals
Special tools, testers and auxiliary items required
• Spark plug removal tool (3122 B)
• Valve seal removal tool (3364)
• Valve stem seal driver (3365)
• Valve cotter disassembly and assembly device (VAS 5161)
• Adapter (T40012)
Removing
- Remove engine. Refer to --> [ Engine, Removing ] Engine Removing.
- Remove camshaft timing chains from camshafts. Refer to --> [ Camshaft Timing Chains, Removing from Camshafts ] Camshaft Timing Chains, Removing From Camshafts.
- Remove camshaft. Refer to --> [ Camshaft ] Service and Repair.
- Using spark plug removal tool (3122 B), remove spark plugs.
- Place drift (VAS 5161/3) on valve spring plate and loosen stuck valve cotters using a plastic hammer.
- Place guide plate (VAS 5161/19 A) from valve cotter disassembly and assembly device (VAS 5161) on cylinder head.
- Secure guide plate with knurled bolts (VAS 5161/12).
- Install adapter (T40012) with gasket by hand into respective spark plug thread and apply constant pressure.
• Minimum pressure: 6 bar positive pressure.
- Secure engaging device (VAS 5161/6) with installation fork (VAS 5161/5) to guide plate.
- Push installation cartridge (VAS 5161/8) into guide plate.
- Engage pressure fork (VAS 5161/2) at engaging device and press down installation cartridge.
- At the same time, turn knurled bolt of installation cartridge to the right, until the points engage in the valve cotters.
- Lightly move knurled bolt back and forth, causing the valve cotters to be pressed apart and be captured in the installation cartridge.
- Release pressure fork.
- Take out installation cartridge.
- Unfasten guide plate and turn it aside.
• Pressurized air hose remains connected.
- Remove valve spring with valve spring plate.
- Remove valve stem seal with valve seal removal tool (3364).
If the valve seal removal tool (3364) cannot be used on some valve stem seals due to restricted clearance, proceed as follows:
- Using a drift, drive out roll pin - arrow - at puller with a drift and remove the impact puller attachment.
- Place lower part of puller on valve stem seal.
- Secure puller with a drift or cotter pin driver - 1 -, as shown in illustration.
- Place lever on puller and pull off valve stem seal - arrow -.
• A plastic sleeve - A - is supplied with the new valve shaft seals.
- Place plastic sleeve - A - on valve stem to prevent damage to new valve stem seals - B -.
- Lightly coat sealing lips of valve stem seal with oil.
- Push valve stem seal onto plastic sleeve.
- Carefully press valve stem oil seal onto valve guide using (3365).
- Remove plastic sleeve again.
If the valve keepers were removed from the installation cartridge, they must then be inserted into the insertion device (VAS 5161/18).
• The large diameter of the valve cotters point upward.
- Install valve spring and valve spring plate.
• The tight spring coils - arrow - face toward cylinder head.
- Install guide plate onto cylinder head again.
- Insert installation cartridge into guide plate.
- Press down pressure fork and pull knurled bolt upward turning to left and right, valve cotters are inserted in this manner.
- Release pressure fork with the knurled bolt still pulled.
- Ensure that all roller rocker levers seat properly on valve stem ends and are clipped onto respective support elements.
- Install sparks plugs. Refer to --> [ Spark Plug Technical Data ] [1][2]Spark Plug.
- Install camshaft. Refer to --> [ Camshaft ] Service and Repair.
- Position camshaft timing chains on camshafts. Refer to --> [ Installing ] Camshaft Timing Chains, Removing From Camshafts.
- Install left and right timing chain covers. Refer to--> [ Installing ] Left and Right Timing Chain Covers.
- Install cylinder head cover: Left, refer to --> [ Left Cylinder Head Cover ] Left Cylinder Head Cover and right, refer to --> [ Right Cylinder Head Cover ] Right Cylinder Head Cover.
• After installing camshafts, do not crank engine for at least 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.
- Install engine. Refer to --> [ Engine, Installing ] Engine Installing.