Valve Guide Seal: Service and Repair
Valve stem seals, replacing
^ Cylinder head installed
Removing
- Remove camshafts.
- Remove valve lifters and place them down with contact surface facing downward. When doing this ensure that lifters are not interchanged.
- Remove spark plugs with spark plug spanner 3122B.
- Set piston of appropriate cylinder to bottom dead center (BDC).
- Screw pressure hose VW 653/3 into spark plug thread.
The intake and exhaust valves are fitted at different angles in the cylinder head. Valve spring compressor 3362 can be set accordingly to two different positions:
1 - Upper position for center intake valve
2 - Lower position for the two outer intake valves and the two exhaust valves
3 - Threaded holes on each side to take two M6 x 25 bolts for securing spring compressor to cylinder head
- Mount fitting tool 3362 on cylinder head with fitting tool securing bolts.
Note:
To install assembly tool 2036 on the exhaust side the studs at the back of the exhaust side have to be unscrewed.
- Set correct position for valve concerned.
- Connect pressure hose to compressed air supply.
Air pressure: at least 6 bar
- Press valve springs down with threaded spindle and thrust piece 3362/1 and remove.
Note:
Tight keepers can be loosened by tapping lightly on the valve spring plate.
- Pull off valve stem seals with extractor 3364.
Installing
- To prevent damage to new valve stem seals, place plastic sleeve -A- on valve stem.
- Lightly oil sealing lip of valve stem seal.
- Place valve stem seal -B- in the tool 3365 and push carefully onto valve guide.
Note:
When replacing intake and exhaust valves, lightly oil valve stems before installing.
- Install camshafts.
Note:
^ After installing new lifters wait for approx. 30 minutes before starting 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.