Valve Guide: Service and Repair

Valve guides, replacing

Special tools, testers, measuring instruments and auxiliary items required

^ Drift 3360
^ Support 3361
^ Hand reamer 3363 and cutting fluid
^ Press tool VW 411

Removing

- First check whether valve seat insert rings and, if necessary, cylinder head sealing surface can be reworked. If not, then valve guide should not be replaced.





Set up the support as follows:
- Insert locating pins for cylinder head bolt drillings -A- in holes 2 and 3.
- Insert pin -B- in appropriate hole (marked according to valve angle).

^ Outer intake valves: 21.5 ° angle
^ Central intake valve: 15 ° angle
^ Exhaust valves: 20 ° angle





- Press out worn valve guides as follows using drift 3360:

^ Valve guides without shoulder from camshaft side
^ Valve guides with shoulder (repair version) from combustion chamber side

Installing

Note:
When the shoulder on guide makes contact, the pressure must not exceed 10 M (approx. 1. 0 t), otherwise the shoulder may break off.

- Coat new valve guides with oil and press with drift 3360 into cold cylinder head from camshaft side until shoulder makes contact.
- Ream guides out with hand reamer 3363 using plenty of cutting fluid.
- Rework valve seats.
- Replace valve stem seals.