Valve Guide: Service and Repair

Valve guides, replacing
Special tools and equipment





^ Press tool VW411
^ Drift 3360
^ Support 3361
^ Hand reamer 3363 and cutting fluid

Removing
- 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.





First set the support as follows:
- Install mount pins for cylinder head bolt holes -A- into threaded hole positions 2 and 3.
- Install pin -B- into relevant hole for valve angle.
^ Outer intake valves: 21.5°
^ Center intake valve: 15°
^ Exhaust valve: 20°





- Press worn valve guides out with drift 3360 from camshaft side.

Installing

Note: When the shoulder on guide makes contact, the pressure must not exceed 10 kN (approximately 1.0 ohms) otherwise 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.