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 the valve seat insert rings and if necessary the cylinder head sealing surface can be reworked. If this is not the case then the valve guide should not be replaced.
- Set up the support as follows:
- Insert locating pins for cylinder head bolt holes -A- in holes 2 and 3.
- Insert pin -B- in the appropriate hole (marked according to valve angle).
Outer intake valves: 21.5 -5
Central intake valve: 15 -5
Exhaust valves: 20 -5
- Press out the worn valve guides as follows using drift 3360:
- Valve guides without shoulder from the camshaft side
- Valve guides with shoulder (repair version) from the combustion chamber side
Installing
NOTE:
When the shoulder on guide makes contact, the pressure must not exceed 10 kN (approx. 1.0 t) otherwise shoulder may break off.
- Coat the new valve guides with oil and press with drift 3360 into cold cylinder head from the camshaft side until the shoulder makes contact.
- Ream guides out with hand reamer 3363 using plenty of cutting fluid.
- Rework valve seats. Refer to Valve seats, reworking .
- Replace valve stem seals. Refer to Valve stem seals, replacing .