Valve Guides, Replacing
Special tools and workshop equipment required
- Valve Guide Drift 3121
- Valve Guide Reamer - 7mm 3120
- Cutting oil
Removing
-- Cleaning and checking cylinder head.
Do not re-work the cylinder heads any more:
- If the valve seat rings cannot be re-worked any more. Pay attention to the minimum dimensions, refer to VALVE SEATS, REWORKING .
- If the sealing surface was worked to the minimum dimension -a-.
Reworking dimension, cylinder head:
- -a- : minimum 132.6 mm
If the sealing surface is reworked, then place the valves deeper. The valve seat rings must be re-worked. Otherwise the valve will hit up against the pistons.
Be careful not to exceed the minimum dimension, refer to VALVE SEATS, REWORKING .
-- Remove any worn valve guides from the camshaft side using a Valve Guide Drift 3121.
Remove worn valve guides from the combustion side with the shouldered repair guide.
Installing
-- Replace the valve guides and coat them with oil.
-- Press the guides from the camshaft side up to the collar in the cold cylinder head using the Valve Guide Drift 3121.
After the guide with the shoulder is seated, the pressing force may not be increased over 1.0 t). Otherwise the collar could break off.
-- Ream the valve guide using the Valve Guide Reamer - 7mm 3120.
- Always use cutting oil for this.
-- Rework the valve seats, refer to VALVE SEATS, REWORKING .