Audi Workshop Service and Repair Manuals

Special tools and workshop equipment required

• ◆ Hand reamer 3120 and cutting fluid

• ◆ Drift 3121

Removing

• ‒ Clean and check cylinder head. Cylinder heads in which the valve seats can no longer be reworked, or cylinder heads which have already been machined to the minimum dimension, should not have the valve guides replaced.

• ‒ Press out worn valve guides with 3121 as follows:
• ‒ → Valve guides without collar:
  from the camshaft side
• ‒ Valve guides with collar (repair version):
  from the combustion chamber side

Installing

• ‒ Lubricate new valve guides with oil and press in with 3121 from the camshaft side (cylinder head cold) until collar makes contact.

Note:

When the collar on the valve guide makes contact, the pressure must not exceed 10 kN (approx. 1.0 t) otherwise the collar can break off.

• ‒ Ream guides out with hand reamer 3120. Use plenty of cutting fluid.
• ‒ Reworking valve seats .
• ‒ Renewing valve stem seals => Page 15-75.