Valve guides, replacing

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Special tools and equipment

Fig 1: Identifying 3121 Drift

Courtesy of VOLKSWAGEN UNITED STATES, INC.

3121 Drift

Fig 2: Identifying 3120 Reamer And Cutting Fluid

Courtesy of VOLKSWAGEN UNITED STATES, INC.

3120 Reamer and cutting fluid

Removing

Clean and check cylinder head.

NOTE: Cylinder heads in which the valve seats can no longer be reworked (note minimum dimension. Refer to Valve seats, reworking ), or cylinder heads which have already been machined to the minimum dimension (Refer to Figure , Fig.1), should not have the valve guides replaced.

Press out worn valve guides with drift 3121 from camshaft side (repair versions with shoulder, from combustion chamber side).

Installing

Press in new guides, moistened with oil, from camshaft side onto shoulder in cold cylinder head using drift 3121.

NOTE: When the shoulder on guide makes contact the pressure must not exceed 10 kN (approx. 1.0 t) or the shoulder may break off.

Ream valve guide using hand reamer 3120. Always use cutting fluid when reaming.
Rework valve seats. Refer to Valve seats, reworking .