Valve guides, replacing

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Special tools, testers and auxiliary items required

Fig 1: Identifying 3121 Drift

GW00000118

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Drift 3121

Fig 2: Identifying 3120 Reamer And Cutting Fluid

GW00000119

Courtesy of VOLKSWAGEN UNITED STATES, INC.

Reamer 7 mm 3120 and cutting oil

Removing

Clean and check cylinder head.

NOTE:

Do not replace the valve guides in cylinder heads where the valve seats can no longer be reworked, or cylinder heads which have already been machined to the minimum dimension.

Press worn valve guides out using drift 3121 from the camshaft side (valve guide with shoulder service version - from combustion chamber side).

Installing

Press new guides in up to shoulder (lubricated with oil) from camshaft side in cold cylinder head using drift 3121.

NOTE:

After the valve guide with the shoulder is seated, the pressing force may not be increased over 1.0 t, otherwise the shoulder could break off.

Hone valve guide using hand reamer. Always use cutting oil for this.
Rework valve seats. Refer to Valve seats, reworking .