Valve Guides — Audi 90 B4 (1992-1995)

Valve Guides Audi 90 B4

To measure valve guide wear, attach dial indicator to cylinder head. Insert new valve into guide until valve stem tip is even with top end of guide. Lightly push edge of valve head against dial indicator tip. Zero dial indicator. Push valve away from dial indicator, in direction opposite of camshaft axis. Maximum allowable deflection is: Intake - .04" (1.0 mm) Exhaust - .05" (1.3 mm).
If deflection does not exceed specification, guide is okay. If deflection exceeds specification, remove guide. To remove guide, press guide out through top of cylinder head using Adaptor (10-206). To install guide, coat guide with oil. Press into bore through top of cold cylinder head using Adaptor (10-206). Press guide until shoulder contacts cylinder head. Ream guide using Reamer (3120) and liberal quantity of cutting fluid. Machine valve seats.

Valve Guides Audi 90 B4