Valve Guides

Measure valve stem diameter. Replace valve if stem diameter is not within specification. Measure valve stem oil clearance. Refer to appropriate table: VALVES & VALVE SPRINGS table and/or CYLINDER HEAD table.
If the clearance exceeds the service limit, the valve guide can be replaced with an oversized valve guide. Refer to OVERSIZED VALVE GUIDE SPECIFICATIONS table.
Use commercial valve guide remover to remove valve guide. On all models, drive valve guide out toward combustion chamber side of cylinder head.
Note intake valve guides are shorter than exhaust valve guides. Using valve guide installer, press new valve guide into cylinder head from top. Install valve guide to proper height. Measure guide clearance of new valve guides. Ream valve guide as necessary. Reface valves and seats. See OVERSIZED VALVE GUIDE SPECIFICATIONS table. See CYLINDER HEAD table under ENGINE SPECIFICATIONS.

OVERSIZED VALVE GUIDE SPECIFICATIONS ⁽¹⁾

Size Mark

Guide Size In. (mm)

Cylinder Head Bore In. (mm)

.002 (.05)

.4744-.4751 (12.050-12.070)

.010 (.25)

.4823-.4830 (12.250-12.270)

.020 (.50)

.4921-.4928 (12.500-12.520)

⁽¹⁾	For installed valve guide height, see CYLINDER HEAD under ENGINE SPECIFICATIONS.