Valve Guides Inspection & Replacement

Ensure valve stem diameter is within specification and check valve stem clearance. Clearance should be within specification. See ENGINE SPECIFICATIONS tables at end of article.
If clearance exceeds service limits, valve guide can be replaced with an oversized valve guide. See OVERSIZED VALVE GUIDE SPECIFICATIONS table.
CAUTION: Measure valve guide installed height prior to removal as installed height is not available from manufacturer. Intake valve guides are shorter in length than exhaust valve guides.
Remove valve guide. Drive valve guide out toward cylinder block area of cylinder head. Machine cylinder head valve guide bore to specification for oversized valve guide. See OVERSIZED VALVE GUIDE SPECIFICATIONS table.
Using valve guide installer, press new guides into cylinder head from top. Ensure valve guide is installed to original height and proper length valve guide is installed. Intake valve guides are shorter in length than exhaust valve guides.
CAUTION: DO NOT install valve guide with the same diameter as that removed.
Check guide clearance with new valve and ream as necessary and check valve seat contact.

OVERSIZED VALVE GUIDE SPECIFICATIONS⁽¹⁾

Size Mark

Guide Size: In. (mm)

Cylinder Head Bore: In. (mm)

.002 (.05)

.4744-.4751 (12.050-12.068

.010 (.25)

.4823-.4830 (12.250-12.268)

.020 (.50)

.4921-.4928 (12.500-12.518)

⁽¹⁾	Installed valve guide height information not available from manufacturer. Measure valve guide height prior to removal. Install replacement guide to the same dimension.