VALVE GUIDE REPLACEMENT
When valve guide is removed, replace with oversized [0.2 mm (0.008 in)] valve guide.
Scheme 286
Scheme 287
Scheme 288
Scheme 289
Scheme 290
- To remove valve guide, heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil.
- Drive out valve guide with a press [under a 20 kN (2 ton, 2.2 US ton, 2.0 Imp ton) pressure] or hammer and suitable tool. CAUTION: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
- Using valve guide reamer (commercial service tool), ream cylinder head valve guide hole. Valve guide hole diameter (for service parts): Intake and exhaust: 10.175 - 10.196 mm (0.4006 - 0.4014 in)
- Heat cylinder head to 110 to 130°C (230 to 266°F) by soaking in heated oil.
- Using valve guide drift (commercial service tool), press valve guide from camshaft side to the dimensions as in (Scheme 290). Projection "L". Intake and exhaust: 12.6 - 12.8 mm (0.496 - 0.504 in) CAUTION: Cylinder head contains heat. When working, wear protective equipment to avoid getting burned.
- Using valve guide reamer (commercial service tool), apply reamer finish to valve guide. Standard: Intake and exhaust: 6.000 - 6.018 mm (0.2362 - 0.2369 in)
Scheme 291
Scheme 292
- After confirming that the dimensions of valve guides and valves are within the specifications, perform this procedure.
- Apply prussian blue (or white lead) onto contacting surface of valve seat to check the condition of the valve contact on the surface.
- Check if the contact area band is continuous all around the circumference.
- If not, grind to adjust valve fitting and check again. If the contacting surface still has "NG" conditions even after the re-check, replace valve seat, Refer to " «VALVE SEAT REPLACEMENT»(ref-170482-S20129329662005011000000) ".