REMOVAL & INSTALLATION
- Gradually heat the cylinder head in water to 176-212°F (80-100°C), before beginning the replacement procedure.
- On 2S-E engines, use a brass rod and hammer to break the valve guide off above its snapring. On the 3S-GE, 3S-GTE and 5S-FE engines, on which some valve bushings use a snapring, use an old valve and break off the bottom top half of the bushing. On other engines, just tap out the bushing. Be careful not to damage the valve bore.
- Allow the head to cool. Using SST No. 09201-60011, 09201-70010, or equivalent, tap out the guide bushing from the bore.
- Using a caliper gauge, measure the bushing bore diameter of the cylinder head. If it is within the lower limit of specifications, the guide can be replaced with a standard size guide. If the bore diameter is within the upper limit of specifications, the guide bore can be machined for an oversize guide. If the guide bore diameter exceeds the upper limit, the cylinder head must be replaced.
- Select the proper size replacement bushing and machine the bore, if necessary.
- Gradually heat the cylinder head again to 176-212°F (80-100°C).
- Using a drift and a hammer, tap in a new guide bushing. On the 2S-E, 3S-GE and 3S-GTE engines and on the exhaust valve on the 5S-FE engine, drive the bushing into the bore until the snapring makes contact with the cylinder head. On the intake valve on the 5S-FE engine, tap in a new guide bushing until there is 0.315-0.346 (8.0-8.8mm) protruding from the head. On 3S-FE engines, tap in the bushing until 0.300-0.309 (8.2-8.6mm) extends above the head.
- With a sharp 6mm or 8mm reamer, depending on application, ream the valve guide bushing until the proper clearance between the new bushing and valve stem is obtained. See "Valves, Inspection" and the Valve Specifications chart in this section for procedure and specifications.