Valve Guide: Service and Repair
REPLACEMENT1. REPLACE VALVE GUIDE BUSHINGS
a. Gradually heat the cylinder head to 80 - 100°C (176 - 212°F).
b. Using SST and a hammer, tap out the guide bushing.
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c. Using a caliper gauge, measure the bushing bore diameter of the cylinder head.
d. Select a new guide bushing (STD or O/S 0.05).
If the bushing bore diameter of the cylinder head is greater than 10.313 mm (0.4060 inch), machine the bushing bore to the following dimension: 10.345 - 10.363 mm (0.4073 - 0.4080 inch)
If the bushing bore diameter of the cylinder head is greater than 10.363 mm (0.4080 inch), replace the cylinder head.
Both intake and exhaust
HINT: Different bushings are used for the intake and exhaust.
e. Gradually heat the cylinder head to 80 - 100°C (176 - 212°F).
f. Using SST and a hammer, tap in a new guide bushing to the specified protrusion height.
SST 09201-01055, 09950-70010 (09951-07100)
Protrusion height
g. Using a sharp 5.5 mm reamer, ream the guide bushing to obtain the standard specified clearance between the guide bushing and valve stem.
2. REPLACE SPARK PLUG TUBE GASKETS
a. Bend up the tab on the ventilation baffle plate which prevents the gasket from the slipping out.
b. Using a screwdriver and hammer, tap out the gasket.
c. Using needle-nose pliers, pry out the gasket.
d. Using SST and a hammer, tap in a new gasket until its surface is flush with the upper edge of the cylinder head cover.
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e. Apply a light coat of MP grease to the gasket lip.
f. Return the ventilation plate tab to its original position.