Page 3617 of 4500
Standard overall length:
94.85 to 95.35 mm (3.7342 to 3.7539 in.)
Minimum overall length: 94.60 mm (3.7244 in.)
If the overall length is less than the minimum, replace the valve.
Fig. 333: Checking Surface Of Valve Stem Tip For Wear
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
f. Check the surface of the valve stem tip for wear.
If the valve stem tip is worn, resurface the tip with a grinder or replace the valve.
Page 3618 of 4500
Fig. 334: Measuring Deviation Of Spring Using Steel Squares
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
8.INSPECT INNER COMPRESSION SPRING
a. Using steel squares, measure the deviation of the spring.
Maximum deviation: 2.0 mm (0.079 in.)
If the deviation is
greater than the maximum, replace the spring.
Page 3619 of 4500
Fig. 335: Measuring Free Length Of Spring Using Vernier Caliper
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
b. Using a vernier caliper, measure the free length of the spring.
Free length: 54.05 to 54.15 mm (2.1279 to 2.1319 in.)
If the free len
gth is not as specified, replace the spring.
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Page 3621 of 4500
Fig. 336: Measuring Tension Of Valve Spring Using Spring Tester
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
c. Using a spring tester, measure the tension of the valve spring at the specified installed length.
Standard:
204 to 226 N (20.8 to 23.0 kgf, 45.9 to 50.7 lbf)
at 35.04 mm (1.3795 in.)
If the tension is not as specified, replace the valve spring.
Fig. 337: Measuring Inside Diameter Of Guide Bush Using Caliper Gauge (Intake Valve Guide
Page 3622 of 4500
Bush)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
9.INSPECT INTAKE VALVE GUIDE BUSH
a. Using a caliper gauge, measure the inside diameter of the guide bush.
Bush inside diameter:
5.510 to 5.530 mm (0.2169 to 0.2177 in.)
If the journal diameter is not as specified, check the oil clearance.
b. Subtract the valve stem diameter measurement (see step 6) from the guide bush inside diameter
measurement.
Standard oil clearance:
0.025 to 0.060 mm (0.0010 to 0.0024 in.)
Maximum oil clearance: 0.08 mm (0.0031 in.)
If the clearance is greater than the maximum, replace the valve and guide bush (see steps 11 and 12).
Page 3623 of 4500
Fig. 338: Measuring Inside Diameter Of Guide Bush Using Caliper Gauge (Exhaust Valve Guide
Bush)
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
10.INSPECT EXHAUST VALVE GUIDE BUSH
a. Using a caliper gauge, measure the inside diameter of the guide bush.
Bush inside diameter:
5.510 to 5.530 mm (0.2169 to 0.2177 in.)
If the journal diameter is not as specified, check the oil clearance.
b. Subtract the valve stem diameter measurement (see step 7) from the guide bush inside diameter
measurement.
Page 3624 of 4500
Standard oil clearance:
0.030 to 0.065 mm (0.0012 to 0.0026 in.)
Maximum oil clearance: 0.10 mm (0.0039 in.)
If the clearance is greater than the maximum, replace the valve and guide bush (see steps 12 and 14).
Fig. 339: Heating Cylinder Head
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.
11.REMOVE INTAKE VALVE GUIDE BUSH
a. Gradually heat the cylinder head to approximately 80 to 100°C (176 to 212° F).