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DISASSEMBLY
10. INSPECT CAM LOBES
Using a micrometer, measure the cam lobe height.
Standard cam lobe height
Minimum cam lobe height
If the cam lobe height is less than minimum, replace the camshaft.
11. INSPECT CAMSHAFT JOURNALS
Using a micrometer, measure the journal diameter.
Journal diameter: 28.949 - 28.965 mm (1.1397 - 1.1404 inch)
If the journal diameter is not as specified, check the oil clearance.
12. INSPECT CAMSHAFT BEARING
Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and cylinder head as a set.
13. INSPECT CAMSHAFT JOURNAL OIL CLEARANCE
a. Clean the bearing caps and camshaft journals.
b. Place the camshafts on the cylinder head.
c. Lay a strip of Plastigage across each of the camshaft journals.
d. Install the bearing caps.
Torque: 20 Nm (200 kgf-cm, 14 ft. lbs.)
NOTICE: Do not turn the camshaft.
e. Remove the bearing caps.
f. Measure the Plastigage at its widest point.
Standard oil clearance: 0.035 - 0.072 mm (0.0014 - 0.0028 inch)
Maximum oil clearance: 0.10 mm (0.0039 inch)
If the oil clearance is greater than maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.
g. Completely remove the Plastigage.
14. INSPECT CAMSHAFT THRUST CLEARANCE
a. Install the camshafts.
b. Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.
Standard thrust clearance: 0.080 - 0.190 mm (0.0031 - 0.0075 inch)
Maximum thrust clearance: 0.30 mm (0.0118 inch)
If the thrust clearance is greater than maximum, replace the camshaft. If necessary, replace the bearing caps and cylinder head as a set.
15. INSPECT VALVE LIFTERS AND LIFTER BORES
a. Using a caliper gauge, measure the lifter bore diameter of the cylinder head.
Lifter bore diameter: 31.000 - 31.016 mm (1.2205 - 1.2211 inch)
b. Using a micrometer, measure the lifter diameter.
Lifter diameter: 30.966 - 30.976 mm (1.2191 - 1.2195 inch)
c. Subtract the lifter diameter measurement from the lifter bore diameter measurement.
Standard oil clearance: 0.024 - 0.050 mm (0.0009 - 0.0020 inch)
Maximum oil clearance: 0.07 mm (0.0028 inch)
If the oil clearance is greater than maximum, replace the lifter.
If necessary, replace the cylinder head.
16. INSPECT AIR INTAKE CHAMBER
Using a precision straight edge and feeler gauge, measure the surfaces contacting the intake manifold for warpage.
Maximum warpage: 0.15 mm (0.0059 inch)
If warpage is greater than maximum, replace the chamber.
17. INSPECT INTAKE MANIFOLD
Using a precision straight edge and feeler gauge, measure the surfaces contacting the cylinder head and air intake chamber for warpage.
Maximum warpage: 0.15 mm (0.0059 inch)
If warpage is greater than maximum, replace the manifold.
18. INSPECT EXHAUST MANIFOLD
Using a precision straight edge and feeler gauge, measure the surfaces contacting the cylinder head for warpage.
Maximum warpage: 0.50 mm (0.0196 inch)
If warpage is greater than maximum, replace the manifold.
19. INSPECT CYLINDER HEAD BOLTS
Using a vernier caliper, measure the thread outside diameter of the bolt.
Standard outside diameter: 10.8 - 11.0 mm (0.425 - 0.433 inch)
Minimum outside diameter: 10.7 mm (0.421 inch)
If the diameter is less than minimum, replace the bolt.
REPLACEMENT
REPLACE VALVE GUIDE BUSHINGS
a. Using SST and a hammer, tap out the guide bushing.
SST 09201-10000 (09201-01060), 09950-70010 (09951-07100)
b. Using a caliper gauge, measure the bushing bore diameter of the cylinder head.
c. Select a new guide bushing (STD or O/S 0.05).
If the bushing bore diameter of the cylinder head is greater than 11.006 mm (0.4333 inch), machine the bushing bore to the following dimension: 11.035 - 11.056 mm (0.4344 - 0.4353 inch)
If the bushing bore diameter of the cylinder head is greater than 11.056 mm (0.4353 inch), replace the cylinder head.
d. Using SST and a hammer, tap in a new guide bushing to the specified protrusion height.
SST 09201-10000 (09201-01060), 09950-70010 (09951-07100)
Protrusion height
HINT: Different bushings are used for the intake and exhaust.
e. Using a sharp 6 mm reamer, ream the guide bushing to obtain the standard specified clearance between the guide bushing and valve stem.