5-70
E
POWR
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2. Measure:
• Cylinder head warpage
Out of specification → Replace the cyl-
inder head.
Measurement steps:
1. Eliminate carbon deposits from the com-
bustion chambers.
2. Check the cylinder head warpage using a
straightedge 1 and thickness gauge 2 in
the directions shown.
Cylinder head warpage limit:
0.1 mm (0.004 in)
1
2
Valve spring check
1. Measure:
• Valve spring free length a
Out of specification → Replace the
valve spring.
Valve spring free length a:
Intake and exhaust:
45.58 mm (1.794 in)
a
2. Measure:
• Valve spring tilt a
Out of specification → Replace the
valve spring.
Valve spring tilt limit a:
Intake and exhaust:
2.0 mm (0.08 in)
Valve check
NOTE:
To ensure accurate measurements, be sure to
clean the valves before measuring them.
1. Check:
• Valve face
Pitting → Replace the valve.
Cylinder head
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