Write down the position of each valve lifter “1”
and valve pad “2” so that they can be installed
in their original positions.
2. Remove the intake valves and exhaust
valves.
Write down the position of each valve, spring,
and other parts so that they can be installed in
their original positions.
3. Remove the valve seals.
Cylinder head check
1. Remove carbon deposits from the com-
bustion chambers.
2. Check the cylinder head water jacket.
Clean if there are mineral deposits or rust.
3. Check the cylinder head warpage using a
straightedge “1” and thickness gauge “2” in
the directions shown. Replace if out of
specification.
Valve spring check
1. Measure the valve spring free length “a”.
Replace if out of specification.
Valve spring compressor “1”
90890-04019
Valve spring compressor “1”
YM-04019
Valve spring compressor attachment “2”
90890-04114
Compressor adapter “2”
YM-04114
Warpage limit
0.100 mm (0.0039 in)
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