Valve Contact Width
1. Check the valve contact faces for roughness and
unevenness.
Make smooth the valve contact surfaces.
2. Measure the valve contact width.
If the measured value exceeds the specified limit,
the valve seat insert must be replaced.
Valve Contact Width mm(in)
Standard Limit
Intake 1.7 (0.067) 2.2 (0.087)
Exhaust 2.0 (0.079) 2.5 (0.098)
Valve Depression
1. Install the valve 1 to the cylinder head 2 .
2. Use a depth gauge or a straight edge with steel rule
to measure the valve depression from the cylinder
head lower surface.
If the measured value exceeds the specified limit,
the valve seat insert must be replaced.
Valve Depression mm(in)
Standard Limit
Intake 0.73 (0.029) 1.28 (0.050)
Exhaust 0.70 (0.028) 1.20 (0.047)
ENGINE ASSEMBLY ( 2 )
51
Valve Seat Insert Replacement
Valve Seat Insert Removal
1. Arc weld the entire inside circumference 1 of the
valve seat insert 2.
2. Allow the valve seat insert to cool for a few minutes.
This will invite contraction and make removal of the
valve seat insert easier.
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