Inspecting the valve housings
•
Remove the carbon deposits from the
valve face and seat.
•
Check that the valve seat does not
show cracks or signs of wear; other-
wise, replace the component.
•
Check that the valve seat is within the
indicated values; otherwise, replace
the component.
Titanium valve and valve seats: cannot be ground.
Characteristic
Intake valve seat support width - maximum lim-
it
1.3 mm (0.0512 in)
Exhaust valve seat support width - maximum
limit
1.5 mm (0.059 in)
Inspecting the springs and half-cones
•
Use a gauge to measure the unloaded
valve spring length. If the length meas-
ured is not within the specified values,
replace the valve spring.
Characteristic
Unloaded valve spring length:
intake: 37.8 mm (1.488 in)
exhaust: 35.7 mm (1.406 in)
•
On a contrasting surface, use a square
to measure the valve spring angle (H).
If the length measured is not within the
specified values, replace the valve
spring.
Characteristic
Spring angle maximum limit
2.5°
Engine MXV 450
ENG - 112
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