D439E Service Manual 2. Engine Mechanical System (D439E)
59
11. Check the contacting state of valve seat and
valve.
a. Apply light blue coating on the valve surface.
b. Check the valve contacting state by pressing
the valve to the valve seat.
CAUTION
Be careful that valve does not turn, when valve
seat is pressed by valve.
c. Measure the seat contact area (A).
Area of the valve seat contact
- Intake
Reference : 2.8 ± 0.2 mm
Limit : 3.6 mm
- Exhaust
Reference : 2.0 ± 0.2 mm
Limit : 2.8 mm
Replacement
Replacement of Rocker Bush
1. Remove the bush from rocker using the special
tool (09222-45000).
2. Press fit the bush into rocker using the special
tool (09222-45000).
NOTE : When pressing fit bush into rocker, let the
chamber side of the rocker be inserted first.
CAUTION
When pressing fit, align the bush oil hole with
rocker oil hole.
Repalcement of valve guide
Remove the valve guide using the special tool
(09221-41100). Install the valve guide using the
special tool (09221-41150, 09221-41100).
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