GENERAL ENGINE MECHANICAL 6A – 15
NOTE:
Do not apply an excessive amount of pressure with
the bench press. Damage to the valve seat insert will
result.
Valve Seat Insert Correction
1. Remove the carbon from the valve seat insert surface.
2. Use a valve cutter (15°, 45°, and 75° blades) to
minimize scratches and other rough areas, this will
bring the contact width back to the standard value.
Remove only the scratches and rough areas. Do not
cut away too much. Take care not to cut away
unblemished area of the valve seat surface.
Valve Seat Angle degree
45°
NOTE:
Use an adjustable valve cutter pilot.
Do not allow the valve cutter pilot to wobble inside the
valve guide.
3. Apply abrasive compound to the valve seat insert
surface.
4. Insert the valve into the valve guide.
5. Turn the valve while tapping it to fit the valve seat
insert.
6. Check that the valve contract width is correct.
7. Check that the valve seat insert surface is in contact
with the entire circumference of the valve.
Push Rod Curvature
1. Lay the push rod on a surface plate.
2. Roll the push rod along the surface plate and measure
the push rod curvature with a thickness gauge.
If the measure value exceeds the specified limit, the
push rod must be replaced.
Push Rod Curvature Limit mm (in)
0.4 (0.0157) or less
3. Visually inspect both ends of the push rod for
excessive wear and damage. The push rod must be
replaced if these conditions are discovered during
inspection.
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