ENGINE ASSEMBLY II 4-5
3. Use a screwdriver @ to pry the valve seat insert
free.
Take care
not to damage the cylinder head @.
5l
4. Carefully remove carbon and other foreign material
from the cylinder head insert bore.
Valve Seat Installation
1. Carefully place the attachment @ (having the
smaller outside diameter than the valve seat insert)
on the valve seat insert 0.
Note:
The
smooth side of the attachment must contact the
valve seat
insert.
2. Use a bench press @ to slowly apply pressure to the
attachment and press the valve seat insert into
place. (Amount of pressure needed is more than
2,500 kg)
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 deposits from the valve seat
insert surface.
2. Use valve
cutters (15”,
30°, or 75’ blades) to remove
scratches and other rough areas.
This will bring
the contact width
back
to the stan-
dard value of 90’ @.
Remove only the scratches and rough areas. Do not
cut away too much.
Take care not to cut away
unblemished areas of the valve seat surfaces.
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