Valve Seat Removal
Procedure
1 . Remove carbon and combustion deposits
from the valve seat.
2. Select the proper size puller (determined by
the inside diameter of the valve seat). The
puller jaws must expand into the cylinder block
at the point where the bottom of the valve seat
insert rests on the cylinder block (Figure 9-12).
3. Using the new seat insert as a guide, adjust the
puller depth. Position the puller on the valve
seat and tighten its hex nut. Clamp the cylinder
block to a solid bench. Attach a slide hammer
to the puller. Between blows with the slide
hammer, tighten the hex nut.
PULLER JAWS
VT1056c
FIGURE
9-12.
VALVE
SEAT
REMOVAL
9-7
Valve Seat
Installation
Procedure
1 . After the old seat has been removed, clean out
carbon and metal burrs from the seat insert re-
cess. Use a valve seat insert driver and a ham-
mer to install the insert.
2. Insert the pilot of the driver into the valve guide
hole in the cylinder block. Quickly drive the
valve seat insert in, so that the insert goes
evenly to the bottom
of
the recess in the cylin-
der block. Make certain that the valve seat in-
sert rests solidly on the bottom of the recess all
the way around its circumference (Figure
9-13).
VALVE SEAT
INSERT DRIVER
(USE PROPER
/TOOL}
CHECK
THIS
SURFACE FOR
BURRS BEFORE
INSERTING SEAT
VT1025s
FIGURE 9-13. INSERTING NEW VALVE SEAT
3. Insert a valve seat staker into the cylinder
block valve guide hole. Rotate the staking tool
until
it
drops
to
the
original
stake
marks. Rotate
the staking tool another 60° (1/6 turn). Using a
lead hammer, strike the staking tool a sharp
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