Reassembly - Isuzu 2000 Trooper Workshop Manual

7. Check that the valve seat insert surface is in contact
with the entire circumference of the valve.
Valve Seat Insert Replacement
1. Arc weld the rod at several points. Be careful not to
damage the aluminum section.
2. Allow the rod to cool for a few minutes. This will cause
the valve seat to shrink.
3. Strike the rod and pull it out.
4. Carefully clean the valve seat press–fit section on the
cylinder head side.
5. Heat the press–fit section with steam or some other
means to cause expansion. Cool the valve seat with
dry ice or some other means.
6. Insert the press–fit section into the valve seat
horizontally.
Standard fitting interference: 0.14 mm–0.09 mm
(0.0055 in–0.0035 in)
7. After insertion, use a seat grinder to grind finish the
seating face. Carefully note the seating angle, the
contact width, and the depression.
8. Lap the valve and the seat.

Reassembly

1. Install valve guide (1) to cylinder head. Apply engine
oil to the outside of the valve guide. Using valve guide
replacer J–42899, drive in a new valve guide from the
camshaft side.
2. Install oil controller (3) and spring lower seat (2).
Using oil controller replacer J–37281, drive in a new
oil controller.
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3. Install valve to valve guide. Before install valve guide
apply engine oil to the outside of the valve stem.
4. Install valve spring to cylinder head. Attach the valve
spring to the lower spring seat. The painted area of
the valve spring should be facing downward.
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ENGINE MECHANICAL 6A–57
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