Workshop Manual

6A–57
ENGINE MECHANICAL (6VE1 3.5L)
3.Apply abrasive compound to the valve seat insert
surface.
4.Insert the valve into the valve guide.
5.Turn the valve while lapping it to fit the valve seat
insert.
6.Check that the valve contact width is correct.
7.Check that the valve seat insert surface is in contact
with the entire circumference of the valve.
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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.
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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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