Arctic Cat 700 Diesel ATV 2007 Service Manual page 56

6. Clean valve faces, valve seats, and valve stems.
DO NOT use a wire brush on valve stems.
7. Using a suitable calipers or outside micrometer,
measure the valve stem. If valve stem measures
less than minimum specifications, the valve must
be replaced.
8. Measure the valve guide inside diameter using a
suitable micrometer or bore gauge. If measure-
ment is greater than specified, the valve guide
must be replaced.
9. Check the valve seats for evidence of discolora-
tion, cracks, or loose fit in cylinder head as well as
clean, even contact area. Replace any valve seats
that show evidence of excessive wear or damage.
10. Check the cylinder head for cracks, loose rocker
arm studs, or loose injector hold-down studs. If
cylinder head is cracked, it must be replaced.
Servicing Valves/Valve
Guides/Valve Seats
If valves, valve guides, or valve seats require servicing
or replacement, Arctic Cat recommends that the com-
ponents be taken to a qualified machine shop for ser-
vicing.
! CAUTION
If valves are discolored or pitted or if the seating sur-
face is worn, the valve must be replaced. Do not
attempt to grind the valves or severe engine damage
may occur.
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DE318A
DE319
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Assembling Valves
1. Thoroughly clean all valve components in
parts-cleaning solvent; then dry with compressed
air.
! WARNING
Always wear safety glasses when working with com-
pressed air.
2. Place new valve seals in clean engine oil and soak
for five minutes; then using a suitable installation
tool, install the seals on the valve guides.
! CAUTION
Do not use a hammer to drive seals in place. Use
only hand pressure or seal damage will occur.
3. Apply clean engine oil to valve stems and valve
guides; then install the valves into the same port
they were removed from.
4. Place spring seat, valve spring, and spring cap into
position; then using a suitable valve spring com-
pressor, compress the spring and install the valve
keepers onto the valve stem.
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