4. Maintenance & Inspection
a) Impeller blades are cracked
or
nicked.
Edges
or
surfaces
of
the blades are marred
or
scratched.
Note: The
impeller must be replaced
periodically
(every 1000 hrs.).
b) Wear plate
is
damaged.
4. If no damage is found when inspecting
the inside
of
the pump, reassemble the
side cover.
Fit the
O-ring
to
the groove
of
the joint
face before
replacing the side cover.
If a large amount
of
water leaks
continuously
from the water drain pipe
beneath the seawater pump during
operation,
disassembly and mainte-
nance
(replacement
of
the oil
seal)
are
necessary.
When
disassembly and maintenance
of
the seawater pump are necessary, con-
sult your Yanmar dealer or distributor.
The
seawater
pump
turns
in
the
counterclockwise
direction,
but
the
impeller
must
be
installed
by
turning
in
the
clockwise
direction.
If
the
impeller
has
been
removed
for
any
reason and
must
be
reassembled, be very careful
not
to
make
a
mistake
and
turn
it
in
the
wrong
direction.
Additionally,
if
the
engine
is being
turned
manually, be careful
to
turn
it
in
the
correct
direction.
Incorrect
turning
will
twist
the
impeller
and
damage
it.
(3)
Inspection and
Adjustment
of
Intakel
Exhaust Valve Clearance.
When operating for long periods
of
time,
the clearance between the intake/exhaust
valve and the rocker arm will change and
affect operation performance. Adjustment
is necessary.
Adjustment requires
specialized know-
ledge and techniques. Consult your Yan-
mar
dealer or distributor.
(4)
Inspecting
and
Adjusting
the
Fuel
Injection
Spray
Condition.
Adjustment is necessary to obtain the
optimal fuel injection
to
ensure the best
possible engine performance. This inspec-
tion requires
specialized knowledge and
techniques.
Consult your Yanmar dealer or
distributor.
(5)
Adjusting
the
Remote
Control
Cable
(See 4.3.2(3))
(6)
Inspecting and
Adjusting
the
Fuel
Injection
Timing
Fuel injection timing must be adjusted
to
ensure optimal engine performance.
This maintenance requires
specialized
knowledge.
Consult
your Yanmar dealer or distributor.
39
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