4. Maintenance & Inspection
4.1
General
Inspection
Rules
Conduct
Periodic
Inspection
for
Your
Safety.
The functions of engine components will
degenerate and engine performance will
drop according to the use
of
the engine. If
countermeasures are not taken, you may
encounter unexpected troubles while
cruising at sea. Consumption of fuel or
lube oil may become excessive and
exhaust gas and engine noise may
increase. These
all shorten the life of the
engine. Daily and periodic inspection and
servicing increase your safety at sea.
Inspect
Before
Starting.
Make it a daily rule
to
inspect before
starting. (See 3.3.1)
Periodic
Inspections
at
Fixed Intervals.
Periodic inspections must be made after
every
50, 150, 300 and 600 hours of use.
Conduct periodic inspections according
to
the procedures described
in
this Operation
Manual.
Use Genuine Parts.
Be sure
to
use genuine parts for consum-
able and replacement parts. Use
of
other
parts
will reduce engine performance and
shorten the life of the engine.
NOTICE
Consult
Your
YANMAR
Dealer
or
Distributor.
Specialized technicians are ready
to
assist
you with periodic inspections and mainte-
nance. Consult your YANMAR dealer or
distributor
in
accordance with the service
agreement.
Servicing
Tools
Prepare servicing tools onboard
to
be
ready for inspecting and serviCing the
engine and other equipment.
Tightening
Torque
of
Bolts
&
Nuts
Over-tightening of bolts and nuts causes
them
to
come off or their threads to be
damaged.
Insufficient tightening causes oil
leakage from the
installation face or
troubles due
to
the loosening
of
bolts.
Bolts and nuts must be tightened
to
the
appropriate tightening torque.
Important
parts must be tightened with a torque
wrench to the correct tightening torque
and
in
the right order. Consult with your
dealer or distributor if the servicing
requires the removal
of
such parts.
The standard tightening torque for
standard bolts
& nuts is listed below.
Apply
the
following
tightening
torque
to
bolts
having "7"
on
the
head. (JIS
strength
classification:
7n
Tighten
bolts
with
no
"7"
mark
to
60%
tightening
torque.
If
the
parts
to
be
tightened
are
made
from
light
alloy
aluminum,
tighten
the
bolts
to
80%
tightening
torque.
Bolt dia. x pitch mm
M6x1.0 M8x1.25 M10x1.5
M12x1.75
M14x1.5 M16x1.5
Tightening torque Nm
11
±
01
26±
03
50±
05 90 ± 10 140 ± 15 230 ± 20
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