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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.
Dally 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.
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 tightenmg
torque. Important
parts
must
be tightened with
a torque
wrench
to the
correct
t
ightening
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.
r
Apply the following tightening torque to bolts
having
"7"
on
the
head.
(JIS
strength
classification:
1n
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
M1
2x1.75
M14x1.5
M16x1
.5
Tightening
torque Nm
11
±
01
26 ± 03
50
±
05
90
±
1 0
140
±
15
230
± 20
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34
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