Maintenance & Inspection; General Inspection Rules - Yanmar 3JH3(8)E Operation Manual

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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