Yanmar 6LYA-STP Mode D'emploi page 36

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 fall if
periodic inspections are not performed. If the countermeasures of the problems are not
taken, you may encounter unexpected troubles while cruising at sea. If the periodic
inspections are not performed, 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.
your safety operation.
Inspect before Starting:
Make it a daily rule to inspect before starting.
Periodic Inspections at Fixed Intervals:
Periodic inspections must be made after 50, 250 (or 1 yr.), 500 (or 2 yrs.), 1000 (or 4 yrs.) and
2000 hours of use. Monitor the hourmeter and conduct periodic inspections according to the
procedures described in this operation Manual.
Use Genuine Parts:
Be sure to use genuine parts for consumable and replacement parts.
Use of other parts will reduce engine performance and shorten the life of the engine.
Servicing Tools:
Prepare servicing tools onboard to be ready for inspecting and servicing the engine and other
equipment.
Tightening Torque of Nuts & Bolts:
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.
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 tightening torque for standard nuts & bolts is listed below:
[ NOTICE ]
● Apply the following tightening torque to bolts having " 7 " on the head.
(JIS strength classification : 7T)
○ Tighten bolts with no " 7 " mark to 60% tightening torque.
○ If the parts to be tightened are made from aluminum alloy, tighten the bolts to 80%
tightening torque.
Bolt dia.×pitch
N . m
Tightening torque
(Kgf-m)
Nuts and Bolts must be tightened to the appropriate tightening torque.
mm M6×1.0 M8×1.25 M10×1.5 M12×1.75 M14×1.5 M16×1.5
10.8±1.0 25.5±2.9
(2.6
(1.1±0.1)
Daily and periodic inspection and servicing increase
88.3
49.0±4.9
0.3) (5.0 0.5) (9.0
± ±
_ _
33
± 9.8 137 ± 9.8
1.0) (14.0 1.0) (23.0
± ±
7
226 ± 9.8
1.0)
±