Yanmar 6LY3 series, Руководство по обслуживанию

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TROUBLESHOOTING Troubleshooting by Symptom
12/05
6LY3 Service Manual
13-19
© 2007 Yanmar Marine International
Black exhaust smoke.
Faulty fuel injection nozzle. Faulty valve seat. Check the fuel spray
condition with a tester. If a
malfunction is found, send it
to the FIE shop for service or
replacement.
See Fuel Injection Nozzle
Components and Functions
on page 6-26
.
Sticking needle valve.
Wear of seat.
Clogged fuel injection
hole(s).
Decrease in fuel opening
pressure.
Faulty combustion because
of insufficient intake air
volume.
Clogged air cleaner. Clean or replace.
See Troubleshooting the
Fuel Injection System on
page 6-24
.
Decrease in intake air
pressure.
Check the turbocharger.
Clean the blower of
turbocharger.
See Turbocharger
Components and Functions
on page 9-4
.
Charging air temperature is
too high.
Check the impeller of the
seawater pump. Check for a
clogged seawater line and
for dirt in the intercooler core.
See Seawater Pump
Components and Functions
on page 7-6
.
Engine room is not
ventilated.
Check the ventilation. —
Faulty combustion because
of the blow-by gas and the
decreased compression air
pressure.
No valve clearance. Readjust the valve
clearance.
See Service Standards on
page 14-3
.
Faulty contact of the intake /
exhaust valves and seats.
Lap the valve and seat.
Replace valve if necessary.
See Inspecting Intake /
Exhaust Valves and Valve
Guides on page 5-30
.
Seized main moving parts. Disassemble and check.
Replace if necessary.
See Engine on page 5-1
.
Wear of the piston ring. Check and replace.
See Measuring the Piston
Rings on page 5-38
.
Sticking piston ring. Check and clean or replace.
See Measuring the Piston
Rings on page 5-38
.
Miscellaneous. Engine overloaded. Check around propeller and
boat hull.
—
The injection timing is
improper.
Check the injection timing
control and condition. If the
timing is incorrect, reinstall or
replace the timer.
—
Trouble symptom Causes Corrective action Remarks