Yanmar 6LY3 series Service Manual page 55

Periodic Maintenance Procedures
12/05
Figure 4-27
(1)
(3)
(2)
Figure 4-27
1 – Turbocharger
2 – Blower Wash Hole
3 – Air Silencer
3. Run the engine at cruise power and inject about
50 cc of cleaning agent in small amounts
through the hole in the silencer at about
10 second intervals as shown in Figure 4-27.
NOTICE: NEVER inject large quantities of fluid
into the blower all at once. Water hammer can
damage the components of the turbocharger. If
the air silencer (air cleaner) is removed from the
turbocharger, decrease the amount of cleaning
agent used to clean the turbocharger. Ensure
that all parts are dry and reassemble.
4. Wait 3 minutes while engine continues to run.
5. Inject another 50 cc of fresh water in small
amounts at about 10 second intervals.
6. Run engine for about 10 minutes to dry the
turbocharger.
7. Check engine power output. Repeat steps 4
through 7 until power output is satisfactory.
8. Reinstall the M8 bolt and washer to the silencer
housing and the intercooler drain plug.
6LY3 Service Manual
Flush the Intercooler
Rust and scale buildup in the intercooler can
reduce engine performance by 10%.
Intercooler contamination causes the engine output
to fall. If a drop in engine output is noted (by about
10%), flush and clean the intercooler.
1. Remove the cover on the flywheel end of the
2. If rust or scale is seen inside the tubes, remove
0006186
3. Clean the tubes with a wire brush, if necessary.
4. Flush tubes with fresh water.
5. Reinstall intercooler.
Check the Wiring Connections
Check for loose wire connections.
Tighten All Major Nuts and Bolts
Over time and with extended vibration, fasteners
may come loose.
Check and retighten the following nuts, bolts and
fasteners, as applicable:
1. Flexible engine mount bolts
2. Shaft coupling bolts
3. Exhaust flange bolts
4. Intake silencer fasteners
5. Other nuts and bolts
Retorque the major nuts and bolts below. See
Service Standards on page 14-3 for the tightening
torques of the major parts.
1. Cylinder head bolts
2. Crankshaft pulley bolts
3. Fuel injection nozzle set bolts
4. Fuel injection pipe joint nut
5. Rod bolts
6. Flywheel retainer bolts
7. Bearing cap bolts
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE
intercooler and inspect the inside of each tube
for rust or scale buildup from seawater.
the intercooler from the engine.
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