PERIODIC MAINTENANCE
Periodic Maintenance Procedures
4-22
6LY3 Service Manual
© 2007 Yanmar Marine International
Replace the Engine Oil and Engine Oil Filter
See Replace the Engine Oil and Engine Oil Filter
on page 4-8
.
Check the Seawater Pump Impeller
See Disassembling the Seawater Pump on
page 7-6
.
Replace the Zinc Anode
The frequency for replacing the zinc anode plug
varies depending on the characteristics of the
seawater and operational conditions. Inspect the
zinc anode
(Figure 4-25, (1))
at its scheduled
maintenance interval and remove the corroded
area on the surface. Replace the zinc anode when
it has decreased to less than 1/2 of the original
size. If replacement of zinc anode is neglected,
seawater will corrode the coolant system. This will
cause leaks and damage.
NOTICE: Zinc anode
plugs are identified with the label shown in
(Figure 4-25, (2)). Close the seacock before
removing the plug.
Figure 4-25
Figure 4-25
1 – Zinc Anode
2 – Zinc Anode Plug
3 – Identification Label
Figure 4-26
Figure 4-26
1 – Zinc Anode Location
2 – Heat Exchanger
Clean the Air Intake Silencer
Disassemble the intake silencer and clean the
inside thoroughly.
1. Remove the silencer by taking off the clamp.
2. Clean the element with a neutral detergent.
3. Reassemble after it is completely dry.
Clean the Exhaust / Water Mixing Elbow
The mixing elbow is attached to the turbocharger.
The exhaust gas is mixed with seawater in the
mixing elbow.
1. Clean dirt and scale out of the exhaust gas
passage. Clean and clear the seawater
passage in the mixing elbow.
2. Repair any cracks or damage to the mixing
elbow by welding or replacement.
3. Inspect the gasket and replace if necessary.
Clean the Turbocharger Blower
Dirty fins on the turbocharger blower lead to engine
performance reductions. Clean the turbocharger
blower at its scheduled maintenance interval or
sooner if power output drops by 10%.
1. Prepare the cleaning agent, fresh water and a
small pitcher.
2. Remove the M8 bolt and washer from
(Figure 4-27, (3))
the blower wash hole in the
silencer. Remove the drain plug (M8 bolt and
washer) from the intercooler.
00061
8
4
(1)
(2)
(
3
)
00061
8
5
(1)
(2)
