PERIODIC MAINTENANCE
Periodic Maintenance Schedule
4-4 6LY3 Service Manual
© 2007 Yanmar Marine International
PERIODIC MAINTENANCE SCHEDULE
Daily and periodic maintenance is important to keep the engine in good operating condition. The following is
a summary of maintenance items by periodic maintenance intervals. Periodic maintenance intervals vary
depending on engine application, loads, diesel fuel and engine oil used and are hard to establish definitively.
The following should be treated only as a general guideline.
c: Check : Replace z: Contact your authorized Yanmar Marine dealer or distributor
System Item
Before
Starting
Every 50
Hours or
One
Month*
Every 250
Hours or
One Year*
Every 500
Hours or
2 Years*
Every 1000
Hours or
4 Years*
Every 2000
Hours or
8 Years*
Whole Visually inspect the engine. {
Fuel System
Check the fuel level. {
Drain the fuel tank. {
Drain the filter and the water
separator.
{
Replace the filter element.
Check the injection spray
pattern.
●
Initial
●
Overhaul the fuel feed pump. ●
Replace the fuel hoses. Every two years or 2,000 hours of operation.*
Lubricating
System
Check the oil
level.
Crankcase {
Change the
oil.
Crankcase
Initial
Replace the oil filter element.
Initial
Clean the oil cooler.
●
Coolant
System
Check the seawater outlet.
{
During
operation
Check the coolant level. {
Check the seawater pump
impeller.
{
Replace the engine coolant.
Every year
When the Long Life Coolant (LLC) is used of a specified type (See Check the
Coolant Level on page 4-7), replacement period of two years can be obtained.
Clean and check the
seawater and coolant
passages.
●
Clean the seawater and
coolant system.
●
Replace the zinc anode plug.
* Whichever comes first.
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