Yanmar marine engine 6LPA-STP2, 6LPA-STZP2. Manual - part 14

PERIODIC MAINTENANCE

6LPA Series Operation Manual

55

12/05

Note: 

These procedures are considered normal maintenance and are performed at the owner’s expense.

Seawater 

Cooling 

System

Check seawater 

outlet discharge

c

During 

Oper-

ation

Check or replace 

the seawater 

pump impeller

z

Check or replace 

the zinc anodes

‘

Check and clean 

the seawater 

passage

z

Piping

Clean or replace 

the exhaust / 

water mixing 

elbow

z

Check or replace 

fuel line and 

rubber hoses

c

z

Electrical 

System

Check the alarm 

and indicators

c

Check the 

electrolyte level in 

the battery

c

Adjust the tension 

of the alternator 

V-belt or replace 

V-belt

c

z

Remote 

Control 

Handle

Check and 

lubricate the 

remote control 

cable operation

c

Adjust the remote 

control cable

c

Intake and 

Exhaust 

System

Wash turbo-

charger blower

z

Clean air cleaner

c

Adjust the intake 

and exhaust valve 

clearance

z

Initial

250

z

Lap the intake and 

exhaust valves

z

Miscel-

laneous

Check and adjust 

the power steering 

oil pump belt 

(6LPA-STZP2)

c

Replace the 

timing belt

z

Replace the front 

rubber damper

z

c

: Check or Clean 

‘

: Replace 

z

: Contact your authorized Yanmar marine dealer or distributor

System Item 

Periodic Maintenance Interval

Daily

Every 50 
hours or 

monthly 

whichever 

comes first

Every 125 

hours or

6 months 

whichever 

comes first

Every 250 

hours or 

1 year 

whichever 

comes first

Every 500 

hours or

2 years 

whichever 

comes first

Every 1000 

hours or 

4 years 

whichever 

comes first

Every 1250 

hours or

5 years 

whichever 

comes first

PERIODIC MAINTENANCE

56

6LPA Series Operation Manual

PERIODIC MAINTENANCE 
PROCEDURES

WARNING

Exposure Hazard. 
ALWAYS wear personal protective 
equipment when performing periodic 
maintenance procedures.

Daily Checks

Before you head out for the day, make sure 
the Yanmar engine is in good operating 
condition.

NOTICE

It is important to perform the daily checks 
as listed in this Operation Manual. Periodic 
maintenance prevents unexpected 
downtime, reduces the number of 
accidents due to poor engine performance 
and helps extend the life of the engine.

Make sure you check the following items.

Visual Checks

1. Check for engine oil leaks.
2. Check for fuel leaks.

WARNING

Piercing Hazard. 
Avoid skin contact with the 
high-pressure diesel fuel spray 
caused by a fuel system leak, such as 
a broken fuel injection line. 
High-pressure fuel can penetrate 
your skin and result in serious injury. 
If you are exposed to high-pressure 
fuel spray, obtain prompt medical 
treatment.

NEVER check for a fuel leak with your 
hands. 
ALWAYS use a piece of wood or 
cardboard. Have your authorized 
Yanmar Marine dealer or distributor 
repair any damage.

3. Check for engine coolant leaks.
4. Check for damaged or missing parts.
5. Check for loose, missing or damaged 

fasteners.

6. Check the electrical harnesses for 

cracks, abrasions, and damaged or 
corroded connectors.

7. Check hoses for cracks, abrasions, and 

damaged, loose or corroded clamps.

8. Check the fuel filter / water separator 

for presence of water and 
contaminants. If you find any water or 
contaminants, drain the fuel filter / 
water separator. See Draining Fuel 
Filter / Water Separator on page 60

. If 

you have to drain the fuel filter / water 
separator frequently, drain the fuel tank 
and check for the presence of water in 
your fuel supply. See Draining Water 
From the Fuel Tank on page 60

.

NOTICE

If any problem is noted during the visual 
check, the necessary corrective action 
should be taken before operating the 
engine.

Check Diesel Fuel, Engine Oil and 
Engine Coolant Levels

Follow the procedures in Diesel Fuel on 
page 26 

, Engine Oil on page 30  and 

Engine coolant on page 33 

 to check these 

levels.

PERIODIC MAINTENANCE

6LPA Series Operation Manual

57

12/05

Checking and Refilling Marine Drive 
Oil

See Marine Drive Oil on page 32

.

Checking the Battery Electrolyte 
Level

Check the battery electrolyte level before 
use. See Checking the Battery Electrolyte 
Level (Serviceable Batteries Only) on 
page 61.

Checking the Alternator Belt 

Check the belt tension before use. See 
Checking and Adjusting the Alternator 
V-Belt Tension on page 66.

Checking the Remote Control 
Handle

Check the operation of the remote control 
handle and ensure it moves smoothly. If it 
is hard to operate, grease the joints of the 
remote control cable and lever bearings. If 
the lever is too loose, adjust the remote 
control cable. See Checking and Adjusting 
Remote Control Cables on page 64

.

Checking the Alarm Indicators

When operating the start switch on the 
instrument panel, check that there is no 
alarm message on the display and the 
alarm indicators work normally. See 
Control Equipment on page 15

.

Preparing Fuel, Oil and Coolant in 
Reserve

Prepare sufficient fuel for the days 
operation. Always store engine oil and 
coolant in reserve (for at least one refill) 
onboard, to be ready for emergencies.

Perform the following maintenance after 
the initial 50 hours of operation.

• Changing the Engine Oil and 

Replacing the Engine Oil Filter 
Element

 

• Changing the Fuel Filter Element

Changing the Engine Oil and 
Replacing the Engine Oil Filter 
Element

The engine oil on a new engine becomes 
contaminated from the initial break-in of 
internal parts. It is very important that the 
initial oil replacement is performed as 
scheduled.

It is easiest and most effective to drain the 
engine oil after operation while the engine 
is still warm. 

WARNING

If you must drain the engine oil while it 
is still hot, stay clear of the hot engine 
oil to avoid being burned. ALWAYS wear 
eye protection.

After Initial 50 Hours of 
Operation

PERIODIC MAINTENANCE

58

6LPA Series Operation Manual

 Figure 1

Figure 1 

1. Turn the engine OFF.
2. Remove the engine oil dipstick. Attach 

the oil drain pump (if equipped) and 
pump out the oil.
For easier draining, remove the engine 
oil fill cap.

NOTICE

Prevent dirt and debris from 
contaminating engine oil. Carefully 
clean the dipstick and the surrounding 
area before you remove the dipstick.

3. Turn the engine oil filter (Figure 1, (1)) 

counterclockwise with a wrench.

4. Remove the engine oil filter.
5. Apply a small amount of engine oil to 

the seal of the new filter.

6. Install a new filter element and tighten 

by hand until the seal touches the 
housing.

7. Turn filter an additional 3/4 turn with a 

filter wrench. 

 Figure 2

Figure 2 

8. Remove filler cap (Figure 2, (1)) and fill 

with new engine oil through filler port. 
See Engine Oil on page 30

. 

NOTICE

NEVER mix different types of engine oil. 
This may adversely affect the lubricating 
properties of the engine oil.
NEVER overfill. Overfilling may result in 
white exhaust smoke, engine overspeed 
or internal damage.

9. Perform a trial run and check for oil 

leaks.

10.Approximately 10 minutes after 

stopping the engine, remove the oil 
dipstick and check the oil level. Add oil 
if the level is too low.

11.Dispose of waste properly.

(1)

0004899

(1)

0004900