Yanmar marine engine 6LPA-STP2, 6LPA-STZP2. Manual - part 7

BEFORE YOU OPERATE

6LPA Series Operation Manual

12/05

• Even biodiesel fuels that comply with a

suitable standard as delivered will
require additional care and attention to
maintain the quality of the fuel in the
equipment or other fuel tanks. It is
important to maintain a supply of clean,
fresh fuel. Regular flushing of the fuel
system, and / or fuel storage containers,
may be necessary.

• The use of biodiesel fuels that do not

comply with the standards as agreed to
by the diesel engine manufacturers and
the diesel fuel injection equipment
manufacturers, or biodiesel fuels that
have degraded as per the precautions
and concerns above, may affect the
warranty coverage of your engine.

Additional Technical Fuel
Requirements

• The fuel cetane number should be 45 or

higher.

• The sulfur content must not exceed 0.5%

by volume. Less than 0.05% is preferred.

• NEVER mix kerosene, used engine oil or

residual fuels with the diesel fuel.

• Water and sediment in the fuel should

not exceed 0.05% by volume.

• Keep the fuel tank and fuel-handling

equipment clean at all times.

• Ash content not to exceed 0.01% by

volume.

• Carbon residue content not to exceed

0.35% by volume. Less than 0.1% is
preferred.

• Total aromatics content should not

exceed 35% by volume. Less than 30%
is preferred.

• PAH (poly cyclic aromatic hydrocarbons)

content should be below 10% by volume.

• Do not use Beside.

• Do not use kerosene or residual fuels.

Handling of Diesel Fuel

WARNING

Fire and Explosion Hazard.
Only fill the fuel tank with diesel fuel.
Filling the fuel tank with gasoline may
result in a fire and will damage the
engine. NEVER refuel with the engine
running. Wipe up all spills immediately.
Keep sparks, open flames or any other
form of ignition (match, cigarette, static
electric source) well away when
refueling.

Fire and Explosion Hazard.
ALWAYS put the diesel fuel container
on the ground when transferring the
diesel fuel from the pump to the
container. Hold the hose nozzle firmly
against the side of the container while
filling it. This prevents static electricity
buildup which could cause sparks and
ignite fuel vapors.

1. Water and dust in the fuel may cause

engine failure. When fuel is stored, be
sure that the inside of the storage
container is clean and dry, and that the
fuel is stored away from dirt or rain.

Figure 1

Figure 1

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BEFORE YOU OPERATE

6LPA Series Operation Manual

2. Keep the fuel container stationary for

several hours to allow any dirt or water
to settle to the bottom of the container.
Use a pump to extract the clear, filtered
fuel from the top of the container.

Fuel Tank (Optional)

Figure 2

Figure 2

1 – Sediment Bowl
2 – Drain Cock
3 – Fuel Line to Engine

Install a drain cock (Figure 2, (2)) at the
bottom of the fuel tank to remove water
and contaminants from the sediment bowl
(Figure 2, (1)).

The fuel outlet should be positioned 20 to
30 mm (0.75 to 1.125 in.) above the
bottom of the tank so that only clean fuel is
distributed to the engine.

Fuel System

Install the fuel line from the fuel tank to the
fuel injection pump as shown in Figure 3.

Figure 3

Figure 3

1 – Fuel Filter
2 – Fuel Feed Pump (Priming

Lever)

3 – Fuel / Water Separator

(Optional)

4 – Approximately 20 - 30 mm (0.75

- 1.125 in.)

5 – Within 500 mm (20 in.)
6 – Drain Cock
7 – Fuel Cock
8 – Fuel Return Line
9 – To Fuel Injection Pump

10 – Fuel Tank

Filling the Fuel Tank

Before filling fuel tank for the first
time:

WARNING

Fire and Explosion Hazard.
NEVER refuel with the engine running.

Rinse fuel tank with kerosene or diesel
fuel. Dispose of waste properly.

(1)

(2)

(3)

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BEFORE YOU OPERATE

6LPA Series Operation Manual

12/05

Filling the fuel tank:

WARNING

Fire and Explosion Hazard.
Operate bilge ventilation (blowers) for a
minimum of 5 minutes to purge fumes
from engine compartment after
refueling. Never operate bilge blower
while refueling. Doing so can pump
explosive fumes into the engine
compartment and result in an
explosion.

1. Clean the area around the fuel cap.

2. Remove the fuel cap from the fuel tank.

3. Fill the tank with clean fuel free of oil

and dirt.

WARNING

Fire and Explosion Hazard.
Hold the hose nozzle firmly against
the filler port while filling. This
prevents static electricity buildup
which could cause sparks and ignite
fuel vapors.

4. Stop fueling when the gauge shows the

fuel tank is full.

WARNING

Fire and Explosion Hazard.
NEVER overfill the fuel tank.

5. Replace the fuel cap and hand-tighten.

Over-tightening the fuel cap will
damage it.

Bleeding the Fuel System

Bleeding must be done if any fuel system
maintenance has been performed
(replacement of fuel filter, etc.) or if the
engine does not start after several
attempts.

Figure 4

Figure 4

1 – Priming Pump
2 – Air Bleed Screw

1. Check the fuel level in the fuel tank.

Refill if necessary.

2. Open the fuel cock of the fuel tank.

WARNING

Exposure Hazard.

Always wear safety glasses when
bleeding the fuel system.

(1)

(2)

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BEFORE YOU OPERATE

6LPA Series Operation Manual

3. Loosen the air bleed screw

(Figure 4, (2)) two to three turns.

4. Push up and down on the priming

pump (Figure 4, (1)) to release air out
of the air bleed screw.

5. Continue pumping until a solid stream

of fuel with no air bubbles begins to
flow.

6. Tighten the air bleed screw.

NOTICE

NEVER use an engine starting aid such
as ether. Engine damage will result.

ENGINE OIL

Engine Oil Specifications

Using engine oil that does not meet or
exceed the following guidelines or
specifications may cause seizure of parts,
abnormal wear and shorten engine life.

Service Categories

Use an engine oil that meets or exceeds
the following guidelines and classifications:

• API Service Categories: CD or higher

• SAE Viscosity:

10W30, 15W40. Engine oil 10W30 and
15W40 can be used throughout the year.

NOTICE

• Be sure the engine oil, engine oil storage

containers and engine oil filling
equipment are free of sediment or water.

• Change the engine oil after the first 50

hours of operation and then at every 250
hours thereafter.

• Select the oil viscosity based on the

ambient temperature where the engine
is being operated. See the SAE Service
Grade Viscosity Chart (Figure 5).

• Yanmar does not recommend the use of

engine oil “additives.”

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