Yanmar marine engine 6LPA-STP2, 6LPA-STZP2. Manual - part 12

ENGINE OPERATION

6LPA Series Operation Manual

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12/05

5. Remove the key and cover the key switch 

with the moisture cap.

NOTICE

Continue to hold the stop button in until the 
engine is completely stopped. If the button 
is released before the engine has 
completely stopped, it may restart. If the 
engine does not shut off when the engine 
stop button is pushed, close the fuel cock 
on the fuel tank..

6. Turn off the battery switch (if equipped).
7. Close the fuel cock.
8. Close the seacock (if equipped).

NOTICE

• Be sure to close the seacock. Neglecting 

to close the seacock could allow water to 
leak into the boat and may cause it to 
sink. 

• If seawater is left inside the engine, it 

may freeze and damage parts of the 
cooling system when the ambient 
temperature is below 0°C (32°F).

CHECKING THE ENGINE 
AFTER OPERATION

• Check that the power switch is off and 

that the battery switch (if equipped) is 
turned to off.

• Fill the fuel tank. See Filling the fuel tank: 

on page 29

.

• Close seawater cock(s).

• If there is a risk of freezing, check that 

the cooling system contains enough 
coolant. See Engine Oil Specifications 
on page 30

.

• If there is a risk of freezing, drain the 

seawater system. See Drain Seawater 
Cooling System on page 74

.

• At temperatures below 0°C (32°F), drain 

seawater system and connect the engine 
heater (if equipped).

ENGINE OPERATION

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6LPA Series Operation Manual

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6LPA Series Operation Manual

49

PERIODIC 

MAINTENANCE

INTRODUCTION

This section of the Operation Manual 
describes the procedures for proper care 
and maintenance of the engine.

SAFETY PRECAUTIONS

Before performing any maintenance 
procedures within this section, read the 
following safety information and review the 
Safety

 section on page 3.

WARNING

Crush Hazard

If the engine needs to be 
transported for repair, have a 
helper assist you attach it to a 
hoist and load it on a truck.

The engine lifting eyes are engineered 
to lift the weight of the marine engine 
only. ALWAYS use the engine lifting 
eyes when lifting the engine. 

Additional equipment is necessary to 
lift the marine engine and marine gear 
together. ALWAYS use lifting equipment 
with sufficient capacity to lift the marine 
engine. 

PERIODIC MAINTENANCE

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6LPA Series Operation Manual

WARNING

Welding Hazard

• ALWAYS turn off the battery switch (if 

equipped) or disconnect the negative 
battery cable and the leads to the 
alternator when welding on the 
equipment.

• Remove the engine control unit 

multi-pin connector. Connect the weld 
clamp to the component to be welded 
and as close as possible to the 
welding point.

• NEVER connect the weld clamp to the 

engine or in a manner which would 
allow current to pass through a 
mounting bracket.

• When welding is completed, 

reconnect the alternator and engine 
control unit prior to reconnecting the 
batteries.

Entanglement Hazard

NEVER leave the power 
switch on when you are 
servicing the engine. 
Someone may accidentally 
start the engine and not 

realize you are servicing it.

Shock Hazard

ALWAYS turn off the battery 
switch (if equipped) or 
disconnect the negative 
battery cable before servicing 
the equipment.

ALWAYS keep the electrical connectors 
and terminals clean. Check the 
electrical harnesses for cracks, 
abrasions, and damaged or corroded 
connectors.

NEVER use undersized wiring for the 
electrical system.

Tool Hazard

ALWAYS remove any tools or shop rags 
used during maintenance from the area 
before operation.

NOTICE

Any part which is found defective as a 
result of inspection, or any part whose 
measured value does not satisfy the 
standard or limit, must be replaced. 

Modifications may impair the engine’s 
safety and performance characteristics 
and shorten the engine’s life. Any 
alterations to this engine may void its 
warranty. Be sure to use Yanmar genuine 
replacement parts.