Yanmar marine engine 6LPA-STP2, 6LPA-STZP2. Manual - part 2

SAFETY

6LPA Series Operation Manual

12/05

NOTICE

If you have an installation with two or three
engines and only one engine is operating,
the water pickup (thru-hull) of the
non-running engine(s) should be closed.
This will prevent water from being forced
past the seawater pump and eventually
finding its way into the engine. The result
of water entering the engine could cause
seizure or other serious problems.

If you have an installation with two or three
engines, and only one engine is operating,
please note that if the propeller shaft
thru-hull (stuffing box) is lubricated by
engine water pressure and the engines are
interconnected, care must be taken that
water from the running engine does not
enter the exhaust of the non-running
engine(s). This water could cause seizure
of the non-running engine(s). See your
authorized Yanmar Marine dealer or
distributor for a complete explanation of
this condition.

If you have an installation with two or three
engines, and only one engine is operating,
it is important to limit the amount of throttle
applied to the running engine. If you
observe black smoke or movement of the
throttle does not increase engine speed,
you are overloading the engine that is
running. Immediately throttle back to
approximately 2/3 throttle or to a setting
where the engine performs normally.
Failure to do so may cause the running
engine to overheat or cause excess carbon
buildup which may shorten the engine’s
life.

NEVER turn off the battery switch (if
equipped) or short the battery cables
during operation. Damage to the electrical
system will result.

SAFETY

6LPA Series Operation Manual

LOCATION OF SAFETY DECALS

Figure 1

show the location of safety decals on Yanmar 6LPA series marine engines.

6LPA Engines

Figure 1

1 – Part Number: 120324-07240
2 – Part Number: 128296-07260
3 – Part Number: 119773-07280

4 – Part Number: 128296–07300
5 – Part Number: 128296–07360

0004813

NEVER pour the
engine oil across
the full line.

119773-07280

DANGER

FULL

LOW

(1)

(2)

(3)

(4)

(5)

6LPA Series Operation Manual

PRODUCT OVERVIEW

YANMAR 6LPA SERIES
FEATURES AND
APPLICATIONS

The 6LPA series are four-stroke direct
injection diesel engines equipped with
liquid coolant systems.

The 6LPA-STP2 engines are equipped
with a marine gear (ZF63A1 or KMH50A,
KMH50V).

The 6LPA-STZP2 engines are equipped
with a stern drive (ZT370, Mercruiser
Bravo).

These engines are designed for pleasure
craft use.

The engines are equipped with a marine
gear or sail drive unit.

These engines are designed for pleasure
craft use.

It is recommended that new vessels be
propped so the engines can operate at 50
to 100 min

-1

above the fuel stop power

engine speed to allow for some added
weight and hull resistance.

Failure to do so can lead to reduced vessel
performance, lead to increased smoke
levels and cause permanent damage to
your engine.

The engine must be installed correctly with
coolant lines, exhaust gas lines and
electrical wiring. Any auxiliary equipment
attached to the engine should be easy to
use and accessible for service. To handle
the drive equipment, propulsion systems
(including the propeller) and other inboard
equipment, always observe the
instructions and cautions given in the
operation manuals supplied by the
shipyard and equipment manufacturers.

The 6LPA series engines are designed to
be operated at maximum throttle
(3800 min

-1

) for less than 5% of total

engine time (30 minutes out of every 10
hours) and cruising speed (2800 min

-1

less) for less than 90% of total engine time
(9 hours out of every 10 hours).

The laws of some countries may require
hull and engine inspections, depending on
the use, size and cruising area of the boat.
The installation, fitting and surveying of
this engine all require specialized
knowledge and engineering skills. See
Yanmars local subsidiary in your region or
your authorized Yanmar Marine dealer or
distributor.

PRODUCT OVERVIEW

6LPA Series Operation Manual

New Engine Break-In

As with all reciprocating engines, the way
your engine is operated during its first 50
hours of operation plays a very significant
role in determining how long it will last and
how well the engine will perform over its
lifetime.

A new Yanmar diesel engine must be
operated at suitable speeds and power
settings during the break-in period to make
the sliding parts, such as piston rings,
break-in properly and to stabilize engine
combustion.

During the break-in period, the engine
coolant temperature gauge should be
monitored; temperature should be
between 71° and 87°C (160° and 190°F).

During the first 10 hours of operation, the
engine should be run at maximum engine
speed minus 400 to 500 min

-1

(approximately 60 to 70% of load) most of
the time. This will ensure the sliding parts
break in properly. During this period, avoid
operating at maximum engine speed and
load to avoid damaging or scoring sliding
parts.

NOTICE

Do not operate at WOT (wide open throttle)
for more than a minute at a time during the
first 10 hours of operation.

Do not operate the engine at low idle or at
low speed and light load for more than
30 minutes at a time. Since unburned fuel
and engine oil will adhere to the piston
rings when operating at low speeds for
long periods, this will interfere with proper
movement of the rings and the engine oil
consumption may increase. Low idle
speed does not allow break-in of sliding
parts.

If operating engine at low speed and light
load, you must race the engine to clean the
carbon from the cylinders and fuel injection
valve.

Perform this procedure in open waters:

• With the clutch in NEUTRAL, accelerate

from the low-speed position to the
high-speed position briefly.

• Repeat this process five times.

Once past the initial 10 hours until 50
hours, the engine should be used over its
full operating range, with special emphasis
on running at relatively high power
settings. This is not the time for an
extended cruise at idle or low speed. The
boat should be run at maximum speed
minus 400 min

-1

most of the time

(approximately 70% load), with a 10
minute run at maximum minus 200 min

-1

(approximately 80% load) every
30 minutes and a 4 to 5 minute period of
operation at WOT (wide open throttle)
once each 30 minutes. During this period,
be sure not to operate your engine at low
speed and light load for more than
30 minutes. If operating engine at low
speed and light load by necessity, just after
the low idle operation, be sure to race the
engine.

To complete engine break-in, perform After
Initial 50 Hours of Operation

maintenance

procedures. See After Initial 50 Hours of
Operation on page 57.

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