PRODUCT OVERVIEW
12
8LV 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 lower than 80 °C (176 °F).
During the first 10 hours of operation, the engine
should be run at maximum min
-1
(rpm) minus 400
to 500 min
-1
(rpm) (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.
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 lube 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 rev up the engine (i.e. increase the engine
speed for a short time) to clean the carbon from the
cylinders and fuel injection valve.
Perform this procedure in seawaters:
• With the position of marine gear 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
(rpm) most of
the time (approximately 70 % load), with a 10
minute run at maximum minus 300 min
-1
(rpm)
(approximately 80 % load) every 30 minutes and a
4 - 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 rev up the
engine.
To complete engine break-in, perform After Initial
50 Hours of Operation maintenance procedures on
page 43.
8LV_OPM.book 12 ページ ２０１１年１月１１日 火曜日 午後１２時８分
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