PRODUCT OVERVIEW
10 GM 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 allow
bearing surfaces and other friction-related
components, such as piston rings and
valve guides, to wear in properly in order to
stabilize engine lubrication and
combustion.
During the break-in period, carefully
observe the engine oil pressure and
engine temperature.
During the first 10 hours of operation, the
engine should be operated 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.
• Never 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 diesel fuel
consumption may increase. Low idle
speed does not allow break-in of sliding
parts.
If operating the engine at low speed and
light load, you must race the engine to
clean the carbon from the cylinders and
the 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 operated 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 every 30 minutes. During this period,
be sure not to operate the engine at low
speed and light load for more than
30 minutes. If operating engine at low
speed and light load is necessary, race the
engine after low idle operation.
To complete engine break-in, perform
After Initial 50 Hours maintenance
procedures. See After Initial 50 Hours of
Operation on page 53.
GM_OM.book 10 ページ ２０１３年６月１０日 月曜日 午後２時２６分
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