GASOLINE ENGINE 8.1 S INBOARD MODELS
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Installation Requirements
Engine Bed
Distance between starboard and port engine mount is 22-1/2 in. (572 mm). Engine bed must
position engine so that a minimum of 1/4 in. (6 mm) up and down adjustment still exists on
all 4 mounts after performing final engine alignment. This is necessary to allow for realigning
engine in the future.
NOTE: Although the engine mounts allow some adjustment, it is a good practice to ensure
that the front and rear mount locations in the vessel are in parallel planes. This may be
checked by tying a string from the left front mount location to the right rear mount location
and another from right front to left rear. The strings should touch where they cross.
Engine Compartment
WARNING
Boating standards (NMMA, ABYC) and Coast Guard regulations must be adhered
to when constructing the engine compartment.
Care must be exercised in the design and construction of the engine compartment. Seams
must be located so that any rain water that may leak through the seams, is directed away
from the air intake system.
CAUTION
Water that runs onto the air intake may enter the engine and cause serious damage
to internal engine parts.
Engine compartments are being designed to be quieter. Insulation is the most common
material used to deaden the engine sound. Normally, the quieter the engine compartment,
the more insulation material used, resulting in less air space inside. The less air space inside
the engine compartment, the hotter the inside air temperature. Attention must be given to
the air temperature while the engine is running or for a period of time after the engine is shut
off (heat soak). Refer to the following information on Engine Compartment Ventilation.
VENTILATION
According to Boating standards (NMMA, ABYC and others) and Coast Guard regulations
the engine compartment ventilation system has multiple tasks. Included are the following:
•
To supply the engine with combustion air.
•
To maintain a low temperature in the engine compartment.
Fresh air should enter the engine compartment as low as possible and the heated air should
be discharged from the highest point.
When sufficient ventilation is not provided, too much heat can build-up inside of engine
compartment and cause vapor locking. The engine will not want to restart after it has been
shut off for a short period of time. If it does restart, the engine will quit when given the throttle
to get the boat up on plane or to pull up a water skier.
For engines utilizing fuels containing alcohol and the newer reformulated gasolines (Refer
to OEM Service Bulletin 95-2) proper ventilation is more critical to prevent vapor locking.
If a separate air shaft (or similar) is used to provide engine compartment ventilation or
additional ventilation, care must be taken to prevent seawater and spray from entering it.
