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S
ECTION
6. F
W
RESH
ATER
The fresh water cooling system is a closed system
which helps protect engines from internal corrosion
and provides more even distribution of engine
temperature. Change the coolant annually.
A. C
R
OOLANT
ECOMMENDATIONS
The standard mixture of water and coolant is a
mixture of 30% environmentally safe, nontoxic
antifreeze and 70% water, which protects to 0°F
(-18°C). This will allow the coolant to expand
properly and maintain normal operating engine
temperature. In colder climates, the coolant level
should be increased to 50/50, which protects to -
34°F (-37°C), for proper coverage. To find engine
coolant requirements for the specific engine on
your yacht, refer to your Engine Owner's
Manual in the Owner's Manual Packet.
7. E
M
NGINE
OUNTS
The adjustable type engine mounts permit
adjustment sideways as well as vertically. Vertical
adjustment nuts lock up or down on the threaded
vertical stud, with a slot provided to allow side to
side adjustment on the engine.
IMPORTANT: The large adjustment locknuts on
these mounts must be tightened properly to
retain alignment. It is also advisable to spray a
protective coating on the studs and nuts to prevent
corrosion.
E
M
NGINE
OUNT
(F
. 4.4.1)
IG
B
A
ISOLATORS
PLASTIC COVERS
B
4.4
4 • B
ILGE
C
S
OOLING
YSTEM
:
A
& U
NDERWATER
8. M
G
ARINE
EARS
A. R
G
EDUCTION
A reduction gear reduces the rotating speed of the
propeller shaft in relation to the engine RPM. This permits
the use of a larger propeller while allowing the engine to
attain its rated RPM, thereby increasing efficiency.
B. R
G
EVERSE
EARS
The reverse gear incorporates the clutch and
controls the rotation of the propeller. The position
of the clutch control or shifting lever indicates the
motion which the clutch and reverse gear are
transmitting. The center position of the lever
indicates neutral. Engine RPM should never
exceed 1000 when engaging or disengaging the
clutch. Higher RPM will result in unnecessary
wear and shortened life of the unit, and perhaps
breakage.
Marine reverse gears are hydraulically operated,
thereby making it imperative to periodically maintain
and check oil level. If the correct oil level is not
maintained, slippage occurs, causing damage to
the clutch plates. Too much oil will cause foaming
and erratic clutch operation. For additional
information see the Engine Operator's Manual.
9. E
E
NGINE
XHAUST
The exhaust system on Sea Ray
inboard engines is designed so that water from the
raw water cooling system enters the exhaust
system through elbows (engine side) where water
and exhaust are mixed. Water and exhaust are then
pumped through the mufflers and then overboard
through the exhaust outlet. Make sure water is
flowing from the exhaust outlets while the
engines are operating. Prior to every boat use,
examine the exhaust system fittings to ensure
tightness.
A drain plug is located on each muffler. When
servicing or winterizing, remove the plug to drain
the water out of each muffler. Replace the plug after
all water has drained from the muffler.
G
EAR
EARS
S
YSTEM
®
boats with
®
( 425 Sundancer
390 Sundancer
®
)
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