Sea Ray 390 Sundancer Owner's Manual download pdf (Page 84)

390 Sundancer

(

425 Sundancer

)4.4

SECTION 4 • BILGE & UNDERWATER GEAR

8. MARINE GEARS

A. REDUCTION GEARS

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. REVERSE GEARS

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. ENGINE EXHAUST SYSTEM

The exhaust system on Sea Ray

boats with

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.

6. FRESH WATER COOLING SYSTEM

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. COOLANT RECOMMENDATIONS:

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. ENGINE MOUNTS

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.

ENGINE MOUNT

(FIG. 4.4.1)

ISOLATORS

PLASTIC COVERS

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Sea Ray 390 Sundancer Owner's Manual Page 84

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