Gemini Owners Manual.pub - Gemini Gems
Gemini Owners Manual.pub - Gemini Gems
Gemini Owners Manual.pub - Gemini Gems
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<strong>Gemini</strong> 105Mc Owner’s <strong>Manual</strong><br />
Engine<br />
The standard <strong>Gemini</strong> 105Mc engine is the Westerbeke<br />
27 horsepower, Model 30B. The 27-hp diesel is<br />
linked to a sonic outdrive leg and provides excellent<br />
fuel economy and battery charging from the 55-amp<br />
alternator.<br />
The use of diesel is safe and can be used for other<br />
appliances on the boat such as heaters and generators.<br />
This engine weighs about 400 lbs. The fuel<br />
economy will range from 6 to 12 miles to the gallon<br />
depending on speed and conditions.<br />
The Westerbeke engine is mounted on the bridge<br />
deck under the center cockpit hatch. The gearbox at<br />
the back of the engine is connected through a flexible<br />
coupling to the Sillette sonic out-drive leg. The<br />
engine is accessible through all three cockpit lockers<br />
and aft deck hatches.<br />
The oil dipstick, oil filter, and water pump are located<br />
behind the starboard side breakaway panel.<br />
Access to the port side is by unscrewing the side<br />
panel. Please refer to your Westerbeke manual for<br />
oil change information and specific operating instructions<br />
including service periods.<br />
The 30B engine uses about 3 1/8 quart of SAE 10W-<br />
30 weight oil. The transmission uses about 7/8<br />
quart of the same type oil.<br />
Refer to the back of the manual for an addendum<br />
and for how to contact your closest authorized<br />
Westerbeke Service Center.<br />
Cooling Water<br />
The cooling water for the engine comes into the ship<br />
through a seacock under the starboard aft bed. The<br />
seacock has (3) positions: In from the sea, closed,<br />
and a third position which enables connecting a hose<br />
to the open barb on the seacock for winterizing.<br />
There is a water filter by this seacock. The engine is<br />
a freshwater-cooled engine with salt water-cooling<br />
the freshwater in a heat exchanger. There is a fresh<br />
water header tank on the wall above the engine.<br />
Gear Lever / Throttle<br />
The <strong>Gemini</strong> 105Mc comes with a single lever throttle<br />
and gear control (UFlex B73 Single Lever Top Mount<br />
Engine Control) located on the starboard side of the<br />
wheel. With the lever in the neutral position, the<br />
handle can be pulled out 1/4" to disengage the gears<br />
so the throttle can be operated without moving the<br />
boat.<br />
Once the lever drops back to the neutral position,<br />
which is vertical, the gears are engaged. Pushing the<br />
lever forward 45º engages forward. The rest of the<br />
Engine, Drive Leg, Fuel<br />
movement increases the engine speed. Moving the<br />
lever back engages reverse.<br />
Fuel Tanks / Gauges<br />
The <strong>Gemini</strong> 105Mc has (2) two 18 gallon fuel tanks,<br />
each located either side of the engine under the aft<br />
deck. The fuel gauges are located on the instrument<br />
panel. There are (2) two fuel selector valves located<br />
under the engine hatch on the center stern. One is<br />
fuel supply to the engine. The other is the return<br />
valve returning the unused diesel fuel back to the<br />
tank. The valves simply point to the tank in use.<br />
Both valves should point to the same tank.<br />
Following the fuel valves is a glass Racor fuel filter<br />
on the rear wall. Following the fuel filter, the fuel<br />
goes to the engine electric pump and then to another<br />
fuel filter. The Westerbeke uses an electric<br />
pump and is self-priming.<br />
Diesel fuel in tanks can grow a fungus, akin to a<br />
black sooty deposit. This deposit can block the<br />
hoses, filters, pumps and injectors. Even a filter will<br />
not help resolve the problem as the hoses leading to<br />
the filter can get blocked. To stop this potential<br />
problem, a diesel additive can be added to the fuel.<br />
Diesel fuel is also subject to water condensation. It<br />
is advisable to leave the tanks full to reduce the<br />
occurrence of water condensation.<br />
Hot Water and Cabin Heater<br />
Just inside the engine compartment are (2) two 3/8”<br />
black hoses that connect to a brass junction with a<br />
valve. Continuing from the brass junction are two<br />
(2) 5/8” hoses. Each hose connects to the hot water<br />
heater and the optional cabin heater.<br />
With the valve at the junction in the horizontal position,<br />
fresh water from the engine is heating the water<br />
in the water heater. With the junction valve<br />
vertically down, the water supply is shut off.<br />
With the optional cabin heater there is an additional<br />
valve in the port aft cabin under the bed. This valve<br />
can open the engine hot water to the cabin heater as<br />
well. The optional heater is the Heater Craft 500H<br />
unit capable of 28,000 BTU.<br />
Sillette Sonic Drive Leg<br />
Please read through the Sillette manual thoroughly.<br />
The sonic drive leg will provide many years of dependable<br />
service if used correctly and properly<br />
maintained. Improper use can result in breakage.<br />
Slamming the leg down into forward with the full<br />
throttle before the leg has locked into place can<br />
cause damage. Always bring the leg down in a slow<br />
and controlled manner and do not throw the throttle<br />
completely forward until the leg clicks into place. If<br />
Copyright © 2004 Performance Cruising Inc.<br />
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