J/Boats J/109 Owner's Manual - Engine System
J/109 OWNER GUIDE
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Engine System
The engine and fuel system is engineered to be conveniently accessible for repairs and general
maintenance. Located aft of the companionway ladder, there is access to the front, sides and back of
the engine from which all important functions can be reached; including water strainer, fuel injectors,
fuel filter, fuel primer, expansion chamber, and alternator.
Before starting the engine read the engine manufacturer’s owner’s manual for proper break-in and
operating procedures. Once the engine is running, inspect it for any discrepancies, like oil leaking,
excessive water leaks, or anything out of the ordinary.
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Engine Control Panel: is mounted aft of the port side of the helmsman’s cockpit. It contains the
starter, kill switch, warning lights, and gauges. The combination throttle/gearshift are mounted on
the steering pedestal. Double-check all mechanical connections between engine and on-deck
equipment.
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Engine Bed: is constructed of heavily reinforced fiberglass. This provides a superior mount over
wood and is also rot-proof. The engine sits on Yanmar “soft” rubber shock mounts to help isolate
the engine vibration from the boat. Check to see that the engine is sitting correctly on them and
the bolts tightly secured.
Sail Drive
The J/109 is equipped with the Yanmar Saildrive SD-20. This system provides a clean quiet alternative
to conventional yacht drive trains. We recommend that you follow all Yanmar guidelines included with
the boat for maintenance and service of this system.
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Transmission: is attached to the aft end of the engine and houses the reduction and reverse
gears. These gears generally need little maintenance, but the oil level should be checked
periodically.
Fuel System
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Fuel Tank & Hoses: The J/109 is equipped with one 23 gallon fuel tank located under the port aft
cabin berth. Fuel lines run from the tank to the fuel primer pump. From there fuel flows into the
injectors on the engine. The tank itself is aluminum and baffled to prevent fuel slosh. For a layout,
please see the Fuel System diagram.
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Fuel Gauge: is located on the forward face of the engine panel recess in the cockpit. The gauge
reflects level (height) of fuel in the primary tank, not the quantity. Try to maintain a minimum level
of 1/3 to 1/2 tank filled at all times.
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Fuel Line Shut-Off Valve: also sits atop the tank at its forward end. Since diesel engines require
bleeding after they have been deprived of fuel, it’s important that the shut-off valve be in the “ON”
position (lever parallel to piping) anytime the engine is started.
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Fuel Tank Access Plate: is atop the fuel tank and provides access inside to clean the tank or
check the fuel gauge.