Specifications

J/46 OWNER GUIDE 31
General Hints To Avoid Problems
• Monitor brightness of cabin lighting and charge batteries as required by running engine. Batteries are
charged by either the AC battery charger or by running the engine.
NEVER START THE ENGINE WITH SHORE POWER CONNECTED
• Stop engine with throttle fuel cut-off, then turn ignition key “off”.
• NEVER turn engine battery switch to OFF position while engine is running.
• For best efficiency and fuel economy a cruising R.P.M. of 2,600 -2,800 works well. Vary RPM levels
periodically when cruising under power for a long distance. Be sure to thoroughly read and follow the
manufacturer’s manual for proper break-in procedure for the standard turbo charged Yanmar Diesel
engine. Remember, that a turbo engine is designed to run at higher RPMs (over 2,000) and not to be
used at idle speeds for long periods of time, which will soot up the turbo. When not underway, battery
charging and refrigeration cooling should be handled via shorepower or an auxiliary generator.
• Do not run engine at full throttle (3600 RPM) for sustained periods, as breakdown may occur. Most
importantly, find an RPM that runs smoothly and follow the Yanmar guide. Avoid "vibrating" RPM
speeds when possible.
• Mark the shaft at the coupling where blades are vertically aligned causing least resistance when motor
is stopped and in neutral. Turn shaft by hand to “feather” prop then lock by putting gear shift in
“REVERSE”.
• Keep engine gear shift lever in "REVERSE" position while sailing to prevent possible "free-wheeling" of
shaft.
• CAUTION: The J/46 engine is very quiet, and it is possible to forget that it is running. Before shifting
the gear shift lever into REVERSE when sailing, double check that the engine is turned off.
Engine Safety Precautions
Due to high temperatures it is recommended that after running the diesel for more than two hours you
reduce speed to idle and allow excess heat to dissipate for five to ten minutes.
The most common cause of trouble is contaminated or dirty fuel. Your boat is equipped with a dual
primary fuel filter located in the engine compartment and a secondary filter on the engine. The wise
skipper carries replacement filter cartridges. The dual filter is designed so that one filter is in operation
while the other is a spare. This way you can switch the fuel flow through the spare filter, if you need to
change out the first one.
Familiarize yourself with the bleeding procedure for the engine and try bleeding it yourself. The procedure
only takes a few minutes after you are acquainted with it, but can be exasperating to the uninitiated.
Starting The Engine
• If installed, turn VHF, GPS and Instruments "OFF."
• Transmission lever:
FORWARD= PushForward