MJM Yachts 36z Express - Manual (Page 16)

3.2
3.3
3.4
PROPULSION SYSTEM
If you get a high water temperature alarm, most likely the raw water strainer has become clogged.
Check to be sure it’s clean first. Best to check the coolant level before embarking on your journey
by opening the caps on top of the engine. Coolant should be visible (reach it with you finger when
the engine isn’t hot) of the reservoir which is on top of the front starboard corner of the engines.
Do not attempt to remove the coolant cap of a hot engine.
For details on what type of coolant to use it is very important to, consult the Yanmar operator
manual. As the water and exhaust exit out the hub of the props, it is not as easy to check raw
water flow. It is recommended to pay close attention to water temperature (167°-180° F is
normal) at the outset. It’s a good idea to have a container of spare coolant aboard at all times.
NEW ENGINE BREAK-IN
While running the engine for the first time and after shut-down, check for
proper engine oil pressure, diesel fuel leaks, engine oil leaks, coolant leaks, proper operation of
the indicators and gauges, proper exhaust color, engine vibrations and sounds, If coolant or oil
temperature is high (a) Is the raw water intake seacock open at the base of the IPS drives? (b)
Are the raw water strainers clogged?
The engine may seize if it is operated when seawater intake is restricted or if
load is applied without allowing the water temperature (engine) to warm up.
During the first 10 hours of operation, full load should only be applied for short periods. Never run
the engine for a long period at a constant RPM during this period. Higher oil consumption is
typical at this time, so carefully observe oil pressure, oil temperature and coolant temperature,
exhaust color and check engine oil and coolant levels frequently... ie daily.
LUBRICATION
Both the engine and sterndrive gears use oil for lubrication. The gears will tend to use less oil
than the engine, but both should be checked frequently. For the proper type of oils to use (which
may depend on the service area and conditions) consult the engine manual.
The engine oil may be checked on the starboard side of the engines by pulling up the red
dipsticks, at least ! hour after running of the engines to allow the oil to drain down from the upper
part of the engine.
The gear oil levels can be seen in the reservoirs on the transom.
ZINCS
Read the Yanmar Operators Manual carefully. In addition to a transom zinc, there are zincs
on the sterndrive and engine. Pay close attention to these zincs, inspecting them with a diver at
least monthly…a good frequency for cleaning the bottom of optimum performance as well. You’ll
find that the timing for replacing zincs varies depending on the type of bottom paint used, the
characteristics of the seawater, the amount of electrical current in marinas, or could indicate (if
excessive wear is noted) an electrical short on the boat, etc. Inspect engine zincs periodically at
the time of oil changes and remove the corroded area on the surface, replacing them when
deteriorated to less than 50% of original size. Otherwise corrosion in the cooling system will occur
and water leakage or parts breakage will result. Be sure to close raw water intakes at before
removing a plug to replace a zinc.
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