MJM Yachts 40z Express - Manual (Page 15)

CHAPTER 3
3.2
Your engine passes seawater (raw water) through an intake in the IPS drive unit under the hull
through a heat exchanger where it cools the engine’s coolant. This coolant is circulated through
the engine and returns to the heat exchanger. For the engine to keep cool, it must have an
adequate supply of raw water and coolant. Periodically check to be sure it’s clean and check the
coolant level by opening the caps on top of the engine. Coolant should be close to the top of the
reservoir on top of the front port 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, consult the engine operator’s manual or the
maintenance schedule included in this manual. As the water and exhaust exit out the back of the
drives, it is not as easy to check raw water flow. It is recommended to pay close attention to water
temperature (167°-194° F is normal) at the outset.
3.3
Both the engine and transmission use oil for lubrication. The
transmission 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 manufacturer’s operator’s manual.
The engine oil may be checked between 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 transmission dipstick is red and unscrews. It is difficult to
find and reach as one must get down between engines aft,
move aft then reach behind the IPS drives to unscrew these
caps. A small price to pay perhaps for the wonders of how
well the IPS operates.
Be sure not to overfill this reservoir as damage to the engine could result.
3.4
Read page 79 and pages 89-91 of the Volvo Operators
Manual (VOM) carefully. In addition to transom zincs, there
are two engine zincs plus an iron anode in the exhaust cavity
of the drive and care must be taken of the drive housing and
coating of the propulsion unit. The props and propulsion unit
have “PropSpeed” applied when delivered. Be sure to inspect
and recoat if there are any scratches or whenever the boat is
hauled. The timing for replacing zincs varies depending on
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 the engine
zinc 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-cooling
system will occur and water leakage or parts breakage will result. Be sure to close the raw water
intakes at the base of drives, before removing a plug to replace a zinc.
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COOLING
LUBRICATION (IPS 500 Drive Shown)
CORROSION PROTECTION
PROPULSION SYSTEM
Transmission Dipstick
(Hidden aft of IPS Drives)
RAW WATER INTAKE VALVE
Shown OPEN