Changing; Battery; Multiple Efi Engine Battery Precautions; Cleaning The Flame Arrestor - Mercury MerCruiser Axius 350 MAG User Manual

Tube Ref No.
Power Trim and Steering
114
Fluid
3. Install the cap.

Changing

Power trim fluid does not require changing unless it becomes contaminated with water or debris. Contact your authorized Mercury
MerCruiser dealer.

Battery

Refer to specific instructions and warnings accompanying your battery. If this information is not available, observe the following
precautions when handling a battery.
Recharging a weak battery in the boat, or using jumper cables and a booster battery to start the engine, can cause serious injury
or product damage from fire or explosion. Remove the battery from the boat and recharge in a ventilated area away from sparks
or flames.
An operating or charging battery produces gas that can ignite and explode, spraying out sulfuric acid, which can cause severe
burns. Ventilate the area around the battery and wear protective equipment when handling or servicing batteries.

Multiple EFI Engine Battery Precautions

Alternators: Alternators are designed to charge the battery that supplies electrical power to the engine that the alternator is
mounted on. When batteries for 2 different engines are connected, one alternator will supply all of the charging current for both
batteries. Normally, the other engine's alternator will not be required to supply any charging current.
EFI Electronic Control Module (ECM): The ECM requires a stable voltage source. During multiple engine operation, an onboard
electrical device may cause a sudden drain of voltage at the engine's battery. The voltage may go below the ECM's minimum
required voltage. Also, the alternator on the other engine may now start charging. This could cause a voltage spike in the engine's
electrical system.
In either case, the ECM could shut off. When the voltage returns to the range that the ECM requires, the ECM will reset itself, and
the engine will operate normally. The ECM shuts off and resets itself so quickly that the engine may only seem to have an ignition
miss.
Batteries: Boats with multi‑engine EFI power packages require each engine be connected to its own battery. This ensures that
the engine's ECM has a stable voltage source.
Battery Switches: Battery switches should always be positioned so each engine is operating off of its own battery. Do not operate
engines with switches in both or all position. In an emergency, another engine's battery can be used to start an engine with a dead

battery.

Battery Isolators: Isolators can be used to charge an auxiliary battery used for powering accessories in the boat. They should
not be used to charge the battery of another engine in the boat unless the type of isolator is specifically designed for this purpose.
Generators: The generators battery should be considered another engine's battery.

Cleaning the Flame Arrestor

Fuel is flammable and explosive. Ensure the key switch is off and the lanyard is positioned so that the engine cannot start. Do
not smoke or allow sources of spark or open flame in the area while servicing. Keep the work area well ventilated and avoid
prolonged exposure to vapors. Always check for leaks before attempting to start the engine and wipe up any spilled fuel
immediately.
1. Remove the engine cover.
2. Disconnect and remove the crankcase ventilation hose from the fitting on the flame arrestor and valve cover.
90-864197084 NOVEMBER 2008
Description
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Where Used
Power trim pump
WARNING
WARNING
WARNING
Section 5 - Maintenance
Part No.
92-858074K01
Page 95