Section 4 - Maintenance
90-8M0113925 eng DECEMBER 2015 Page 41
!
CAUTION
A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting in serious injury from burns. Allow
the engine to cool down before removing the coolant pressure cap.
IMPORTANT: When filling the coolant section after it has been completely drained, the engine should be level or slightly lower
at the flywheel end.
1. Remove the pressure cap from the coolant reservoir.
2. Fill the reservoir to the full mark with the recommended coolant solution.
3. When refilling the coolant section after it has been completely drained, fill the reservoir to within 12 mm (0.50 in.) of the top
of the reservoir neck before starting the engine.
4. Replace the pressure cap.
NOTICE
Without sufficient cooling water, the engine, the water pump, and other components will overheat and suffer damage. Provide
a sufficient supply of water to the water inlets during operation.
5. Supply cooling water to the engine.
6. With the engine running, check the hose connections, fittings, and gaskets for leaks. Also observe the engine temperature
gauge to ensure that the engine operating temperature is normal. If the gauge indicates excessive temperature, stop the
engine immediately and determine the cause.
!
CAUTION
A sudden loss of pressure can cause hot coolant to boil and discharge violently resulting in serious injury from burns. Allow
the engine to cool down before removing the coolant pressure cap.
7. After the engine has cooled completely, recheck the coolant level and add coolant, if necessary.
8. If the reservoir was completely emptied of coolant, a significant amount of air remains in the cooling system. Refill the
reservoir to the "FULL" mark, repeat the warm‑up/cool‑down cycle, and check the coolant level again.
9. Maintain the coolant level in the reservoir at or near the "FULL" mark with the engine cold.
Draining
Contact your authorized Mercury MerCruiser dealer.
Cleaning
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.
!
WARNING
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.
!
WARNING
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 two 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 ECMs
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.
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