Battery; Battery Precautions For Multiple Engines - Mercury 2.8 Diesel Operation & Maintenance Manual

Section 4 - Maintenance
6. Use the adjustment screw to move the power‑assisted steering pump to tension the power‑assisted steering belt.
b
Power‑assisted steering drive belt tension
Belt deflection, with moderate hand pressure
7. Torque the power‑assisted steering pump mounting and tensioning bolts.
Description
Power‑assisted steering pump mounting and tensioning flange bolt
8.
Install the serpentine belt. See Serpentine Belt.

Battery

Refer to the 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.

Battery Precautions for Multiple Engines

Alternators: Alternators are designed to charge a single battery that supplies electrical power to the individual engine on which
the alternator is mounted. Connect only one battery to one alternator. Do not connect two batteries to the same alternator
unless a battery isolator is used.
Engine 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.
Page 94
a a
2.8 shown, 4.2 similar
a - Mounting bolts
a a
23767
WARNING
!
WARNING
!
a - Mounting bolts
b - Adjustment screw
23650
Nm
21
90-8M0113987
5 mm (3/16 in.)
lb. in. lb. ft.
15
DECEMBER 2015
eng