Battery Cables; M Ultiple E Ngine B Attery P Recautions; Alternator Belt Tension; S Ea W Ater P Ump I Mpeller R - Marine Power 4.3 VORTEC MPI Owner's Manual

DANGER
10.
Engine Maintenance

Battery Cables

WARNING
Do not recharge a weak battery in a boat. Remove
and recharge in a ventilated area away from fuel
vapors, sparks or fames. Electrical systems in a
CAUTION
marine environment require periodic attention.
Continued use of a weak battery or dirty terminals
can cause solenoid or starter problems. Clean battery
and terminals every 100 hours. Note the condition
of your battery cables. When reconnecting battery
cables make sure that the RED cable is on the (+)
terminal and the BLACK cable is on the (-) terminal.
Black is ground.
Multiple Engine
Battery Precautions - EFI
The alternator is designed to charge the battery that
supplies electrical power to the engine. When batteries
for two separate engines are connected, one alternator
will supply all the charging current for both batteries.
In normal instances, the other engine's alternator will
not be required to supply any charging current. The
Electronic Control Module (ECM) requires a steady,
stable voltage source. In multiple engine operation,
an electrical onboard device may cause a sudden drain
of voltage at the engine's battery. The voltage may go
below the ECM's minimum required voltage of nine (9)
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volts and the idle alternator on the other engine may
now start charging. This could cause a voltage "spike"
in the engine's electrical system. In these cases, the
ECM could shut off. When the voltage returns to the
required range, the ECM will reset itself. The engine
should begin to run normally. However, this ECM shut
down occurs so rapidly that the engine just appears
to have an ignition miss. In multi-EFI power packages,
each engine must be connected to its own battery. This
provides the required voltage source for the ECM. In
these applications where battery switches are used,
it is important that each switch be positioned to allow
each engine to run off its own individual battery. DO
NOT run engines with the battery switches in "BOTH"
DANGER
or "ALL" positions. This will allow the other engine's
battery to be used in case of emergency to start the
engine with the dead battery.

Alternator Belt Tension

WARNING
Make sure ignition key is removed and engine is not
running before inspecting belts.
4.3/5.7L Engines: Check V-belt tension by pressing
CAUTION
down on belt midway between the alternator pulley and
the circulating pump pulley. The belt should depress
one-quarter inch. If belt depresses more than one-half
inch, loosen alternator tension arm screw and adjust
tension by pivoting alternator. When correct tension is
achieved, tighten alternator tension arm screw.
6.0/6.2L Engines: Serpentine belt system maintains
tension with a spring-loaded tensioner. Normally, no
maintenance is required.
Sea Water Pump Impeller Replacement
Remove 4 screws from pump cover.
Remove cover and gasket.
Pry out impeller using a flat screw driver on each side of
the center of the shaft.
Install new impeller.
Replace gasket, cover and re-tighten screws.
Exploded View of
Sea Water Pump
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