Engine Compartment; Engine Mounting; Nstallation Nstructions - Marine Power 4.3 VORTEC MPI Owner's Manual

13.
Installation Instructions
NOTE: Before shipment, each engine has been careful-
ly tested and inspected. It may be necessary to delete
or add oil from the engine and transmission for various
engine installations. If engine is equipped with a closed
cooling system, it is imperative to fill the system with a
50/50 mix of ethylene glycol base antifreeze and clean
fresh water. Failure to use a 50/50 mixture of antifreeze
and water can result in engine damage.
(See Section 3: Engine Identification)

Engine Compartment

The engine compartment should be well-planned giving
consideration to accessibility and ventilation. Engines
must have air as well as fuel to operate efficiently.
The battery should be located as close as possible to
the starter motor so that the battery leads can be kept
short. EFI engines equipped with the SMART START
option have a direct connection to the battery or battery
switch. See MEFI 5 engine to boat harness figure.

Engine Mounting

Engine installation is very important. If the angle is
severe (over 12 degrees) oil capacity may need to be
adjusted.
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Engine Rotation
Directional references used in this section are given as
if standing behind the boat, looking forward:
• Front of boat is bow
• Rear of boat is stern
• Right side is starboard
• Left side is port
The raw water (or Sea Water) pump is located at the
front of the engine on the crankshaft pulley. Engine
rotation can be determined by looking at the stern end
of the engine and observing the flywheel rotation. Do
not assume engine rotation by looking at the propeller
rotation; it may not be the same. This information is
critical when ordering parts for your engine.
Left Hand Engines: CCW or Normal Rotation
Right Hand Engines: CW or Opposite Rotation
Engine Bed
The engine bed should be of horizontal design and
heavily constructed to maintain engine alignment. All
of the thrust used in moving the boat is transferred to
the hull through the engine bed. The standard engine
has support mounts that are intended to be used on
engine beds arranged for 22½" - 24" bolt centers. Use
adequate bolts for each support. Make certain there is
no interference on the underside of the engine between
the oil pan or other components located in that area and
the hull.
Cooling System
Marine Power Engines may be equipped with
either a sea water cooling system or a closed cooling
system. These are sometimes referred to as a raw water
cooling system or a freshwater cooling system, respec-
tively. On sea water cooled engines, the engine is cooled
entirely by the water in which the boat is operating.
Closed cooled engines use a combination of freshwater
coolant (50% antifreeze + 50% water) and seawater for
cooling. Sea water systems operate at a temperature
of 142° - 160° F while the closed cooling system will
operate at 160° - 185° F. The system is monitored by
the water temperature gauge on the instrument panel
and, in the case of EFI, the Engine Control Module. On
EFI engines the ECM will activate the POWER REDUC-
TION MODE if the engine temperature reaches 210°
F. The POWER REDUCTION MODE reduces RPM to
approximately 2500. The cooling system must receive
a sufficient amount of sea water under all operating
conditions to operate properly. Cooling water may be
supplied from a stern drive unit or a through hull inlet
scoop. ENPACS mated with stern drives that have water
pumps in the drive leg can use the water supply from
the leg without using an impeller seawater pump. If the
ENPAC is equipped with Closed Cooling, a sea water
pump will be part of the engine configuration and a
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