Installation Instructions; E Xhaust P Iping - Marine Power 4.3 VORTEC MPI Owner's Manual

13.

Installation Instructions

through hull inlet scoop must be used. In that case, the
through-hull fitting and sea cock should be placed as
close to the engine as possible and be one size larger
than the water pump inlet. The water pump inlet scoop
should face the bow of the boat in an area where there
are no obstructions. Obstructions could cause water
turbulence and prevent a solid stream of water from
entering the sea scoop. Regardless of the supply (stern
drive or inlet scoop) the coolant water inlet hose must
be of a non-collapsing type. If a through hull inlet scoop
is used, it is highly recommended that a sea strainer
of adequate size and capacity be installed between the
sea cock and engine sea water pump. If no sea strainer
is installed, periodically check the cooling inlet piping
and hose to clear debris from engine and transmission
oil coolers. Debris entering the cooling system is one of
the main causes of overheating.
The ABYC and other industry standards require the use
of a seacock on certain types of applications to stop
the entry of water in the event of a leak in the cooling
system. The seacock must provide a minimum restric-
tion to water flow. A 90 degree ball valve with a lever
quarter turn handle is the most commonly used type.
SPORTPACS AND TOWPACS use thru-hull fittings to
supply cooling water to the sea water pump.
42
Emission-Related
Installation Instructions
Failing to follow these instructions when installing a
certified engine in a vessel violates federal law (40CFR
1068.105(b)) and is subject to fines or other penalties
as described in the Clean Air Act. The installer and/or
vessel manufacturer must meet the evaporative
emission requirements of 40 CFR part 1060 and CFR
1045.112.
Any manufacturer installing a high performance engine
must use enhanced evaporative control systems on any
boat that is manufactured for sale, sold, or offered for
sale in California, or that is introduced, delivered or
imported into California for introduction into commerce.
Enhanced evaporative control system has designed the
system components to meet or exceed the diurnal and
permeation design specifications listed in the following
table throughout the useful life of the engine.
PERMEATION DIURNAL
STANDARDS STANDARDS
[grams per sq. meter [grams per gal.
per day] per day]
Fuel Hoses 15.0 — 23 ± 2
Fuel Tank 1.5 — 28 ± 2
Trailerable Boat 0.40
Non-trailerable Boat 0.16
DO NOT operate engine without water being
supplied to raw water pump as damage to the
impeller and engine will result.
Exhaust Piping
IMPORTANT: The boat manufacturer or installing
dealer (or individual) is responsible for properly locating
the engine and installing the exhaust system. Improp-
er installation may allow water to enter the exhaust
manifolds and engine cylinders and severely damage
the engine. Damage caused by water in the engine
will not be covered by the Marine Power warranty,
unless this damage is a result of defective parts or
workmanship by Marine Power.
ENPACS, SPORTPACS, JETPACS AND TOWPACS
are equipped with a wet exhaust system in which
exhaust is mixed with water in the exhaust risers. This
TEST
water cools the exhaust and allows the use of heat
TEMP
resistant rubber hose on the riser outlets. Follow these
[degrees Celsius]
general guidelines when designing and installing the
exhaust system.
Use heat resistant hose that complies with specifica-
tions SAE J2006 or UL 1129 (ABYC standard). Exhaust
25.6 – 32.2
hoses should be 4" on dual outlet systems. 6.2L and
27.6 – 30.2
larger engines should use 5" on single outlet systems.
WARNING
CAUTION
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