Auxiliary Hot Water Heater
Installation
Recommended Supply Locations
IMPORTANT: When connecting a cabin heater or
hot water heater, certain requirements must be
met.
•
Supply hose (from engine to heater) and re-
turn hose (from heater to engine) MUST NOT
EXCEED 5/8 in. (15.8 mm) I.D. (inside diame-
ter).
•
Engine with a Closed Cooling System: Heater
MUST BE LOWER than fill cap on the heat ex-
changer. If the heater is higher than the fill cap
on the heat exchanger and some coolant is
lost in the system, an air pocket may form in
the closed cooling system. This, in turn, can
cause the engine to overheat.
b
71518
•
Make heater connections ONLY at locations
described in the following instructions.
a
•
Check complete system for leaks after heater
is connected into cooling system.
•
Check for overheating condition (of engine)
after heater is connected.
1.
2.
Refer to “Changing Coolant - Draining Instruc-
tions”; drain closed cooling system.
Inspect for appropriate location of supply hose at
following:
72702
!
CAUTION
Thermostat Housing With Two Hose Connection
Avoid a performance loss and/or possible engine
damage. Engine coolant must flow continuously
from the engine intake manifold to the engine wa-
ter circulating pump. NEVER close-off or block
the coolant flow to or from a heater.
a - Audio Warning Switch Relocation
b - Water Supply Location
All heater installations must be plumbed in se-
ries with the supply and return connections.
NOTE: Hot water heater supply hose can be con-
nected at several different locations. On some mod-
els, there may be other accessories and options that
are utilizing these hot water supply locations. One of
the following should be available for use when install-
ing a hot water heater system.
b
a
NOTE: On some models it may be necessary to re-
move the audio warning heat switch from port side of
thermostat housing and reposition to water circulat-
ing pump opening as outlined following.
75045
MIE 7.4L / MCM 7.4LX Throttle Body Injection
IMPORTANT: Do not reposition engine tempera-
ture switch; it must remain where installed by
factory.
a - Location For Hot Water Supply
b - Factory Hose
Index
90-823324--2 796
CLOSED COOLING SYSTEMS - 6B-17
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
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