Service manual

SEAWATER COOLED MODELS SERVICE MANUAL NUMBER 26
Page 6A-14 90-861329--1 MARCH 1999
Auxiliary Hot Water Heater Installation
When connecting a cabin heater or hot water heater to a MerCruiser engine, certain require-
ments must be met.
• Supply hose (from engine to heater) and return hose (from heater to engine) MUST NOT
EXCEED 5/8 in. (15.8 mm) I.D. (inside diameter).
• Make heater connections ONLY at locations described in the following instructions.
• Check complete system for leaks after heater is connected into cooling system.
• Check for overheating condition (of engine) after heater is connected.
An auxiliary hot water heater kit is not available from Mercury Marine for this model
MerCruiser engine. To connect a cabin heater or hot water heater to these engines, use the
following procedure:
1. Drain water from cooling system.
2. Remove plug for thermostat housing at location shown.
50628
a
b
Typical
a-Thermostat Housing
b-Plug
Index