Page 116 - REPOWER REFERENCE GUIDE (2020)

Cooling System
• Inspect the condition of the thermostat housing and replace the thermostat and corresponding sleeves and gaskets. Refer
to Seawater‑Cooled Models—Thermostat Assembly for additional details.
• As part of a predelivery inspection, check that all clamps are tight and that there are no leaks during a sea trial.
NOTE: Additional cooling system requirements and specifications follow.
Seawater‑Cooled Models—Thermostat Assembly

Specifications

Seawater Cooling System Capacity
Engine Liter (U.S. Quart)
Seawater cooled models 20 L (21 US qt )
Thermostat

Engine Specification
Seawater cooled models 71 °C (160 °F)

7 Point Manual Drain Systems

Models Covered Serial Number Or Year
Carbureted MCM models 0M087348–0M599999
Carbureted MIE models 0L677227–0M316999
NOTE: A part number 860256C3 is located on the thermostat housing casting as an identifier.

a - Thermostat housing
b - Thermostat gasket
f c - Thermostat (stainless steel)
d - Thermostat sleeve
i e - Thermostat housing gasket

f - Temperature sensor
g - Air vent plug (draining seawater)
h - O‑ring
a i - Pipe plug (2)
h
b
g

c

d

e

30942
Testing

1. Remove the thermostat.
2. Place the thermostat on blocks in a container.

Page 4E-4 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018