SERVICE MANUAL NUMBER 26
CLOSED COOLED MODELS
CAUTION
Avoid seawater pickup pump impeller damage. DO NOT operate engine without
cooling water being supplied to seawater pickup pump.
5.
With boat in the water and/or cooling water properly supplied to seawater pickup pump,
start engine and inspect for leaks.
Changing Coolant
NOTICE
For information and procedures on “Draining The Seawater Cooling System,” and
“Cold Weather Or Extended Storage,” refer to SECTION 1B.
Closed Cooling Section
Closed cooling section of closed cooling system should be kept filled year-round with rec-
ommended coolant solution. Do not drain closed cooling section for storage, as this will pro-
mote rusting of internal surfaces. If engine will be exposed to freezing temperatures, make
sure that closed cooling section is filled with an ethylene glycol antifreeze and water solu-
tion, mixed to manufacturer’s recommended proportions, to protect engine to lowest tem-
perature to which it will be exposed. If necessary, change coolant.
Coolant Recommendations
CAUTION
Alcohol or Methanol base antifreeze or plain water are not recommended for use in
fresh water section of closed cooling system at any time.
MerCruiser recommends the use of Extended Life 5/100 Ethylene Glycol Antifreeze/Cool-
ant mixed 50/50 with purified water. If this is not available, use a 50/50 mixture of ethylene
glycol antifreeze and tap water. In areas where temperatures generally do not go below
32
° F (0° C), rust inhibitor and tap water is acceptable. Extended Life 5/100 Ethylene Gly-
col Antifreeze/Coolant should be changed every 5 years or 1,000 hours whichever occurs
first. Any other coolants should be changed every 2 years or 400 hours, whichever occurs
first.
Change Intervals
Drain and flush coolant from the closed cooling system at least every two years or whenever
exhaust gases have entered the system.
Draining Instructions
WARNING
Allow engine to cool before removing pressure cap. Sudden loss of pressure could
cause hot coolant to boil and discharge violently. After engine has cooled, turn cap
1/4
turn to allow any pressure to escape slowly, then push down and turn cap all the
way off.
IMPORTANT: Engine must be as level as possible to ensure complete draining of
cooling system.
IMPORTANT: Closed cooling section must be kept filled year round with recom-
mended coolant. If engine will be exposed to freezing temperatures, make sure
closed cooling section is filled with an ethylene glycol antifreeze and water solution
properly mixed to protect engine to lowest temperature to which it will be exposed.
Index
90-861329--1
MARCH 1999
Page 6B-11
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 181 CID |
| Model Year | 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(6 votes, average: 5 out of 5)
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Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke