CLOSED COOLING
SERVICE MANUAL NUMBER 30
Filling Closed Cooling System
CAUTION
Alcohol or Methanol base antifreeze or plain water are not recommended for use in
coolant section of Closed Cooling System at any time.
It is recommended that the coolant section of Closed Cooling System be filled with a 50/50
mixture of Extended Life 5/100 Coolant and pure, soft water. This coolant MUST BE used
regardless of whether freezing temperatures are expected to provide adequate corrosion
protection. In areas where Extended Life 5/100 Coolant is not available and the possibility
of freezing DOES NOT exist, it is permissible to use a solution of rust inhibitor and pure, soft
water (mixed to manufacturer’s recommendations).
NOTE: Coolant section capacity is approximately 19 U.S. Quarts (18 l).
1.
Remove pressure cap from coolant reservoir.
CAUTION
DO NOT operate engine without water flowing through seawater pickup pump, as
pump impeller may be damaged and subsequent overheating damage to engine or
sterndrive unit may result.
CAUTION
Front of engine should be higher than rear to purge trapped air out of the system
during initial filling. This will minimize the possibility of air being trapped in the
closed cooling section which can cause engine to overheat.
IMPORTANT: This closed cooling system flows coolant at a high rate. Higher idle
speeds increase dispersion of trapped air into system making it more difficult to
purge trapped air. Operate at idle during filling and air purging when specified.
2.
3.
4.
Fill reservoir to the FULL mark with recommended coolant solution.
Replace pressure cap.
With engine running, check hose connections, fittings and gaskets for leaks. Also
observe engine temperature gauge to make sure that engine operating temperature is
normal. If gauge indicates excessive temperature, stop engine immediately and
determine cause.
WARNING
Allow engine to cool down before removing pressure cap. Sudden loss of pressure
could cause hot coolant to boil and discharge violently. After engine has cooled
down, turn cap 1/4-turn to allow any pressure to escape slowly, then push down and
turn cap all the way off.
5.
Recheck coolant level after first boat test and add coolant, if necessary.
6.
Maintain coolant level in reservoir at or near the FULL mark with engine at normal oper-
ating temperature.
INDEX
Page 6A-16
90-863161 SEPTEMBER 2000
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 496 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 |
(2 votes, average: 4 out of 4)
Marine readers have rated Mercury MerCruiser 496 CID 8.1L Gasoline Marine Engines Service Manual Number 30 4.0 out of 4.0 based on 2 product reviews. How many openings for crankcaseventilation is there on
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Great down load . it was all there an more