SERVICE MANUAL NUMBER 30
CLOSED COOLING
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 remove cap.
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 Extended Life 5/100 Coolant or an ethylene glycol
antifreeze and water solution properly mixed to protect engine to lowest temperature
to which it will be exposed.
IMPORTANT: Observe precautions previously outlined before proceeding.
1.
2.
Remove pressure cap from coolant reservoir.
Remove both hex head drain plugs located approximately 6 inches (152 mm) behind
the engine mounts.
3.
4.
5.
6.
Drain coolant into a suitable container.
After coolant has drained completely, reinstall drain plugs. Tighten securely.
Clean closed cooling system.
Fill closed cooling system.
Cleaning Closed Cooling System
Closed cooling section of closed cooling system should be cleaned at least once every five
years or whenever decreased cooling efficiency is experienced.
A good grade automotive cooling system cleaning solution may be used to remove rust,
scale or other foreign material. Always follow manufacturer’s instructions for the cleaner.
If closed cooling section is extremely dirty, a pressure flushing device may be used to flush
out remaining deposits. Flushing should be done in direction opposite normal coolant flow
to allow water to get behind deposits and force them out. Refer to instructions which accom-
pany flushing device for proper hookup and flushing procedure.
NOTICE
For information and procedures for draining and flushing Seawater Section of
Closed Cooling (Coolant) Models, refer to SECTION 1B. For cold weather or
extended storage, refer to SECTION 1B.
INDEX
90-863161
SEPTEMBER 2000
Page 6A-15
| 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 |
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