CLOSED COOLED MODELS
SERVICE MANUAL NUMBER 24
3.
After coolant has drained completely, reinstall petcocks and hoses. Tighten clamps and
petcocks securely.
4.
5.
6.
Remove coolant recovery bottle from mounting bracket and pour out coolant.
Clean system as outlined in “Cleaning System.”
Fill system as outlined in “Filling Closed Cooling Section.”
Cleaning System
Closed Cooling Section
Closed cooling section of closed cooling system should be cleaned at least once every two
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 that
accompany flushing device for proper hookup and flushing procedure.
NOTICE
For information and procedures on draining and flushing Seawater Section of
Closed Cooling (Coolant) Models, refer to SECTION 1B. For cold weather or
extended storage, refer to SECTION 1B.
Seawater Section
Cooling efficiency of an engine with closed cooling is greatly dependent upon heat transfer
through the tubes within the heat exchanger. During engine operation, contaminants within
the seawater (such as salt, silt, lime, etc.) collect on the inside of the tubes, thus reducing
heat transfer and greatly decreasing heat exchanger efficiency. It is, therefore, recom-
mended that the seawater section of the heat exchanger be cleaned as specified in SEC-
TION 1B - “Scheduled Maintenance” or whenever decreased cooling efficiency is sus-
pected.
1.
2.
3.
Remove bolts securing end plates to heat exchanger.
Then remove end plates, seal washers and gaskets.
Discard seal washers and gaskets.
Index
Page 6B-14
90-861327--1 OCTOBER 1999
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 305 CID, Mercury MerCruiser 350 CID |
| Model Year | 1998, 1999, 2000, 2001 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
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