SEAWATER COOLED MODELS
SERVICE MANUAL NUMBER 26
CAUTION
Seawater section of cooling system MUST BE COMPLETELY drained for winter
storage, or immediately after cold weather use, if the possibility of freezing temper-
atures exists. Failure to comply may result in trapped water causing freeze and/or
corrosion damage to engine.
CAUTION
If boat is in the water, seacock (water inlet valve), if equipped, must be closed until
engine is to be re-started, to prevent water from flowing back into cooling system
and/or boat. If boat is not fitted with a seacock, water inlet hose must be discon-
nected and plugged to prevent water from flowing back into cooling system and/or
boat. As a precautionary measure, attach a tag to the ignition switch or steering
wheel of the boat with the warning that the seacock must be opened or the water
inlet hose reconnected prior to starting engine.
IMPORTANT: Observe the following information to ensure complete draining of
cooling system:
•
•
Engine must be as level as possible.
A wire should be repeatedly inserted into all drain holes to ensure there are no
obstructions in passages. Remove petcock, if necessary, to insert wire complete-
ly into drain hole.
IMPORTANT: To prevent threads in manifolds, elbows and cylinder blocks from
rusting out during storage, reinstall plugs using Quicksilver Perfect Seal on threads.
Never leave drain plugs out during storage.
NOTE: If possible, place a container under drains and hoses to prevent water from draining
into boat.
CAUTION
Cooling system must be completely drained for storage, or trapped water may
cause freeze and/or corrosion damage to engine.
Draining Instructions
SINGLE POINT DRAIN SYSTEM
Some models are equipped with a single point drain system consisting of 2 hoses with hard-
ware and a T-handle retrieval tool (shown below). This system drains the seawater section
of the engine only.
a
b
76242
a - T-handle Retrieval Tool
b - Hoses
Index
Page 6A-8
90-861329--1 MARCH 1999
| 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)
Marine readers have rated Mercury MerCruiser GM 4 Cylinder 181 cid 3.0L Marine Engines Service Manual Number 26 5.0 out of 5.0 based on 6 product reviews. Thanks for sharing this material. Helps a lot after suffering with bad mechanics. spend too much money and nothing very good
great manual, makes impossible jobs possible. without a manual you can not do the job, a must have.
Great resource. Excellent information provided.
Need help to install automate choke
Need help to instal automate choke