Flushing The Cooling System; Storage; Fuel System - Mercury 30 Service Manual

Flushing The Cooling
System
WARNING
To avoid possible injury when flushing, remove
the propeller. Refer to Propeller Replacement.
1. Remove propeller (refer to Propeller Replace-
ment). Install the flushing attachment so the rub-
ber cups fit tightly over the cooling water intake
holes.
2. Attach a water hose to the flushing attachment.
Turn on the water and adjust the flow so water is
leaking around the rubber cups to ensure the en-
gine receives an adequate supply of cooling wa-
ter.
3. Start the engine and run it at idle speed in neutral
shift position.
4. Adjust water flow (if necessary) so excess water
continues leaking out from around the rubber
cups to ensure the engine is receiving an ade-
quate supply of cooling water.
1B-10 - IMPORTANT INFORMATION
5. Check for a steady stream of water flowing out of
the water pump indicator hole. Continue flushing
the outboard for 3 to 5 minutes, carefully monitor-
ing water supply at all times.
6. Stop the engine, turn off the water, and remove
the flushing attachment. Reinstall the propeller.

Storage

The major consideration in preparing your outboard
for storage is to protect it from rust, corrosion, and
damage caused by freezing of trapped water.
The following storage procedures should be followed
to prepare your outboard for out-of-season storage
or prolonged storage (two months or longer).
CAUTION
Never start or run your outboard (even momen-
tarily) without water circulating through all the
cooling water intake holes in the gear case to pre-
vent damage to the water pump (running dry) or
overheating of the engine.

Fuel System

IMPORTANT: Gasoline containing alcohol (etha-
nol or methanol) can cause a formation of acid
during storage and can damage the fuel system.
If the gasoline being use contains alcohol, it is
advisable to drain as much of the remaining gas-
oline as possible from the fuel tank, remote fuel
line, and engine fuel system.
Fill the fuel system (tank, hoses, fuel pump and car-
buretors) with treated (stabilized) fuel to help prevent
formation of varnish and gum. Proceed with following
instructions.
90-826148R2 MARCH 1997