GASOLINE STERNDRIVE INSTALLATION MANUAL
90-860172011
Page 117 of 137
CLEARING CLOGGED BLUE DRAIN HOSES
Boat In Water
CAUTION
Allow engine to cool down before disconnecting blue drain hoses. Engine water
temperature can exceed 160
°
F (71
°
C).
CAUTION
Ensure bilge pump is operating before beginning procedures. Excess water in bilge
can damage engine or cause boat to sink.
1. Reconnect the UNCLOGGED blue drain hose to the bracket.
2. Ensure CLOGGED blue drain hose is in correct position below its connection point to
the block.
3. Turn on bilge pump.
4. Start engine. Allow it to run at idle until the obstruction is cleared from the hose or for
approximately 1 minute, whichever occurs first.
5. Check for water draining from the blue drain hose. If after 1 minute of idling, the blue
drain hose is still clogged, go to Step 6. If water is draining, shut off engine and return
to Step 3 of “3.0L Single Point Drain.”
6. Shut off engine.
7. Attach the female end of the water hose adapter fitting to a water supply.
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8. Attach the CLOGGED blue drain hose to the male end on the water hose adapter fitting.
9. Fully open the water supply and allow it to run for 1 minute.
10. Turn off the water supply.
11. Disconnect the water hose adapter from the blue drain hose and the water hose.
12. Push down on T-handle to force the blue drain hoses down below their connection points
to the block.
13. Check for water draining from the blue drain hose. If blue drain hose is still clogged, shut
off the bilge pump and reattach the blue drain hoses following Steps 7 - 9 in
“3.0L Single
Point Drain.” The unit will need to be serviced by an authorized Mercury MerCruiser
dealer. If water is draining, return to Step 4 of “3.0L Single Point Drain.”
BOAT OUT OF WATER
Engine Not Running
1. Attach the water hose adapter fitting to a water supply.
2. Attach the clogged blue drain hose to the male end on the water hose adapter fitting.
3. Turn on bilge pump.
4. Fully open the water supply and allow it to run for 1 minute.
5. Turn off the water supply.
