35
.ROUTINE SERVICE
COOLING SYSTEM
2
Running the Outboard Using a
Hose and Flushing Adapter
A flushing adapter may be used to provide cooling
water when running the outboard to:
• Flush the engine
• Run for a n extende d pe riod of time, such a s
when performing diagnostic work
• Run the engine on a dynamometer
• Prepare the outboard for storage.
IMPORTANT: The outbo ard mu st be lo cated in
a well ven tilated area with appropriate grou nd
drainage.
Keep water inlet pressure between 20 to 40 p si
(140 to 275 kPa).
Be sure water supply is sufficient to run the engine
above idle speed.
Water Supply Requirements
1. GPM: Gallons per minute
2. LPM: Liters per minute
Install flu shing adapter onto gearcase water inlet
screens.
Temporarily cover the s mall hole s
on the front of M2-Type gearcases with water-
proof tape to make sure enough water trave ls
to the po werhead. Water can drain from aux il-
iary inlets, resulting in engine overheat.
A st eady stre am of water should flo w f rom th e
overboard indicator while the engine is running.
Monitor engine water pressure gauge when:
• Engine speed is above 3000 RPM
• Running engine on a dynamometer.
Refer to SERVICE SPECIFICATIONS on p. 10 for
water pressure requirements.
Engine will overheat if normal water
pressure is not maintained. Temporarily install
an engin e water pre ssure gauge if not
equipped with one.
Be sure to remove wate rproof tape from auxiliary
water inlets.
Engine will ov erheat if auxi liary
water inlet s are restricte d whe n outboa rd is
back in service.
A WARNING
To prevent inju ry from cont act with rotat-
ing propeller, remove the propeller before
running engine with a flushing adapter.
Model Water Flow @ WOT
200–250 HP (3.3 L)
20 to 25 GPM
1
(75 to 94 LPM)
2
250–300 HP (3.4 L)
25 to 30 GPM
1
(94 to 113 LPM)
2
M2-Type Gearcase
1. Water-proof tape
2. Flushing adapter
008358
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