Checking The Cooling Water Pilot Hole; Test Run; Break-In - Yamaha 55DEHD Service Manual

GEN
INFO
4. Check that the engine turns off when the
engine stop lanyard is pulled from the
engine stop lanyard switch.
å
∫
å EHD
∫ ED, ET
Checking the cooling water pilot
hole
1. Start the engine, and then check for a
water flow from the cooling water pilot
hole.
1-17
General information
69D10215
69R11220
68810130

Test run

1. Start the engine, and then check that the
gear shift operates smoothly.
2. Check that the engine idle speed after
the engine has been warmed up.
3. Operate at trolling speed.
4. Run the outboard motor for 1 hour at
3,000 r/min or at half throttle, then for
another hour at 4,000 r/min or at 3/4
throttle.
5. Check that the outboard motor does not
tilt up when shifting into reverse and that
water does not flow in over the transom.
NOTE:
The test run is part of the break-in operation.

Break-in

During the test run, perform the break-in
operation in the following 5 stages.
1. 10 minutes a at the lowest possible
speed. A fast idle in neutral is best.
2. 50 minutes b at 1/2 throttle (approxi-
mately 3,000 r/min) or less. Vary engine
speed occasionally. On an easy-planing
boat, accelerate at full throttle onto plane,
then immediately reduce the throttle to
3,000 r/min or less.
3. 1 hour c at 3/4 throttle (approximately
4,000 r/min). Vary engine speed occa-
sionally. Run at full throttle for 1 minute,
then allow about 10 minutes of operation
at 3/4 throttle or less to let the engine
cool.
4. 8 hours d at any speed, but avoid oper-
ating at full throttle for more than 5 min-
utes at a time. Let the engine cool
between full-throttle runs. Vary engine
speed occasionally.
6885J11