Engine Break-In Procedure; Starting The Engine - Tiller Handle Models - Mercury 15 FourStroke Manual

Without sufficient cooling water, the engine, the water pump,
and other components will overheat and suffer damage.
Provide a sufficient supply of water to the water inlets during
operation.
3. Make sure the cooling water intake is submerged.
Engine Break‑in Procedure
IMPORTANT: Failure to follow the engine break‑in procedures can
result in poor performance throughout the life of the engine and
can cause engine damage. Always follow break‑in procedures.
1. For the first hour of operation, run the engine at varied throttle
settings up to 2000 RPM or at approximately half throttle.
2. For the second hour of operation, run the engine at varied
throttle settings up to 3000 RPM or at three‑quarter throttle,
and at full throttle for approximately one minute every ten
minutes.
3. For the next eight hours of operation, avoid continuous
operation at full throttle for more than five minutes at a time.
Starting the Engine ‑ Tiller Handle Models
Before starting, read the pre‑starting check list, special operating
instructions, and engine break‑in procedure in the Operation
section.
1. Open the fuel tank vent screw on manual venting type tanks.
OPERATION
NOTICE
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