Engine Break-In Procedure; Starting The Engine - Mercury 150 Manual

Engine Break-in Procedure

Severe damage to the engine can result by not complying with the Engine Break-in Procedure.
GASOLINE/OIL BREAK-IN MIXTURE
Do not use pre-mixed gas and oil during break-in. Oil from the oil injection system will supply adequate
lubrication during engine break-in.
BREAK-IN PROCEDURE
1. For the first hour of operation, allow the engine to warm up for 30-60 seconds.
a. Run the engine at varied throttle settings, the majority of the time between 3000 and 4500
RPM or three-quarter throttle.
b. Change engine speed approximately every two minutes, and avoid continuous operation at
idle speed for more than ten minutes. Short bursts of full throttle for periods up to ten seconds
are acceptable.
c. Avoid trimming the outboard out (up) beyond a vertical trim position during operation.
NOTE: It is the driver's responsibility to always drive in a safe manner. Improper trim angle of the
outboard when driving at the proper speed can be difficult and dangerous. The purpose of specifying
trim angle is to help guide the operator in determining how to put the proper load on the engine.
2. For the next three hours of operation, change engine speed every ten minutes.

Starting The Engine

Before starting, read the Pre-Starting Check List, Special Operating Instructions, and Engine Break-in
Procedure in the Operation Section.
Never start or operate your outboard (even momentarily) without water circulating through all the
cooling water intake holes in the gearcase to prevent damage to the water pump (running dry) or
overheating of the engine.
1. Lower the outboard to the vertical operating position. Make sure all cooling water intake holes are
submerged.
2. Open fuel tank vent screw (in filler cap) on manual venting type fuel tanks.
OPERATION
CAUTION
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CAUTION
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