EasyManuals Logo

Mercury 6 Service Manual

Mercury 6
149 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #33 background imageLoading...
Page #33 background image
GENERAL INFORMATION
Page 1C-4 90-827242R02 FEBRUARY 2003
CAVITATION
Cavitation is caused by water vapor bubbles forming either from a sharp edge or angle on
the gear case or from an irregularity in the propeller blade itself. These vapor bubbles flow
back and collapse when striking the surface of the propeller blade resulting in the erosion
of the propeller blade surface. If allowed to continue, eventual blade failure (breakage) will
occur.
Engine
DETONATION
Detonation in a 2-cycle engine resembles the pinging heard in an automobile engine. It can
be otherwise described as a tin-like rattling or plinking sound.
Detonation is an explosion of an unburned portion of the fuel/air charge after the spark plug
has fired. Detonation creates severe shock waves in the engine, and these shock waves
often find or create a weakness: The dome of a piston, cylinder head/gasket, piston rings
or piston ring lands, piston pin and roller bearings.
A few of the most common causes of detonation in a marine 2-cycle application are as
follows:
Over-advanced ignition timing.
Use of low octane gasoline.
Propeller pitch too high (engine RPM below recommended maximum range).
Lean fuel mixture at or near wide-open-throttle.
Spark plugs (heat range too hot - incorrect reach - cross-firing).
Inadequate engine cooling (deteriorated cooling system).
Combustion chamber/piston deposits (result in higher compression ratio).
Detonation usually can be prevented if:
1. The engine is correctly set up.
2. Diligent maintenance is applied to combat the detonation causes.
51115
Damaged Piston Resulting from Detonation

Other manuals for Mercury 6

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Mercury 6 and is the answer not in the manual?

Mercury 6 Specifications

General IconGeneral
Cylinders1
StartingManual
Displacement123 cc
Horsepower6 HP
Shaft Length15 inches (Short)
Gear ShiftForward, Neutral

Related product manuals