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All information, illustrations, and specifications contained in this manual are based on the
latest product information available at the time of publication. As required, revisions to this
manual will be sent to all dealers contracted by us to sell and/or service these products.
Refer to dealer service bulletins, operation maintenance and warranty manuals, and
installation manuals for other pertinent information concerning the products described in
this manual.
Precautions
It should be kept in mind, while working on the product, that the electrical and ignition
systems are capable of violent and damaging short circuits or severe electrical shocks.
When performing any work where electrical terminals could possibly be grounded or
touched by the mechanic, the battery cables should be disconnected at the battery.
Any time the intake or exhaust openings are exposed during service they should be
covered to protect against accidental entrance of foreign material into the cylinders which
could cause extensive internal damage when the engine is started.
During any maintenance procedure, replacement fasteners must have the same
measurements and strength as those removed. Numbers on the heads of the metric bolts
and on the surfaces of metric nuts indicate their strength. American bolts use radial lines
for this purpose, while most American nuts do not have strength markings. Mismatched or
incorrect fasteners can result in damage or malfunction, or possibly personal injury.
Therefore, fasteners removed should be saved for reuse in the same locations whenever
possible. Where the fasteners are not satisfactory for reuse, care should be taken to select
a replacement that matches the original.
Replacement Parts
Use of parts other than the recommended service replacement parts will void the warranty
on those parts that are damaged as a result.
!
WARNING
Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on
Mercury Marine products comply with U.S. Coast Guard rules to minimize risk of fire or
explosion. Do not use replacement electrical or fuel system components that do not
comply with these rules. When servicing the electrical and fuel systems, properly install
and tighten all components.
Cleanliness and Care of Product
A Mercury Marine Power Product is a combination of many machined, honed, polished,
and lapped surfaces with tolerances measured in the ten thousands of an inch/mm. When
any product component is serviced, care and cleanliness are important. It should be
understood that proper cleaning and protection of machined surfaces and friction areas is
a part of the repair procedure. This is considered standard shop practice even if not
specifically stated.
Whenever components are removed for service, they should be retained in order. At the
time of installation, they should be installed in the same locations and with the same mating
surfaces as when removed.
Personnel should not work on or under an engine that is suspended. Engines should be
attached to work stands, or lowered to ground as soon as possible.
Summary of Contents for MerCruiser ECM 555
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