Mercury 25 EFI Service Manual page 3

Notice to Users of This Manual
Throughout this publication, warnings, cautions, and notices (accompanied by the International HAZARD Symbol
used to alert the mechanic to special instructions concerning a particular service or operation that may be hazardous if
performed incorrectly or carelessly. Observe them carefully!
These safety alerts alone cannot eliminate the hazards that they signal. Strict compliance to these special instructions when
performing the service, plus common sense operation, are major accident prevention measures.
Indicates a hazardous situation which, if not avoided, could result in death or serious injury.
Indicates a hazardous situation which, if not avoided, could result in minor or moderate injury.
Indicates a situation which, if not avoided, could result in engine or major component failure.
IMPORTANT: Identifies information essential to the successful completion of the task.
NOTE: Indicates information that helps in the understanding of a particular step or action.
This manual has been written and published by the Service Department of Mercury Marine to aid our dealers' mechanics and
company service personnel when servicing the products described herein. We reserve the right to make changes to this
manual without prior notification.
It is assumed that these personnel are familiar with marine product servicing procedures. Furthermore, it is assumed that they
have been trained in the recommended service procedures of Mercury Marine power products, including the use of mechanics'
common hand tools and the special Mercury Marine or recommended tools from other suppliers.
We could not possibly know of and advise the marine trade of all conceivable procedures and of the possible hazards and/or
results of each method. Therefore, when using a service procedure and/or tool that is not recommended by the manufacturer,
be completely satisfied that neither your personal or product safety is endangered.
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.
Avoid fire or explosion hazard. Electrical, ignition, and fuel system components on Mercury Marine products comply with
federal and international standards to minimize risk of fire or explosion. Do not use replacement electrical or fuel system
components that do not comply with these standards. When servicing the electrical and fuel systems, properly install and
tighten all components.
Page i
WARNING
!
CAUTION
!
NOTICE
WARNING
!
© 2016 Mercury Marine
!
90-8M0105568 eng MARCH 2016
) are