Mercury 45 Jet 50-55 Service Manual page 2

Notice
Throughout this publication, "Dangers", "Warnings" and
"Cautions" (accompanied by the International HAZARD
Symbol ) are used to alert the mechanic to special in-
!
structions 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 instruc-
tions when performing the service, plus "Common Sense"
operation, are major accident prevention measures.
DANGER
!
DANGER - Immediate hazards which WILL result in se-
vere personal injury or death.
WARNING
!
WARNING - Hazards or unsafe practices which COULD
result in severe personal injury or death.
CAUTION
!
Hazards or unsafe practices which could result in mi-
nor personal injury or product or property damage.
Notice to Users of This
Manual
This service manual has been written and published by the
Service Department of Mercury Marine to aid our dealers'
mechanics and company service personnel when servic-
ing the products described herein.
It is assumed that these personnel are familiar with the
servicing procedures of these products, or like or similar
products manufactured and marketed by Mercury Marine,
that they have been trained in the recommended servicing
procedures of these products which includes the use of
mechanics' common hand tools and the special Mercury
Marine or recommended tools from other suppliers.
90-817643R1 DECEMBER 1996
We could not possibly know of and advise the service trade
of all conceivable procedures by which a service might be
performed and of the possible hazards and/or results of
each method. We have not undertaken any such wide eval-
uation. Therefore, anyone who uses a service procedure
and/or tool, which is not recommended by the manufactur-
er, first must completely satisfy himself that neither his nor
the products safety will be endangered by the service pro-
cedure selected.
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.
It should be kept in mind, while working on the product, that
the electrical system and ignition system are capable of vi-
olent and damaging short circuits or severe electrical
shocks. When performing any work where electrical termi-
nals could possibly be grounded or touched by the me-
chanic, the battery cables should be disconnected at the
battery.
Any time the intake or exhaust openings are exposed dur-
ing service they should be covered to protect against acci-
dental entrance of foreign material which could enter the
cylinders and cause extensive internal damage when the
engine is started.
It is important to note, during any maintenance procedure
replacement fasteners must have the same measure-
ments 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 inju-
ry. Therefore, fasteners removed should be saved for re-
use in the same locations whenever possible. Where the
fasteners are not satisfactory for re-use, care should be
taken to select a replacement that matches the original.
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