Mariner 100, Service Manual, Page: 2 / 391

Notice
Throughout this publication, “Dangers”, “Warnings”
and “Cautions” (outlined in a border and accompa-
nied by the International HAZARD Symbol
) are
used to alert the mechanic to special instructions con-
cerning 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.
DANGER
DANGER — Immediate hazards which WILL result
in severe 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 minor personal injury or product or
property damage.
CAUTION
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 person-
nel when servicing 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 Mer-
cury Marine, that they have been trained in the recom-
mended servicing procedures of these products
which includes the use of mechanic’s common hand
tools and the special Mercury Marine or recom-
mended tools from other suppliers.
We could not possibly know of and advise the service
trade of all conceivable procedures by which a ser-
vice might be performed and of the possible hazards
and/or results of each method. We have not under-
taken any such wide evaluation. Therefore, anyone
who uses a service procedure and/or tool, which is
not recommended by the manufacturer, first must
completely satisfy himself that neither his nor the
product’s safety will be endangered by the service
procedure selected.
All information, illustrations and specifications con-
tained in this manual are based on the latest product
information available at the time of publication. As re-
quired, revisions to this manual will be sent to all deal-
ers contracted by us to sell and/or service these prod-
ucts.
It should be kept in mind, while working on the
product, that the electrical system and ignition system
is 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 which
could enter the cylinders and cause extensive inter-
nal damage when the engine is started.
It is important to note that, during any maintenance
procedure, replacement fasteners must have the
same measurements and strength as those re-
moved, whether metric or customary. Numbers on the
heads of the metric bolts and on surfaces of metric
nuts indicate their strength. Customary bolts use ra-
dial lines for this purpose, while most customary nuts
do not have strength markings. Mismatched or incor-
rect fasteners can result in damage or malfunction, or
possible personal injury. Therefore, fasteners re-
moved should be saved for re-use in the same loca-
tions whenever possible. Where the fasteners are not
satisfactory for re-use care should be taken to select
a replacement that matches the original.