SERVICE
MANUAL
MODELS
135 • 150 • 175 • 200
With Serial Numbers
United States . . . . . . 0G960500 and Above
Printed in U.S.A. 2000, Mercury Marine 90-878079 JANUARY 2000
,Notice
Throughout this publication, “Dangers”, “Warnings” and “Cautions” (accompanied by the In-
ternational 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 in-
jury or death.
CAUTION
Hazards or unsafe practices which could result in minor 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 servicing the
products described herein.
It is assumed that these personnel are familiar with the servicing procedures of these prod-
ucts, 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 in-
cludes the use of mechanics’ 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 service might be performed and of the possible hazards and/or results of each
method. We have not undertaken 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 products safety will be endangered by the
service procedure 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 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 internal damage when the engine is started.
90-878079 JANUARY 2000 Page i
, It is important to note, during any maintenance procedure replacement fasteners must have
the same measurements and strength as those removed. Numbers on the heads of the met-
ric 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. Mis-
matched 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 when-
ever possible. Where the fasteners are not satisfactory for re-use, care should be taken to
select a replacement that matches the original.
Cleanliness and Care of Outboard Motor
A marine power product is a combination of many machined, honed, polished and lapped
surfaces with tolerances that are measured in the ten thousands of an inch/mm. When any
product component is serviced, care and cleanliness are important. Throughout this manu-
al, 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 outboard which is suspended. Outboards should
be attached to work stands, or lowered to ground as soon as possible.
We reserve the right to make changes to this manual without prior notification.
Refer to dealer service bulletins for other pertinent information concerning the products de-
scribed in this manual.
Page Numbering
Two number groups appear at the bottom of each page. The example below is self-explana-
tory.
EXAMPLE:
90-878079R1 OCTOBER 1999 LOWER UNIT - 6A-7
Revision No. 1 Section Description
Month of Printing Section Number
Year of Printing Part of Section Letter
Page Number
Page ii 90-878079 JANUARY 2000
, Service Manual Outline
Section 1 - General Information & Specifications
General Information
& Specifications 1
A - Specifications
B - Maintenance
C - General Information
D - Outboard Installation
Ignition System
2
Section 2 - Electrical
A - Ignition
B - Charging & Starting System
C - Timing, Synchronizing & Adjusting
Fuel System
3
D - Wiring Diagrams
Section 3 - Fuel System
A - Fuel Pump
B - Carburetion
Powerhead
4
C - Fuel Injection
D - Oil Injection
E - Emissions
Mid-Section
5
Section 4 - Powerhead
A - Powerhead
B - Cooling
Section 5 - Mid-Section
Gear Housing
6
A - Clamp/Swivel Brackets & Drive Shaft Housing
B - Power Trim
Section 6 - Gear Housing
A - Right Hand Non-Ratcheting
Attachment/Control Linkage
7
B - Left Hand Non-Ratcheting
Section 7 - Attachments/Control Linkage
Section 8 - Color Diagrams
Color Diagrams
8
90-878079 JANUARY 2000 Page iii
MANUAL
MODELS
135 • 150 • 175 • 200
With Serial Numbers
United States . . . . . . 0G960500 and Above
Printed in U.S.A. 2000, Mercury Marine 90-878079 JANUARY 2000
,Notice
Throughout this publication, “Dangers”, “Warnings” and “Cautions” (accompanied by the In-
ternational 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 in-
jury or death.
CAUTION
Hazards or unsafe practices which could result in minor 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 servicing the
products described herein.
It is assumed that these personnel are familiar with the servicing procedures of these prod-
ucts, 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 in-
cludes the use of mechanics’ 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 service might be performed and of the possible hazards and/or results of each
method. We have not undertaken 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 products safety will be endangered by the
service procedure 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 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 internal damage when the engine is started.
90-878079 JANUARY 2000 Page i
, It is important to note, during any maintenance procedure replacement fasteners must have
the same measurements and strength as those removed. Numbers on the heads of the met-
ric 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. Mis-
matched 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 when-
ever possible. Where the fasteners are not satisfactory for re-use, care should be taken to
select a replacement that matches the original.
Cleanliness and Care of Outboard Motor
A marine power product is a combination of many machined, honed, polished and lapped
surfaces with tolerances that are measured in the ten thousands of an inch/mm. When any
product component is serviced, care and cleanliness are important. Throughout this manu-
al, 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 outboard which is suspended. Outboards should
be attached to work stands, or lowered to ground as soon as possible.
We reserve the right to make changes to this manual without prior notification.
Refer to dealer service bulletins for other pertinent information concerning the products de-
scribed in this manual.
Page Numbering
Two number groups appear at the bottom of each page. The example below is self-explana-
tory.
EXAMPLE:
90-878079R1 OCTOBER 1999 LOWER UNIT - 6A-7
Revision No. 1 Section Description
Month of Printing Section Number
Year of Printing Part of Section Letter
Page Number
Page ii 90-878079 JANUARY 2000
, Service Manual Outline
Section 1 - General Information & Specifications
General Information
& Specifications 1
A - Specifications
B - Maintenance
C - General Information
D - Outboard Installation
Ignition System
2
Section 2 - Electrical
A - Ignition
B - Charging & Starting System
C - Timing, Synchronizing & Adjusting
Fuel System
3
D - Wiring Diagrams
Section 3 - Fuel System
A - Fuel Pump
B - Carburetion
Powerhead
4
C - Fuel Injection
D - Oil Injection
E - Emissions
Mid-Section
5
Section 4 - Powerhead
A - Powerhead
B - Cooling
Section 5 - Mid-Section
Gear Housing
6
A - Clamp/Swivel Brackets & Drive Shaft Housing
B - Power Trim
Section 6 - Gear Housing
A - Right Hand Non-Ratcheting
Attachment/Control Linkage
7
B - Left Hand Non-Ratcheting
Section 7 - Attachments/Control Linkage
Section 8 - Color Diagrams
Color Diagrams
8
90-878079 JANUARY 2000 Page iii
