YAMAHA Marine 50G User manual

6H2-28197-Z9-11
SERVICE
MANUAL
50G, 60F, 70B,
75C, 90A

E
NOTICE
This manual has been prepared by the Yamaha Motor Company Ltd. primarily for use by
Yamaha dealers and their trained mechanics when performing maintenance procedures and
repairs to Yamaha equipment. It has been written to suit the needs of persons who have a
basic understanding of the mechanical and electrical concepts and procedures inherent in the
work, for without such knowledge attempted repairs or service to the equipment could render
it unsafe or unfit for use.
Because the Yamaha Motor Company Ltd. has a policy of continuously improving its prod-
ucts, models may differ in detail from the descriptions and illustrations given in this publica-
tion. Use only the latest edition of this manual. Authorized Yamaha dealers are notified
periodically of modifications and significant changes in specifications and procedures, and
these are incorporated in successive editions of this manual.
A10001-0*
50G, 60F, 70B, 75C, 90A
SERVICE MANUAL
 1999 Yamaha Motor Co., Ltd.
1st Edition, February 1999
No part of this publication may be
reproduced or transmitted in any form or by
any means including photocopying and
recording without the written permission of
the copyright holder. Such written
permission must also be obtained before
any part of this publication is stored in a
retrieval system of any nature.

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A50000-0
HOW TO USE THIS MANUAL
MANUAL FORMAT
This manual provides the mechanic with descriptions of the operations of disassembly,
repair, assembly, adjustment and inspection, each of which is presented in a sequential, step-
by-step procedure.
To assist you to find your way about this manual, the Section Title and Major Heading is
given at the head of every page.
An Index to contents is provided on the first page of each section.
MODEL INDICATION
Multiple models are shown in this manual. These indications are noted as follows.
THE ILLUSTRATIONS
Some illustrations in this manual may differ from the model you have. This is because the
procedure described may relate to several models, though only one may be illustrated. (The
name of the model described will be mentioned in the description.)
To help you identify components and understand the correct procedures of disassembly and
assembly, exploded diagrams are provided. Steps in the procedures are numbered thus: 1),
2), 3). Parts shown in the illustrations are identified thus: 1 , 2 , 3 .
REFERENCES
These have been kept to a minimum, however, when you are referred to another section of
the manual, you are told the page number to go to.
Model name 50GETO 60FEHTO 60FED 60FEDO 60FET 60FETO 70BEDO 70BETO
USA and
Canada name — P60TH C60ER — C60TR — — 70TR
Indication 50GETO 60FEHTO 60FED 60FEDO 60FET 60FETO 70BEDO 70BETO
Model name 75CET 75CETO 75CEHTO 80AETO 90AEHD 90AED 90AET 90AETO
USA and
Canada name C75TR 75TR P75TH — — — C90TR 90TR B90TR
Indication 75CET 75CETO 75CEHTO 80AETO 90AEHD 90AED 90AET 90AETO

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SPECIFICATIONS
These are given in bold type at each procedure. It is not necessary to leave the section deal-
ing with the procedure in order to look up the specifications.
It is important to note the differences in specifications of models. Where a procedure relates
to more than one model, the main differences in specifications will be shown in the following
table.
WARNINGS, CAUTIONS AND NOTES
Attention is drawn to the various Warnings, Cautions and Notes which distinguish important
information in this manual in the following ways.
The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR SAFETY IS
INVOLVED!
WARNING
Failure to follow WARNING instructions could result in severe injury or death to the machine
operator, a bystander, or a person inspecting or repairing the outboard motor.
CAUTION:
A CAUTION indicates special precautions that must be taken to avoid damage to the out-
board motor.
NOTE:
A NOTE provides key information to make procedures easier or clearer.
Model name 50GETO 60FEHTO 60FED 60FEDO 60FET 60FETO 70BEDO 70BETO
USA and
Canada name — P60TH C60ER — C60TR — — 70TR
Control system Remote
control
Manual
control Remote control
Tilt system Power trim and tilt Manual tilt Power trim and tilt Manual tilt Power trim
and tilt
Lubrication
system Oil injection Pre-mixed Oil injection Pre-mixed Oil injection
Model name 75CET 75CETO 75CEHTO 80AETO 90AEHD 90AED 90AET 90AETO
USA and
Canada name C75TR 75TR P75H — — — C90TR 90TR B90TR
Control system Remote control Manual
control
Remote
control
Manual
control Remote control
Tilt system Power trim and tilt Manual tilt Power trim and tilt
Lubrication
system Pre-mixed Oil injection Pre-mixed Oil injection

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A50001-1-4
SYMBOLS
Symbols 1 to 9 are designed as thumb-
tabs to indicate the content of a chapter.
1 General Information
2 Specifications
3 Periodic Inspection and Adjustment
4 Fuel System
5 Power Unit
6 Lower Unit
7 Bracket Unit
8 Electrical Systems
9 Trouble Analysis
Symbols 0 to F indicates specific data:
0 Special service tool
A Specified liquid
B Specified grease
C Specified engine speed
D Specified torque
E Specified measurement
F Specified electrical value
[Resistance ( Ω ), Voltage (V),
Electric current (A)]
Symbol G to J in an exploded diagram
indicate grade of lubricant and location of
lubrication point:
G Apply engine oil
H Apply gear oil
I Apply molybdenum disulfide oil
J Apply water resistant grease (Yamaha
marine grease A, Yamaha marine grease)
Symbols K to N in an exploded diagram
indicate grade of sealing or locking agent,
and location of application point:
K Apply Gasket Maker

L Apply LOCTITE

No. 271 (Red LOCTITE)
M Apply LOCTITE

No. 242 (Blue LOCTITE)
NApply LOCTITENo. 572
NOTE:
In this manual, the above symbols may not
be used in every case.
12
34
56
78
90
AB
CD
EF
GH
IJ
KL
MN
GEN
INFO SPEC
INSP
ADJ FUEL
POWR
LOWR
BRKT –+
ELEC
TRBL
ANLS
T
R
.
.
EG
MA
GM
271
LT
242
LT
572
LT