Starting System; Removal/Installation - Yanmar 1GM User Manual

190
potential probl em. When charging system trouble is first
suspec ted. perfonn the following:
1. Check the alternator drive belt for correct tension
(Chapter Three).
2. Check the battery to make sure it is in sa tisfactory con-
dition and full y charged and tha i all connectio ns arc clean
and secure.
3. Check all con nections at the alternator
10
mak e sure
they are clean and sec ure.
4 . Ifthc charg ing sys tem is nor perfo rmin g as
it
should af-
ter each of the abov e poi nts has been ca refully checked
and any unsat isfactory cond itions correc ted. refer to
Chapter Two and perfonn the
Charging System Tes ts.
Alt ernato r Removat/l nstaltatton
This section provides alternat or replacement proce-
du res. Com plete altern ator overhau l is not practical for
the home mechanic. In some cases. replacement parts are
una va ilable.
Thi s procedure is generalized to cover all applications.
Acce ss to the a lternator is qu ite lim ited in some eng ine
compartme nts and ca re should be taken to avoid personal
i nj ury,
I . Disconnect the negat ive battery cab le.
2.
Disconn ect all wiring harn esses and leads at the rear of
the altern ator. See Figu re
13.
typi cal.
NOTE
Whell loosening the retaining nut on an al-
temator
terminal, hold the terminal with a
wrench
to
prevent the terminal from rotat -
ing
3. Loo sen the alternator adjusting and pivot bo lts (Figu re
14. typical).
CHAPTE R NINE
4 . Swivel the alternator to ward the eng ine and remove
the drive belt from the altern ator pulley.
5. Support the alternator with one hand and remove the
adj usting and pivot bolts. noting the position ofany wash-
ers or spacers use d. Remove the a lternato r.
6.
Installation is the reverse o f removal. Tighten fasteners
secure ly and adj ust drive belt tension (Chapter Three) be-
fore reconnecting wiring harn esses and lead s to the rear o f
the alternator.
NOTE
Make sure the rubber boats at the end ofthe
wires fil snugly over the terminals on the al-
ternator; otherwise, the wire end..and termi-
nal. s may corrode.
STARTl I\G SYSTEM
The starti ng system consists of the battery, starter mo-
tor, starter solenoid. starter switch, key switc h, fuse and
connecting wiring . Sec F igure 12, typical.
Yanmar marine engines are equ ipped with a Hitachi
starter motor. Th e starter solenoid is enclose d in the drive
housing to protect it from expos ure to dirt and adverse
weather conditions,
Starter service requ ires experience and special too ls.
Refer to Chapter Two for troubleshooti ng procedu res. The
procedures described be low consist of removal, install a-
tion and brush replacement. An y repa irs inside the unit it-
self (ot her than brush rep lacement ) should
be
performed
by a dea ler or certified ele ctrical shop. Installation of a
professionally rebu ilt ma rine-type unit is gene rally less
expe nsive and more prac tical.
Starter Removal/Installation
I . Disconnect the negative battery ca ble.
-