Prestolite 65 Amp Alternator
Replacement Parts Warning
Torque Specifications
Fastener Location
Housinhg Screws
Pulley Nut
In. Lb. Ft. Lb.
N·m
5.6
55
!
WARNING
35-50
30
48-68
2.8
Front Bearing Screws
Alternator Mount
Adjustment Bolt
Electrical, ignition and fuel system components
on your MerCruiser are designed and manufac-
tured to comply with U.S. Coast Guard Rules and
Regulations to minimize risks of fire and explo-
sion.
35
48
16
28
V-Belt Tension (Note)
Depress 1/4 in. (13mm)
Use of replacement electrical, ignition or fuel
system components, which do not comply with
these rules and regulations, could result in a fire
or explosion hazard and should be avoided.
Description
The alternator has a rotor, which is supported in two
end frames by ball bearings, and is driven by a pulley
at approximately twice engine speed. The rotor con-
tains a field winding that is enclosed between two
multiple-finger pole pieces. The ends of the field
winding are connected to two brushes (mounted in
the rear end frame) which make continuous sliding
(or slipping) contact with the slip rings. The current
(flowing through the field winding) creates a magnet-
ic field that causes the adjacent fingers of the pole
piecestobecomealternatenorthandsouthmagnetic
poles.
Specifications
Description
Excitation Circuit
Current Output
Specification
1.5 to 3.0 Volts
51 Amp. Min.
13.8 to 14.8 Volts
.5 MFD
Voltage Output
Condenser Capacity
Minimum Brush Length
3/16 in. (5 mm)
A 3-phase stator is mounted directly over the rotor
pole pieces and between two end frames. It consists
of three windings wound 120 degrees electrically
out-of-phase on the inside of a laminated core. The
windings are all connected together on one end,
while the other ends are connected to a full-wave rec-
tifier bridge.
Tools/Sealants
Description
Magneto Analyzer
Part Number
91-76032
Universal Puller Plate
Multi-Meter / DVA Tester
Quicksilver Liquid Neoprene
Ammeter (0-50 Amp.)
91-37241
The rectifier bridge contains six rectifiers which are
arranged so that current flows from ground, through
the stator and to the output terminal, but not in the op-
posite direction.
91-99750
92-27511--2
Obtain Locally
When current is supplied to the rotor field winding,
andtherotoristurned,themovementofthemagnetic
fields created induces an alternating current into the
stator windings. The rectifier bridge then changes
this alternating current to direct current which ap-
pears at the output terminal. A diode trio also is con-
nected to the stator windings to supply current to the
regulator and the rotor field during operation.
Voltage output of the alternator is controlled by regu-
lating the current supplied to the rotor field. This is ac-
complished by a transistorized voltage regulator that
senses the voltage at the battery and regulates the
field current to maintain alternator voltage within pre-
scribed limits for properly charging the battery. Cur-
Index
90-823224--2 796
CHARGING SYSTEM - 4C-19
| Categories | Mercury MerCruiser Manuals |
|---|---|
| Tags | Mercury MerCruiser 454 CID, Mercury MerCruiser 502 CID |
| Model Year | 1993, 1994, 1995, 1996, 1997 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.5 out of 5)
Marine readers have rated 1993 1997 Mercury-MerCruiser GM V8 454 CID 7.4L and 502 CID 8.2L Marine Engines Service Manual Number 16 4.5 out of 5.0 based on 4 product reviews. Hugely helpful service manual! Perfect. Thank you!
Manuals are all Important for Technician
This book is invaluable if you do your own repairs. Great book.
Could not find a copy until a search brought me here.
Excellent print.
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