c. If reading is high or infinite (no meter move-
ment), high resistance or an open exists in
the field circuit. Check for poor connections
between field winding leads and slip ring ter-
minals. If cause for open or high resistance
cannot be found, connect ohmmeter directly
to slip ring terminals. If correct reading is now
obtained, replace slip rings. If reading is still
high or infinite, replace complete rotor as-
sembly.
Stator
IMPORTANT: Stator leads MUST BE discon-
nected from rectifiers and diode-trio for this test.
!
CAUTION
Excessive heat from de-soldering may cause
damage to rectifiers or diode-trio assembly when
disconnecting leads.
d. If reading is low, a short exists in the field cir-
cuit. Inspect slip rings to be sure that they are
not bent and touching outer slip ring. Also be
sure that excess solder is not shorting termi-
nals to aft slip ring. If cause for short cannot
be found, unsolder field winding leads from
slip ring terminals and connect ohmmeter di-
rectly to leads. If correct reading is now ob-
tained, slip rings are shorted and must be re-
placed. If reading is still low, rotor field
windings are shorted, and complete rotor as-
sembly must be replaced.
1.
Test stator for grounds, using an ohmmeter (set
on Rx1 scale) as follows:
a. Connect one lead of ohmmeter or test lamp
to one of the stator leads and the other lead
to stator frame. Be sure that lead makes good
contact with frame.
b. Meter should indicate no continuity (meter
shouldnotmove).Ifcontinuitydoesexist,sta-
tor is grounded and must be replaced.
d
b
c
a
73101
73112
a - Field Winding Leads
b - Slip Rings
c - Rotor Shaft
NOTE: It is necessary to test only three of the six
leads on EITHER side of the stator as the leads are
interconnected in the windings.
d - Pole Pieces
2.
Test for opens in stator, using an ohmmeter (set
on Rx1 scale) as follows:
a. Connect ohmmeter or test lamp between
each pair of stator windings (3 different
ways).
b. Continuity should be present in all three
cases (meter should move). If it does not, one
or more of the windings are open and stator
must be replaced.
Index
4C-32 - CHARGING SYSTEM
90-823224--2 796
| 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.
Thank you