NISSAN 300ZX 1984 Z31 Electrical System User Guide

~~ STARTING SYSTEM -Starter-
Magnetic Switch
Check
1 Continuity test (between "S" terminal and
switch body)
No continuity Replace
From battery
VL Ohmrnet
2 Continuity test (between "S" terminal and
"M" terminal)
No continuity Replace
Coli
SEL047D
- Pinion/Clutch Check
1 Check clutch
Check pinion to see that it locks properly
when turned in "drive" direction and rotates
smoothly when turned in reverse
SEL569B
Pinion does not lock in either direction or
unusual resistance
is evident Replace
Replace pinion if teeth are worn or dam-
aged (Also check condition
of ring gear
teeth )
Replace clutch gear if teeth are worn or
damaged (Also check condition
of arma-
ture shaft gear teeth
)
2 Inspect pinion teeth.
3 Inspect clutch gear teeth
EL-I 1

STARTING SYSTEM -Starter-
Brush Check
BRUSH
Check wear of brush
Wear limit length: 11 mm (0.43 in)
Vernier caliper
SEL626B
Excessive wear Replace
BRUSH HOLDER
1 Perform insulation test between brush holder
(positive side) and its base (negative side)
SE L568B
Continuity exists . Replace
smoothly
2 Check brush holder to see if it moves
If brush holder is bent, replace it, if sliding
surface
is dirty, clean
Field Coil Check
Continuity test (between field coil positive
terminal and positive brushes)
ositive terminal
‘Ohmmeter
No continuity Replace fielk ~
SELUq6A
:oil
Insulation test (between field coil positive
terminal
and yoke)
Postwe terminal
I
1%
Continuity exists Replace field coil
EL-I 2

STARTING SYSTEM -Starter-
1 Continuity test (between two segments side by
side)
IY Ohrnketer
a No continuity Replace
Insulation
test (between each commutator bar
and shaft) 2
EE022
a Continuity exists Replace
a Rough . Sand lightly with No 500 - 600
3 Check commutator surface
sandpaper
! Check
4 Check diameter of commutator
Commutator minimum diameter
Less than specified value Replace
29 mm (1 14 in)
vernier caliper
tJ \Cornmurator
SEL418A
5 Check depth of insulating mica from commuta-
tor surface
a Less than 0 2 mm (0 008 in) Undercut
to 0 5.0 8 mrn (0 020 - 0 031 in)
Undercut procedures
Round 0 5 -08 mm (0 020 0 031 in)
Correct
Commutator
incorrect EEOZI
EL-1 3

STARTING SYSTEM -Starter-
Minimum length of brush mm (In)
Reassembly
11 10431
Carefully observe the following instructions
a. Apply grease
to:
Rear cover metal
Gear case metal
Frictional surface of pinion
Plunger of magnetic switch
Moving portion of shift lever
With pinion driven out by magnetic switch, push
pinion back to remove slack and measure dif-
ference
"2" between the front edge of the pinion
and the pinion stopper.
Difference "P":
0.3 - 1.5 mm (0 012. 0.059 in)
"Q" 4+
SEL497D
Not in the specified value Adjust by dust
cover (Adjusting plate).
SEL5738
- Service Data and Specification-
- Applied model I A1 1
Less than 100 -
I Revolution rpm I Mare than 3.900
I More than 29 (1 141 Outer diameter of commutator mm (in1
157 196
1 116 20.35-44) Brush spring tension N (kg. Ibl
mm(in1 1 03-1510012-00591 Difference P" in height
of pinion assembly
EL-I 4

CHARGING SYSTEM
Wiring Diagram
SEL6240
EL-I 5

CHARGING SYSTEM
Make sure "S ' termmal 8s con- IC-RG IC regulator
When reaching "Damaged
A C G.", remove
0 K. IC-alternator 16 In good condltlon nected COrreCtly
Trouble-Shooting
Before conducting an alternator test, make sure that the battery IS fully charged A 30-Volt voltmeter and
suitable test probes are necessary for the test The alternator can
be checked easily by referrmg to the
Inspection Table
Engine tdltng Lighting $witch "ON,, (Check light for operatlonl
WITH IC REGULATOR
bulb Replace and Proceed -
Wpth alternator side L terminal grounded, internal short occurs when + diode IS short-circuited @
Ignition witch "ON" cOnneCtor IS. (Check light Ll and ground for operatton1 L lead w~re Connect con-
I lH,TACHl nector IS LI far operation1 and ground F
I [Check Itght I for operation1
I (MITSUBISHI ' makel I - - - - - - - - - - - - -------- -
J
..........................
Contact poiitwe lead (+I of voltmeter on B
Lqht "OFF"
9
Engine speed 1,500 rpm
terminal and negative lead (-1 to L terminal
(Measure the "oltage acres "E" and "L"
only)
Contact tip of wlre with brush and attach wire to
alternator body -0 Light"0FF" -- OK
5) Terminals "S", "L", "BAT" and "E" are marked
on rear cover
of alternator.
Brush lift wire
SEL766D
EL-1 6

CHARGING SYSTEM -Alternator-
Construction
A2T48195 (MITSUBISHI make) Through-bolt m39 541040-055.29 401
,- Front cover r I
- ~ear~ng retainer
- Diode assembly 16 0.7 5,43 54)
("1 N m lkg-rn. it-lbl
SEL625D
*Rear bearing
CAUTION. Rear cover may be hard to remove because
a ring is used to lock outer race of rear bearing Be careful not to
lose this ring during removal.
LR170-701B (HITACHI make)
(4 0 -6.0, 29.43) n 39 59
("1 N m Ikg-m, ft-lbl
Dlodt, assembly SEL626D
EL-I 7

____ ____
CHARGING SYSTEM -Alternator-
Removal
Remove bolts from alternator
Remove bolts for front stabilizer
Manually
move stabilizer down and remove
alternator
SEL627D
Disassembly
CAUTION.
Rear cover may be hard to remove because a ring
IS used to lock outer race of rear bearing To facili-
tate removal of rear cover, heat just bearing box
section with
a 200-wan soldering iron
Do not use a heat gun, as it can damage diode
assembly.
SEL628D
Rotor Slip Ring Check
1. Continuity test
Ohmmeter
SEL629D
No continuity Replace rotor
2. Insulator test
Ohmmeter
IWI
SEL630D
Continuity exists. Replace rotor.
3. Check slip ring for wear.
Slip ring minimum outer diameter.
21.6 mm (0.850 in) [HITACHI makel
22.4
mm (0.882 in) [MITSUBISHI makel
EL-I 8

CHARGING SYSTEM -Alternator-
Brush Check
1 Check smooth movement of brush
Not smooth Check brush holder and
clean
2 Check brush for wear
SEL631D
Replace brush if it is worn down to the
3. Check brush pig tail for damage
Damaged Replace
4 Check brush spring pressure
Measure brush spring pressure with brush pro-
jected approximately
2 mm (008 in) from
brush holder
Spring pressure.
limit line
1.471 - 3.531 N (150 - 360 9,
5.29 - 12.70 02) [HITACHI make]
10.93 - 15 17 02) [MITSUBISHI make]
3.040 - 4 217 N (310 - 430 9,
2 mm (0 08 in1
IP-
EE049
Not in the specified value Replace
- Stator Check
To test the stator or diode, you must separate
them
by unsoldering the connecting wires.
CAUTION.
Used only
as much heat as required to melt solder.
Diodes will
be damaged by excessive heat.
Long nose pliers used a$ a heal sink
-1, /

SEL054D
1 Continuity test
y_ Lead wire -
SEL070
No continuity Replace stator
2 Ground test
SE LO7 1
Continuity exists Replace stator
EL-19

CHARGING SYSTEM -Alternator-
Ohmmeter probes
~ositive 0 Negative 8
Positive diode plate Diode terminals
Diode terminals Positive diode plate
Negative diode plate Diode terminals
Diode terminals Negative diode plate
Diodes check (Positive side)
Diodes check (Negative side)
Diode Check
Continuity
Yes
No
No
Yes
[ MlTSUBlSHl makel
Negatwe diode plate

piate
SEL767D Sub dlode
Subdiode
Attach ohmmeter's probe to each end of diode
to check for continuity.
SEL910A
Continuity is N.G. ... Replace diode assembly.
[HITACHI makel
SEL768D
Subdiode
Attach ohmmeter's probe to each end of diode
to check for continulty.
Continuity is N.G. . Replace diode assembly
EL-20