ALTRONICV SERVICE MANUAL

SMALL ENGINES, 1-6 CYLINDERS FORM AV SM 12-96

ALTRONIC, INC.
712 TRUMBULL AVE.
GIRARD, OHIO 44420

ALTRONIC V IGNITION SYSTEM

4400 SERIES - SIN 4400 & UP

IMPORTANT SAFETY NOTICE

PROPER INSTALLATION, MAINTENANCE, REPAIR AND OPERATION OF THIS

EQUIPMENT IS ESSENTIAL THE RECOMMENDED PRACTICES CONTAINED
HEREIN SHOULD BE FOLLOWED WITHOUT DEVIATION. AN IMPROPERLY
INSTALlED OR OPERATING IGNITION SYSTEM COULD CAUSE PERSONAL
INJURY TO OPERATORS OR OTHER NEARBY PERSONNEL.
TABLE OF CONTENTS ALTRONIC V SERVICE MANUAL

SECTION ITEM PAGE

1.0 SYSTEM DESCRIPTION 3
2.0 PARTS IDENTIFICATION AND SPECIFICATION 4
2.1 Parts List 5
2.2 Part No. Designation 6
2.3 Unit Specifications 6
3.0 PERFORMANCE SPECIFICATIONS 7
3.1 Voltage Test 7
3.2 Operating Test 7
3.3 Timing Specifications 7
4.0 TROUBLESHOOTING 8
4.1 Circuit Diagram 8
4.2 Oscilloscope Testing 9
4.3 Procedure 10
4.4 One Output Does Not Fire 10
4.5 System Has Weak or No Output 10
5.0 SERVICE - ALTERNATOR SECTION 10
5.1 Disassembly 10
5.2 Parts Replacement 10
5.3 Reassembly 11
6.0 SERVICE - BACK COVER ASSEMBLY 12
6.1 Circuit Board Assembly Replacement 12
6.2 Pickup Coil Assembly Replacement 12
6.3 Driven Gear/Magnet Arm Assembly 13
6.4 Driven Shaft, Bearing 13
6.5 Reassembly - Driven Shaft Assembly 13
6.6 Reassembly - Back Cover to Alternator 14
7.0 SERVICE-ASSEMBLY TOOLS 15
8.0 OPERATIONAL TEST 15

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1.0 ALTRONIC V IGNITION SYSTEM - DESCRIPTION
Altronic V is an alternator powered, electronic ignition system. All electronic parts are mounted to the back cover
which disconnects as a module from the alternator section.

The alternator (A) provides the power to charge energy storage capacitor (8). A separate pickup coil (C) and SCA
(D) are used for each of the system's outputs which correspond usually to each engine cylinder. A rotating timer arm
(E) driven through speed reducing gears (F) passes over the pickup coils to trigger on the SCA switches in sequence.
This releases the capacitor's stored energy to the ignition coils which step up the voltage to fire the spark plugs.

CROSS SECTIONAL VIEW - ALTRONIC V UNIT

A - Alternator D - SCA electronic switch
8 - Energy storage capacitor E - Timer arm
C - Pickup coil F - Distribution gears

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 41 42

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4S/ 27b ""'~"
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]1 J·j]4 41 44

10 14 15
/ \ \

160 16b
I \
(biIDi ~~
40
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~1@J I· II 12 I]

~ 13
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17b
2.0 PARTS IDENTIFICATION AND SPECIFICATION

2.1 PARTS LIST - ALTRONIC V - Reference the exploded view on page 4.

REF. NO. PART NO. DESCRIPTION REF NO PART NO DESCRIPTION
1 510 454-U Coupling, yellow 26c 570010 Plate-bushing ass'y. 3A
510699 Coupling (109-8912 only) 570011 Plate-bushing ass'y. 2A
1a 902478 Spring pin 2-1/8" Ig. 570012 Plate-bushing ass'y. 1A
3 410063 Bearina-shaft (-A -AM -D) 570020 Plate-bushina ass'y. 4A
510654 Bearing-shaft (-AW,-GVW) 570021 Plate-bushing ass'y. 5A
4 560 004-1 Housing (-A -AM -AW) 570022 Plate-bushing ass'y. 6A
560 004-2 Housing (-GV,-GVW) 26d 510627 Spacer - 1A, 2A, 3A
560 004-3 Housina (-D) 510651 Spacer-4A,5A,6A
560 004-4 Housina (-GVC) 26e 902574 Screw 6-32
560 004-5 Housing (109-8912) 26f 610117 Snap ring
4a 510541 Ventilator 27 See pg. 6 Circuit board assembly
5 502134 Nameplate - 2.0" X 1.9" 27a 301 208-2 Zener diode (10M120Z5)
502168 Nameplate - 3.5" X 1.1" 301 233-3 Zener diode (10M150Z5)
6 902520 Drive pin 27b 504161 Nut 10-32, zener diode
7 160 001 Magnet-rotor 27c 583 007 Plug assembly
8 410039 Gasket 29 501 335 Gasket, 5-pin connector
9 571 003 Stator 501 368 Gasket, 7-pin connector
10 310518 Drive aear 1.5:1 30 510597 Spacer
510357 Drive gear 2:1 31 570005 Rear cover, 5-pin conn.
510359 Drive gear 3:1 570028 Rear cover, 7-pin conn.
510625 Drive gear 1:1 570029-1 Rear cover, 5-pin w/timing
11 901 326 Washer 570029-2 Rear cover, 7-pin w/timing
12 900 944 Lockwasher #8 31a 410058 Bearing_
13 902465 Screw 8-32 31b 510660 Shaft, driven
14 510462 O-ring 32 902459 Nut 6-32
15 410038 Spacer 33 902602 Washer
16a 902585 Screw 5/16"-18 34 902565 Screw 6-32
16b 901 010 Lockwasher 5/16" 35 902591 Washer
16c 902586 Washer 37 302106 Timing label, shaft
17a 902487 Snap ring 38 502142 Timing label, cover
17b 902503 Washer 39 310365 Cover plate
18 410045 Spacer 40 902058 Screw 6-32
19 902541 Screw 8-32 41 901 004 Lockwasher
20 900996 Lockwasher #4 42 902567 Screw 10-24 X 1.25"
21 570017-1 Driven gear ass'y. 1: 1 902587 Screw 10-24 X 2.0"
570017-2 Driven gear ass'y. 2:1 43 902064 Screw 6-32
570017-3 Driven gear ass'y. 3: 1 44 902483 Screw 10-24
570017-6 Driven gear ass'y. 1.5:1 45 902645 Washer, sealina
25 902564 Screw 4-40 47 902579 Washer, shim
26 570401 Pickup plate ass'y. 1A * 562001 Connector assembly
570402 Pickup plate ass'y. 2A * 501 369 Gasket
570403 Pickup plate ass'y. 3A * 900966 Lockwasher
570404 Pickup plate ass'y. 4A * 902525 Screw 4-40
570405 Pickup plate ass'y. 5A * Parts for units with electronic timing option (not
570406 Pickup plate ass'y. 6A illustrated).
26a See po. 12 Pickup coil ass'y.
26b 570008 Plate-core ass'y. 2A NOTE: Reference numbers with a letter suffix are
570009 Plate-core ass'y. 3A part of the assembly of the same number
570015 Plate-core ass'y. 1A withoutthe suffix. Example: (1 a) is part of (1).
570025 Plate-core ass'y. 4A
570026 Plate-core ass'y. 5A
570027 Plate-core ass'y. 6A

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NOTE: It is recommended that 581 40x circuit boards be updated (exchanged) for the 572 61 x series.

UNIT NO. BACK COVER CIRCUIT BOARD ASS'Y. (27)

1A18 581 401-1 572 612
1A28 581 401-2 572 612
1A28H 581401-2H 572 612H
2A14 581 404-1 572 613
2A18H 581 402-2H 572 612H
2A25 581 404-3 572 613
2A28 581 402-1 572 612
2A28H 581 402-1H 572 612H
2A64 581 404-2 572 613
3A14 581 406-2 572 613
3A25 581 406-4 572 613
3A35 581 406-3 572 613
3A64 581 406-1 572 613
4A24 581 407-1 572 614
4A34 581 407-2 572 614
5A24 581 405-1 572 616
6A24 581 408-2 572 616
6A34 581 408-1 572 616
61-2611* 581 407-2 572 614 (Follow testinQ for 4A34)
328-8382* 581 407-2 572 614 (Follow testing for 4A34)
9Y-6465* 581 408-1 572 616 (Follow testing for 6A34)
109-8912* 581 408-2 572 616 (Follow testing for 6A24)
* Caterpillar OEM units.
3.0 PERFORMANCE SPECIFICATIONS:
A. Install unit on a test stand equipped with a suitable number of 501 061 coils and spark gaps. Test stand wiring
should conform to that shown in the Installation Instructions form AV II for 6-cylinder engines.

3.1 VOLTAGE TEST

A. With the wiring harness unplugged, measure the positive voltage at the connector "G" pin:

UNIT SPEED CIRCUIT BOARD NO. CONNECTOR PIN VOLTAGE OUTPUT

500 rpm 572 602, 572 612 "E.. 111-129 VDC
572 602H, 572 612H "E" 140-160 VDC
572 603, 572 613 IIEII 140-160 VDC
572 604 572 614 "G" 140-160 VDC
572 606, 572 616 "G" 140-160 VDC

3.2 OPERATING TEST

A. At 50 rpm of the back cover a 7mm gap should fire consistently.
B. At the TEST RPM, a 15mm gap should fire consistently.

3.3 TIMING SPECIFICATIONS

A. Timing should be as specified in the table below as measured on a standard ignition test stand with the degree
wheel indicator rotating at the unit coupling speed.
B. If timing is out of specification, change the pick-up coil (31) in question.

COUPLING COUPLING FIRING SEQUENCE DEGREES

UNIT NO. TEST RPM ROTATION A B C D E F TOLERANCE + /-
1A18 1,300 cw O* -
1A28 1,300 cw O** -
1A28H 1,300 cw O** -
2A14 2,000 cw 0 180 2
2A18H 700 cw 0 180 2
2A25 2,400 cw 0 0 2
2A28 1,300 cw 0 0 2
2A28H 1,300 cw 0 0 2
2A64 3,000 cw 0 90 3
180 270
3A14 2,000 cw 0 120 240 2
3A25 2,000 cw 0 240 120 2
3A35 3,000 cw 0 0 0 3
3A64 3,000 cw 0 0 0 3
180 180 180
4A24 2,000 cw 0 180 0 180 2
4A34 3,000 cw 0 270 180 90 3
5A24 2,000 cw 0 144 288 72 216 2
6A24 2,000 cw 0 120 240 0 120 240 2
6A34 3,000 ccw 0 180 0 180 0 180 3
* 15-17 degree retard at low speed.
** 30-34 degree retard at low speed.

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4.0 TROUBLESHOOTING

4.1 CIRCUIT DIAGRAM

A. The diagram below shows the Altronic V circuit for one cylinder. Each component in the Timing-Distribution
section (to the right of the dashed line) is present in a quantity equal to the number of system outputs; each
output requires a pick-up coil assembly, capacitor C3 and power SCR2.
B. The operation is as follows: The AC voltage generated by the alternator is converted to DC by diodes D1 and
stored in the energy storage capacitor C1. The DC voltage level is regulated by zener diode Z. Capacitor C2 is
charged through resistor R1 to provide the energy to trigger power SCR2. This occurs when the rotating
distributor arm passes a pick-up coil (P) triggering on SCR1 and connecting capacitor C2 through resistor R3
to the gate of SCR2. SCR2 then turns on discharging capacitor C1 into the primary of the ignition coil which
steps up the voltage to fire the spark plug. Capacitor C3 acts as a filter to prevent crossfiring between outputs.

R5 'E'
v-~---------------------------------------o

D2 D2 D2

SCP2
,--------, TO
I SPARK
I P PLUG
I P4 "A, R C'
)
R2 +
R3
z I SCPl
L ___________ -.l

TO
Cl C2 C3 SPARK
PLUG

"D'

C. Components:
C1 Capacitor, energy storage SCR1,P,R2,R3 Pick-up coil assembly
C2 Capacitor, trigger SCR2 Power SCR
C3 Capacitor, filter R1 Resistor, trigger circuit
D1 Diode R4 Resistor, SCR J]8te
D2 Diode, dual R5 Resistor
D3 Diode, blocking_ Z Zener diode

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4.2 OSCILLOSCOPE TESTING - The system should be fully connected per section 3.0 with the Altronic V unit
operating at the TEST RPM given in section 3.3. Connect the oscilloscope probe to the shutdown lead of the
output connector - "E" for the 5-pin connector or "G" for the 7-pin connector. Set the oscilloscope vertical
calibration to 50 volts/dlv.; adjust the time base to get a full cycle of firings on the screen: No. of discharges =
number of outputs for the unit.
A. STORAGE CAPACITOR PATIERN: NORMAL - The normal patterns for typical 3-output (3A64) and 6-output
(6A34) units are shown below.
3-0UTPUT UNIT - 3A64 6-0UTPUT UNIT - 6A34

200V, 200V,
,
~/
I
lOOV,
/ / / / / t / / lOOV,
I II
V /: I I / I I I
~ I ¥ )
/
OV, ~ / ), / j OV,

B. STORAGE CAPACITOR PATIERN: ABNORMAL - One cylinder misfiring. See troubleshooting section 4.4.

3-0UTPUT UNIT - 3A64 6-0UTPUT UNIT - 6A34

200V, 200V,

lOOV,
v )' v ) 1/ / V lOOV,
V L
V
I 'I t I I
OV, L V ~ l ,; ) l OV,

C. STORAGE CAPACITOR PATIERN: ABNORMAL - Irregular waveform. See troubleshooting section 4.5.

3-0UTPUT UNIT - 3A64 6-0UTPUT UNIT -6A34

200V, 200V,

lOOV, r- f0- r- r - r: r , r lOOV,

, V
,- ,. J ~ ,J J V ,J J ,.1
OV, ..L V L 1. j V J j OV,

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4.3 PROCEDURE
A. See section 3.0-3.3 for proper performance.
B. Use Simpson model 260 meter on RX10,000 scale unless otherwise specified.
C. First discharge all capacitors. Carefully use a screwdriver to short from the connector shell first to the "E" pin on
5-pin connector or "G" pin on 7-pin connector, then to all other pins.

4.4 ONE OUTPUT DOES NOT FIRE

A. Check that the 2-lead pickup coil connector is fully plugged into the circuit board receptacle.

B. Check with ohmmeter as follows: Positive lead to case; negative lead to connector pin with no output. Move
the timer arm (21 a) past the pickup coil corresponding to the test connector pin ("A" is red; "B", "C", etc. follow
in a CW direction from "A"); meter should pulse indicating pickup coil output. If not, replace pickup coil assembly
(26a) - see section 6.2.
C. If above tests are OK, replace circuit board assembly (27) - see section 6.1.

4.5 SYSTEM HAS WEAK OR NO OUTPUT

A. Check stator (9) resistance - replace if defective - see section 5.0.
1. Center pin to outer pin: 450-650 ohms (RX100 scale)
2. Center pin to other outer pin: 5000-6000 ohms
3. Center pin to lamination core: infinite

5.0 SERVICE - ALTERNATOR SECTION

A. The unit breaks down into two major parts: the Alternator Section and the Back Cover Assembly. Remove the
four back cover attaching screws (42), (44) and carefully pull the back cover assembly away from the alternator
housing; unplug the 3-prong internal connector.
B. The procedures of this section require the use of an arbor press.

5.1 DISASSEMBLY
A. Remove the phenolic spacer (15), O-ring (14) and stator (9) from the alternator housing.
B. -AW/-GVW UNITS ONLY: Remove hardware (16a), (16b), (16c) or (17a), (17b) and sleeve (18) from unit shaft.
C. Drive spring pin (1 a) out of coupling (1) and shaft and remove coupling.
D. Remove screw (13), lockwasher (12), washer (11) and drive gear (10).
E. If it is necessary to replace bearing-shaft (3), support the housing on the coupling end and press shaft out of the
magnet-rotor assembly and housing.
F. Wrap magnet-rotor assembly (7) in a cloth or paper to keep it clean.

5.2 PARTS REPLACEMENT

A. Replace gasket (8).
B. Replace coupling (1) and bearings (3) and (31 a) with new parts.
C. Replace any removed hardware with new parts.
D. Aluminum housings should be cleaned with carbon tetrochloride or similar cleaning solution.
E. Any metal filings should be cleaned from magnet-rotor (7) before reassembly.

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5.3 REASSEMBLY - ALTERNATOR SECTION
A. Press new bearing-shaft (3) into housing (4) until it bottoms against shoulder. Housing (4) should be supported
behind the internal shoulder with tool no. 506 101 B. Push on the outer race of the bearing using tool 506 101 A.
B. Clean all debris from the magnet-rotor assembly (7).
C. Slide magnet-rotor assembly (7) over shaft with plate facing out as shown below. Support the shaft on the
coupling end using tool no. 506 102B and, using tool no. 506 102C, press magnet-rotor assembly (7) on the shaft
0.575" past the shoulder for the drive gear.
D. Slide coupling (1) onto the shaft and secure with spring pin (1a) through the coupling and shaft.
E. -AW/-GVW UNITS ONLY: Install sleeve (18) and engine gear. Secure with hardware (16a), (16b), (16c) or (17a).
(17b) - see page 4.
F. Inspect gear (10); replace if worn. Secure with new hardware (11), (12), and (13).
G. Reinstall stator with leads at the 6 o'clock position, a new O-ring (14) and spacer (15).

HDUS1NG (4)

CDUPLlNG (1)

SLEEVE ()8)\
,- --
,1----
II
II
II
LI- __ _

MAGNET-ROTOR (7)

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6.0 SERVICE - BACK COVER ASSEMBLY
A. Replace only those parts requiring service.

6.1 CIRCUIT BOARD ASSEMBLY (27) - REPLACEMENT

A. Use a small screwdriver to pull the circuit board receptacle levers away from the 2-lead housing of the pickup
coil connectors; then unplug the pickup connectors from the circuit board (27).
B. Remove four screws (43), zener diode nut (27b) and washer (45), screw (34), washer (33) and nut (32). The
circuit board can then be removed from the cover. Keep track of spacer (30).
C. Reverse steps 5.1 A and 5.1 B to reassemble.
NOTE: Use new parts for washers (33) and (45) - see page 5.

6.2 PICKUP COIL ASSEMBLY (268) - REPLACEMENT

A. Remove hardware (19), (12), (11) holding the driven gear/magnet arm assembly. Pull driven gear/magnet-arm
assembly (21) from the driven shaft.
B. Unplug the pickup coil connector in question - see 6.1 A.
C. To replace a pickup coil (26a) , remove three screws (26e) and plate assembly (26c). On 1-cylinder units only,
remove the small snap ring (26f). Then remove the pickup coil in question.
D. When installing the new pickup coil, the end with the marked line must face out against plate (26C). Rotate the
coil body so that the bulge does NOT face inside the circle of the O.D. of the bearing (31 a) - see orientation as
shown below.
E. To reinstall top plate (26c), insert screws (26e) through plate (26c) and spacers (26d) intothe plate-core assembly
(26b); then tighten screws (26e).
F. Plug the pickup coil connector into the circuit board receptacle.

570 401 CIA) 570 402 (2A) 570 403 C3A)

A A

o 0

A-55! 002-1 A - 551 002-4 A-55! 002-)

B - 551 002-4 B - 55) 002-2
C - 55) 002-3

570 404 C4A) 570 405 (SA) 570 406 (6A)

A

D
A - 551 002-5 A-55! 002-) A,E,r- - 551 002-5
B - 551 002-4 B - 55! 002-2 B - 551 002-1
C - 551 002-4 C - 551 002-2 C - 551 002-2
D - 551 002-2 D - 55) 002-4 D - 551 002-3
E - 55! 002-2

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6.3 DRIVEN GEAR/MAGNET ARM ASSEMBLY (21)
NOTE: Early-production assemblies having the driven gear held to the magnet-arm with slotted pan-head screws
should be updated to the equivalent one-piece driven gear/magnet-arm assembly (21).
A. Remove screw (19) and pull driven gear/magnet-arm assembly (21) from shaft (31 b). DO NOT loosen the three
small button-head, hex-socket screws holding the gear assembly together. Keep track of shim washers (47).

6.4 DRIVEN SHAFT (31b), BEARING (31.)

NOTE: It is recommended that all units be updated to the current design press-fit secured driven shaft (31 b).
A. The procedures of this section require the use of a small arbor press.
B. Remove the driven gear assembly (21) per section 6.3.
C. Unplug the pickup coU connectors - see step 6.1 A.
D. Remove three screws (25) and lockwashers (20). Then pull the entire pickup plate assembly (26) off bearing
(31 a).
E. Remove cover plate (39) and timing decal (37).
- SNAP-RING SECURED DRIVEN SHAFT - Remove snap ring and pull driven shaft assembly from bearing (31a).
- PRESS-FIT SECURED DRIVEN SHAFT - Press shaft (31 b) out of bearing (31 a).
F. Press bearing (31a) out of rear housing (31).
G. Support housing (31) with tool 506 103B; slide bearing (31 a) over guide of tool no. 506 103B and press bearing
into housing with tool no. 506 103A until it bottoms.
H. Support bearing (31 a) on the inner race with tool 506 104B and press, using tool 506 104A, on the gear shoulder
of shaft (31 b) until the shaft bottoms against bearing.

6.5 REASSEMBLY - DRIVEN SHAFT ASSEMBLY

A. Reinstall the pickup plate assembly (26) and secure with hardware (20) and (25).
B. Plug the pickup connectors into the circuit board receptacles.
C. Slip shims (47) - the same number as removed, if any - over the end of shaft (31 b) against shoulder.
D. Check that the air gap between the rotating arm and the plate (26c) is .005"-.018". If the air gap requires
adjustment, first remove screw (19) holding the driven gear and pull the assembly (21) from the shaft. Add or
subtract a shim washer (47) to increase or decrease the air gap. Reinstall assembly (21 ) and secure with hardware
(11), (12) and (19).
E. Using a small brush, apply a thin coat of silicone compound (GC type 5Z; Altronic part no. 503 259) to the teeth
of the driven gear (21).
F. Install washer (35), timing decal (37), lockwasher (12) and screw (19) but tighten screw so that the lockwasher
just starts to compress.
G. Place the timing arm (21) centered on the red pickup coil core. The red mark on decal (37) should be placed
midway between the CCW and CW marks of the label. Tighten screw (19).
H. Install cover plate (39) and secure with two screws (40).

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6.6 REASSEMBLY - BACK COVER TO ALTERNATOR SECTION

A. Set the back cover assembly with the timing mark aligned to either CCW or CW as required for the application.
Set the alternator coupling angle as shown in the chart below.

B. Mate the back cover to the alternator keeping the alignment of the back cover timing mark and alternator coupling
as set in step 6.6A.

C. Secure the back cover to the alternator keeping the alignment of the back cover timing mark to the alternator
with hardware (41), (42) and (44).

BACK COYER
TIMING INDICA TOR

COUPLING ANGLE
UNIT NO CCW CW
1A18-GV 00 -
1A28-A - 70 0
2A14-A,GV 00 70 0
2A14-AW,GVW - 70 0
2A14-0 - 00
2A18H-GV - 70 0
2A25-A - 70 0
2A28-AGV - 70 0
2A64-GVW - 70 0
0
3A14-A GV 0 70 0
3A14-0 - 00
3A25-GV 0 0
-
3A35-A - 70 0
3A64-AGV 00 70 0
3A64-AM - 45 0
3A64-AW,GVW - 70 0
0
4A24-A,GV 0 70 0
4A24-AWGVW - 70 0
4A24-0 - 00 CJ
4A34-GVW - 70 0
5A24-GV 00 -
6A24-0 - 00
6A24-GV 0 0
-
0
6A34-AGV 0 70 0
6A34-AM - 450
6A34-AWGVW - 70 0
6A34-GVC - 70 0
61-2611 0 0
-
9Y-6465 0 0
-
109-8912 00 -

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7.0 SERVICE - ASSEMBLY TOOLS
A. The following assembly tools are referred to in sections 5.3 and 6.4.
506 101A Press bearing-shaft (3) into housing (4)
506 101B Support housing (4)
506 102B Support shaft (3)
506 102C Press magnet·rotor assembly (7) on bearing-shaft (3)
506103A Press bearing (31a) into cover housing (31)
506 103B Support cover housing (31) and bearing (31a)
506104A Press shaft (31 b) into bearing (31a)
5061048 Support bearing (31 b)

8.0 OPERATIONAL TEST

A. Perform the tests following the guidelines of sections 3.0 through 3.3.
B. Run the Operating Test of section 3.28. for one hour.
C. After the one hour Operating Test, check timing per section 3.3.

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