Merc-O-Tronics 98 Manuel utilisateur

THIS SHEET APPTIES TO MODELS

SERIAL NO's. I 5 p00 AND

DESCRIPTION

PATENTED - OTHERS PENDING

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Figure I

SERVICE NOTES

May we sqggest, nhen testi,ng, place Wagneto Analyzer as uell as Com-

ponent Magneto Pmts on an INSULATED OR WOODEN TABLE TOP. This

will preuent any leakage or shock hazards.

Your Merc-O-Tronic Ignition Analyzer is equipped with either a motor

or a vibrator. The motor has oil lite bearings and should be lubricated

with a light oil once every six months. Lubricate cam wick at same time.

(DO NOT OVER LUBRICATE. ) If replacement of breaker point is re-

quired, order from Merc-O-Tronic Instruments Corporation as this is a

special breaker assembly. Breaker points are to be set at 0.013. Pres-

sure not to exceed 15 oz.

If vibrator fails to operate check and make certain that vibrator is in

socket. When inserting vibrator, make certain pins line up with holes in

socket.

NOTE: This is a special vibrator, if replacement is necessary order

from your distributor or direct from factory. Merc-O-Tronic Part No.

1960-V-6593. (DO NOT ATTEMPT rO USE ANy STOCK VTBRATOR.)

Your analyzer is equipped with a Burgess 4F5H7 l/2volt battery. If

unable to obtain locally, order direct from Merc-O-Tronic.

Be sure and specify type of battery required and serial number of unit.

Nevtsed J- l -6y

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OPER ATING IN sTR U CTIONS

For Model 98 Beginning with Seriol No.l5,O00

Before any attempt is made to use this instrument, read the following

instructions. They were prepared to enable those having only a minimum

of experience to test app repair the magneto ignition system equally as ,--.

well as the electrical specialist. Adhere to the instructions in sequence.

Do not jump from the first test to the fourth or the third to the fiffh, etc.

1. Your Merc-O-Tronic Magneto Analyzer is shipped with a dry battery

installed in the unit. Remove the 2 metal screws at the top of the

panel. This will allow the top to swing back, and you wiII notice

that the positive (red) battery lead is disconnected. Connect this

lead to the positive (+ ) post of thebattery. (When replacing battery,

make certain positive terminal is to right side of tester and that

terminal nuts are tight.)

2. t(Zerot' meter by turning the small adjustment scre'w on front of

meter until pointer hand lines up with zero on Scal.e No. 1, left side.

This is set at the factory, but should be rechecked.

3. To determine the battery life do the following: Move switch for volt

scale No. 1 to ((ON" position. Attach small black test lead to

negative and red small test lead to positive lugs on battery. Then

place selector switch on No. 1 position. (Red pilot will be on and

vibrator will be running). Read red figures on top of Scale No. 1.

Battery should check not less than 6.5 volts or proper readings

cannot be obtained. (Each division on volt scaie equals 0.5 volt).

For bench use this analyzet can be connected to an 8 volt

storage battery power supply. For 8 volts tap off 4 cells from a 12

volt storage battery.

4. Your Merc-O-Tronic Magneto Analyzer is now ready for use.

The following batteries can be used in place of Burgess 4F5H:

Eveready 715

Neda 903 Olin 5605

RCA VS139 Ray-O-Vac 903

Mallory M903

To check low OHM resistance values see page 20.

See Page 14 for Voltage Test Procedures.

CAUTION: DO NOT CONNECT TEST LEADS TOGETHER WHEN

SELECTOR SWITCH IS TURNED TO POSITION NO. 1 AS THIS IS

A DIRECT SHORT ON THE BATTERY.

FOR ALL TEST PROCEDURES INVOLVING SELECTOR SWITCHES

1 THRU 6 - VOLT SCALE SWITCH MUST BE IN ((OFF" POSITION.

5. To check condens.er leakage (on Scale No. 5) and condenser capacity

(on Scale No. 4), plug cord into 115-volt 60-cycIe AC electrical

outlet. This is the only time 115-volt 60-cycle AC is required. To

read, press red button, the electrical charge placed in condenser is

automatically discharged when releasing red button.

6. SPECIAL NOTICE: When checking Lauson Power Products Coils

#30546, 30560 and 29632 or any coil with internal condenser the

5 m.m. pot spark wiil appear fizzy. DO NOT let this fuzzy spark

mislead you. If spark is steady, coil is good,

PRIMARY COIL

GROUND

Figure 2

Figure 3

POINT ASSEMBLY

Figure 4

SPARK PLT'G

HIGH TENSION LEAD

SCREW }IOLDING CORE

TO STATOR PLATE

SPARK PLI.,,G LEAD

CONDENSER

BREAKER POINTS

ASSEMBLY

ARK PLI'G LEAD

cotL

PRIMARY OR + LEAO

.- PRIMARY

I GROUND TERMINAL

CONDENSER

+ MAGNETO HOUSING

CAM WIPER

SCREW FOR

COIL PRIMARY

GRC'UND LEAD

PRIMARY COIL |

-r

OR + LEAD

CONDENSER

LEAD

BREAKER POINT

TERMINAL SCREW

HIGH TENSION

CONNECTION

AOJUSTING SCREW TERMINAL SCREW

FOR CONNECTING

BREAKER POINT

ASSEMBLY

CONDENSER.ANO

COIL PRIMARY

LEAD.

ATTACH SINGLE

RED TEST LEA

ATTACH

SMALL BLAC

TEST LEAD

TO HOUSING

ATTACH SMALL RED

TEST LEAD TO COIL

PRIMARY

ATTACH

SMALL BLACK

TEST LEAD

TO HOUSING

PLACE PIECE

OF CARDBOARD

BETWEEN

BREAKER POINTS

ATTACH SMALL RED

TEST LEAD TO COIL

PRIMARY

REMOVE CONDENSER

TERMINAL SCREW

HERE AND SEPERATE

LEADS FOR THIS TEST

Figure 5

Figure 6

ATTACH SINGLE

RED TEST LEAD

COIL POWEF TEST

CONNECT SMALL

BLACK TEST LEAD

TO COIL PRIMARY

DISCONNECTING

coNoENsER coNNECT sM;i-L

REO TEST LEAO

#'l'X'"'lf-

Figvre 7

1. It is .not necessary to remove magneto

parts from stator Plate assembIY. Iy from engine or

Place a piece of cardboard between breaker poiifis to

Connect small black test lead to coil primary ground wire'

Connect small red test lead to coil primary lead or breaker point

assembly terminal.

Connect single red test,Iead to terminal of spark plug wire.

Alter wiring hookup is made, as'shown in illustrations 6 or 7, the

current control knob should be to extreme left,beyond "Lo" position.

Turn selector switch to position No. 1 ("Coil Power Test")'

Slowly turn current control knob clockwise and note the current value

on Scale No. 1.

when it reaches the operating amperage for'that particular winding,

shown in this manual under Manufaeturer's Specifications, stop and

note the 5 MM spark gap, lt should {ire steadily.

If the spark is faint, intermittent or no spark has occurred at this

reading, the coil is defective and must be replaeed' *\

If a steady spark. Occurs below Manufacturer's Specifications, this

indicates a very good coil. : '

10.

11.

CONOENSER

PLACE PIECE

OF CARDBOARO

BETWEEN

BREAKER POINTS

\\ \

\ \CoNNECT

\ SINGLE RED

\ TEST LEAD

\ HEFE

HIGH TENSION

COIL HIGH SPEED TEST

12. If the coil is good on Coil power Test, preceding, perform the High

Speed Test.

13. continue turning the current control knob clockwise to the right, for

maximum reading of met*.

14. The spark gap should fire steadily.

15. If the spark is faint, intermittent or no spark occurs, the coil is

defective at high speed and.must be replaced.

16. Complete this test as quickly as possible and immediately upon com-

pletion, turn selectot' switch and power control to ,'OFF" position.

On Fairbanks-Morse and similar Magnetos, it is necessary to remove

the distributor cap and end cap so single red test lead can be attached to

secondary terminal of coil "see Fig. 5". Small red test lead is attached

to coil primary lead after the lead has been removed from breaker point

terminal. The small black test lead is attached to housing "see Fig. 5".

When checking coil on stator plate with crankshaft type high inductance

rotating magnet (i.e. Wico, Scintilla and similar type magnetos), be sure

rotating magneto is in neutral position (magnets not opposite the coil

core).

NOTE: When testing coils off stator plate, it is absolutely necessary

that the laminated core be in the coil.

NOTE: On Fairbanks-Morse and

primary lead must be removed from

test. This also applies to all coils

laminations. See Figure 5.

similar type magnetos, the coil

breaker point terminal during this

which are permanently grounded to

Coils with Two (2) Secondarys Testing, see page 28.

Stator plate with 2 coils mounted, each coil to be checked separately

as noted in Fig. 7.

NOTE: AII coils should start firing 1 to 3 divisions before rated

specifications. Coils which first start to fire on "rated" specifications

are considered marginal and would give considerable trouble in starting

engine and should be considered as defective.

COIL SURFACE INSULATION TEST

CA R DBOAR D

Figure 8

1. Remove single red test lead from coil secondary, (High Tension lead)

see illustration Fig. 8.

2. Small red and black test ieads stay connected as previously.

3. PIug insulation test prob into "JACK" on front.of tester.

4. T\rrn selector switch to position No. 1.

5. T\rrn current control knob to "Hf" position for maximum current

reading on meter. "Do not exceed meter reading."

6. Pass end of insulation test probe over the insulating surface of the

coil and spark plug wires.

7. If coil insulation is cracked, leaking or damaged, a spark discharge

will be noted at the cracked or leaking surface.

8. Do not permit test probe to linger too long at any point while con-

ducting this test.

9. Completing test as rapidly as possible, as this is a severe test on a

coil.

A faint spark occurring around coil insulationduringprobing is a corona

spark and does not illustrate a defective coil.

PATENT PENDING

,. E"

U" t"" Powrn tEEt

COIL CONTINUITY TEST

CONNECT SMALL BLACK

TEST LEAD TO COIL

PRIMARY LEAD

CONNECT SMALL REO

TEST LEAD TO COIL CORE

Figure 9

NOTE: Scale 3 has two scales. The upper number is the number

shown on Mfg. specifications or are comparative numbers in place of

actual ohm resistance "lower numbers." This is an added feature to our

Iater model units starting with Serial No. 4050.

1. Turn selector switch to position No. 3 CoiI Continuity.

2. Clip small red and black test lead together.

3. T\rrn meter adjustment knob for scale No. 3 until meter pointer lines

up on set position on right side of scale No. 3.

4. Connect small black test lead to coil ground wire as in previous test.

5. Connect small red test lead to spark plug "high tension" lead.

6. Reading must be between the two values for that particular coil

shown in this manual under manufacturer's specifications.

7, Reading of actual resistance in ohms can be obtained by reading

Iower numbers in same scale.

8. Readings lower than the lowest value under manufacturer's specifi-

cations, the secondary winding is shorted.

9. Readings higher than the highest value shown in the specifications,

the secondary winding is open.

70. In either case, the coil is defective and must be replaced.

PRIMARY RESISTANCE TEST

CONNECT SMALL RED

TEST LEAD TO POSITIVE

PRIMARY LEAD ON COIL r"'fl7

CONNECT SMALL BLACK

TEST LEAD TO COIL

NEGATIVE PRIMARY LEAD

Figure 9A

1. Turn selector switch to position No. 2, Distributor Resistance for

checking low OHM resistance values.

2. Do not ctip test leads together. Turn meter adjustment knob for

scale No. 2 until meter pointer lines up on set position on right side

of scale No. 2. Your meter is now set to check atl low OHM values

from 0 to 30 OHMS.

3. Clip small red test lead to primary Positive side of coil.

4. Connect small black test lead to primary Negative side of coil.

5. ReadRed figures on Scale No. 2.

6. Reading must be between the two values for that particular coil

shown in this manual under manufacturer's specifications.

7. Resistance in OHMS can be obtained by reading Red numbers in

same scale.

8. Readings lower than the highest value shown in the specifications,

indicate the primary winding is shorted.

9. Readings higher than the Iowest value under manufacturer's specifi.

cations, indicate the primary winding is open.

10. In either case, the coil is defective and must be replaced.

COIL GROUND TEST

SMALL BLACK

TEST LEAD

CONDENSER

SINGLE RED

TEST LEAD

NOT USED

SMALL RED

TEST LEAD

Figure l0

Leave small black test lead connected as in CoiI Continuity Test.

Remove small red test lead from hieh tension wire and connect it to

ground or frame of stator plate. (See wiring hookup, Fig. 10.)

Turn selector switch to position No. 3 and read Scale No. 3.

The meter pointer hand must be on the "ZERO" line at the left.

Any meter movement to the right indicates a grounded coil.

If there is a meter pointer hand movement to the right, in#cating a

grounded coil, remove the breaker point terminal screw at "X" on

diagram Fig. 10.

7. Remove primary coil wire at this point. If the meter needle remains

to the right the trouble is elsewhere.

8. Check condenser for short or grounded breaker points.

NOTE: When coils are permanently grounded to lamination (i.e., Fair-

banks-Morse, Bendix-Scintilla), see illustration and similar type Fig. 11,

it is not possible to check for ground. This type of coil must indicate a

ground (movement of meter pointer hand to full right).

NOTE: When coils are not permanently grounded to lamination' it is

possible to check for ground. This type of coil must not indicate any

movement of meter pointer hand.

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