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AUTOTRONIC CONTROLS CORPORATION

 • 1490 HENRY BRENNAN DR., EL PASO, TEXAS 79936 • (915) 857-5200 • FAX (915) 857-3344

Limited Warranty

A

utotronic Controls Corporation warrants MSD Ignition products to be free from defects in material

and workmanship under normal use and if properly installed for a period of one year from date of
purchase.  If found to be defective as mentioned above, it will be replaced or repaired if returned prepaid
along with proof of date of purchase.  This shall constitute the sole remedy of the purchaser and the sole
liability of Autotronic Controls Corporation.  To the extent permitted by law, the foregoing is exclusive
and in lieu of all other warranties or representations whether expressed or implied, including any implied
warranty of merchantability or fitness.  In no event shall Autotronic Controls Corporation be liable for
special or consequential damages.

Service

In case of malfunction, this MSD component will be repaired free of charge according to the terms

of the warranty.  When returning MSD components for service, Proof of Purchase must be supplied for
warranty verification.  After the warranty period has expired, repair service is charged based on a minimum
and maximum charge.

Send the unit prepaid with proof of purchase to the attention of:  

Customer Service Department,

Autotronic Controls Corporation, 1490 Henry Brennan Drive, El Paso, Texas 79936

.

When returning the unit for repair, leave all wires at the length in which you have them installed.

Cutting wires close to the unit will void your warranty.  Be sure to include a detailed account of any
problems experienced, and what components and accessories are installed on the vehicle.

The repaired unit will be returned as soon as possible after receipt, COD for any charges.  For more

information, call the MSD Customer Service Line (915) 855-7123.  MSD technicians are available from
8:00 a.m. to 5:00 p.m. Monday - Friday (mountain time).

FRM11992

REVISED 01/95

PRINTED IN U.S.A.

TECH NOTES

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Summary of Contents for 8485

Page 1: ... is the base timing of the engine before centrifugal advance begins Centrifugal Advance The centrifugal advance mechanism is made up of weights springs advance cam and an advance stop bushing The amount and rate of advance that your distributor is capable of is determined by the centrifugal timing If you ever wish to lock out the centrifugal advance refer to the centrifugal advance section Total T...

Page 2: ...g guideline can be found Engines with a combination of items from both columns will require a timing that is set in the mid range Obviously a full technical explanation of correct ignition timing would be very complicated The best way to arrive at a suitable ignition curve for your engine is to use the Ignition Timing Factors Chart as a guide and compare it to the Advance Graphs in Figure 2 until ...

Page 3: ...ings and the advance stop bushing There is no need to change the weights or advance cam SELECTING THE ADVANCE SPRINGS The rate or how quick the advance comes in is determined by the type of springs which are installed on the distributor The MSD distributors are equipped with two Heavy Silver springs installed These will give you the slowest advance curve possible The parts kit contains two additio...

Page 4: ... Using long needle nose pliers remove the springs from the spring posts 3 Install the new springs using the pliers and install the rotor and cap SELECTING THE ADVANCE STOP BUSHING Three different advance stop bushings are supplied in the distributor kit The distributor comes with a Blue 10 5 bushing already installed If a different amount of centrifugal advance is desired follow the next procedure...

Page 5: ...ut Figure 5 Changing the Advance Stop Bushing LOCKING OUT THE CENTRIFUGAL ADVANCE 1 Remove the roll pin from the drive gear and remove the gear from the shaft 2 Remove the advance springs weights and the advance stop bushing from the advance assembly 3 Slide the shaft two inches out of the housing 4 Rotate the shaft 180 and insert the advance stop bushing pin into the small hole on the advance pla...

Page 6: ... Screw the nut onto the clamp stud and finger tighten Locate the supplied shims and set one 0 010 shim aside 7 With the remaining shims make a stack that fits the gap between the clamp and the distributor housing Figure 8 It is recommended to use a shim stack that is slightly thicker than the gap up to 0 005 however it may be 0 002 thinner 8 Remove the distributor then remove the clamp and collar ...

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Page 8: ...nstalled Cutting wires close to the unit will void your warranty Be sure to include a detailed account of any problems experienced and what components and accessories are installed on the vehicle The repaired unit will be returned as soon as possible after receipt COD for any charges For more information call the MSD Customer Service Line 915 855 7123 MSD technicians are available from 8 00 a m to...

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