MSD 8457 Installation
Rotor and Rotor Base
for MSD Crank Trigger Distributors
with the Large Cap
PN 8457
Parts Included:
1- Rotor
1- Rotor Base
2- Screws and Belleville Washers
The Rotor and Base must be used with MSD Crank Trigger Distributors; PN 84697, 8558, 84997,
84698, 8448, 85691, 8569, 2340.
This Rotor and Base have been updated and will not interchange with the older style rotor or base.
To differentiate between the two, see Figure 1. The PN 8457 Rotor and base replaces rotor, PN 84597,
and base, PN 8465.
Note: The position of the new rotor on the base has also changed which means that the rotor
phasing must be reset.
Updated, PN 8457 Discontinued
The new rotor features a rotor tip that is
screwed down. The Base is notched to
accept the rotor tip screw boss.
This rotor does not have a screw
down rotor tip and the base is not
notched.
*pn 84597
Note difference in rotor
position-rotor phasing
must be adjusted.
*pn 8465
*these have been discontinued.
Figure 1 Updated and Discontinued Rotors and Bases.
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TECH NOTES
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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 warranty service, Proof of Purchase must be supplied for verification. After
the warranty period has expired, repair service is based on a minimum and maximum fee.
All returns must have a Return Material Authorization (RMA) number issued to them before
being returned. To obtain an RMA number please contact MSD Customer Service at 1 (888) MSD-7859 or
visit our website at www.msdignition.com/rma to automatically obtain a number and shipping information.
When returning the unit for repair, leave all wires at the length in which you have them installed. 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 using Ground shipping methods (ground shipping is covered
by warranty). For more information, call MSD Ignition at (915) 855-7123. MSD technicians are available from 7:00
a.m. to 6:00 p.m. Monday - Friday (mountain time).
Limited Warranty
M
SD IGNITION warrants this product to be free from defects in material and workmanship under its intended normal
use*, when properly installed and purchased from an authorized MSD dealer, for a period of one year from the date
of the original purchase. This warranty is void for any products purchased through auction websites. If found to be
defective as mentioned above, it will be repaired or replaced at the option of MSD Ignition. Any item that is covered
under this warranty will be returned free of charge using Ground shipping methods.
This shall constitute the sole remedy of the purchaser and the sole liability of MSD Ignition. To the extent permitted
by law, the foregoing is exclusive and in lieu of all other warranties or representation whether expressed or implied,
including any implied warranty of merchantability or fitness. In no event shall MSD Ignition or its suppliers be liable
for special or consequential damages.
*Intended normal use means that this item is being used as was originally intended and for the original application
as sold by MSD Ignition. Any modifications to this item or if it is used on an application other than what MSD Ignition
markets the product, the warranty will be void. It is the sole responsibility of the customer to determine that this item
will work for the application they are intending. MSD Ignition will accept no liability for custom applications.
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© 2007 Autotronic Controls Corporati on
FRM28563 Revised 04/07 Printed in U.S.A.
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