MSD 84085 Installation
MSD Rotor, PN 8423
Fits MSD Cap-A-Dapt, PN 8445 and PN 8441
also, MSD Distributors with Cap PN 8408
Parts Included:
1 – Rotor, PN 8423
2 – 5/8” Phillips Head Screws
WARNING: Disconnect the battery during installation. When disconnecting the battery, always
remove the negative cable first and install it last.
IMPORTANT: There are two different length screws supplied with this rotor. It is important to determine
which screws are correct for your application due to clearance of the magnetic pickup.
Remove the cap, rotor and the cap spacer and note the rotor screw retainer that is installed on the
bottom of the advance plate (Figure 1). There are two styles used; one is a Screw Retainer, the other
is a Retainer with a Nut. The Retainer accepts the shorter 5/8” screw while the Nut version accepts
the ¾” screw.
USE 3/4"
SCREW
ROTOR SCREW
RETAINING NUT
2 – 3/4” Phillips Head Screws
2 – Belleville Washers
USE 5/8"
SCREW
ROTOR SCREW
RETAINER
Figure 1 Determining Rotor Screw Length.
Note: It is recommended to install the rotor and check the
clearance before reassembling the distributor.
Once the rotor screw length is determined, install the rotor being
sure the round and square aligning pegs are lined up correctly. Install
the Belleville washers with the dome facing up on the screws and
tighten the rotor (Figure 2). Install the cap and plug wires.
Figure 2 Washer Installation.
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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 Contro ls Corpo ration
FRM28604 Revised 05/07 Printed in U.S.A.
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