PN 8580 MSD Ford Billet Distributors Instruction Manual

PN 8580 MSD Ford Billet Distributors

MODELS

• PN 8473: 2.3L,
• PN 8580, PN 85801: 351C, 351M, 400, 429, 460
• PN 8582, PN 85827: 289, 302 PN 8584: 351W
• PN 85805: 351W w/Edelbrock Victor Jr. Intake

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Important: Read these instructions before attempting the installation.

Note: An MSD Ignition is required with this Distributor.

Parts Included

• 1 – Billet Distributor
• 1 – Rotor
• 1 – Distributor Cap
• 1 – Advance Kit
• 1 – Tube of Gear Lubricant
• 1 – O-Ring

WARNING: Before installing the MSD Distributor, disconnect the battery cables. When disconnecting the battery cables, always remove the Negative (-) cable first and install it last.

_ Note: _These distributors must be used with an MSD Ignition Control.

TIMING FUNCTIONS

Before continuing with the installation, here are a few definitions you should be aware of:

Initial Timing : This is the base timing (also referred to as idle timing) of the engine before the centrifugal advance begins.

Centrifugal Advance: The centrifugal (or mechanical) advance mechanism is made up of weights, springs, advance cams, 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 Timing: This is the total of the initial timing plus the centrifugal advance added together.

Example: 10° Initial + 25° centrifugal = 35° Total Timing.

Note: MSD Distributors are supplied with the heavy (slow) advance springs installed. This is to prevent detonation in certain applications. Review the information on pages 2-4 to determine the best advanced curve for your application.

CHOOSING AN ADVANCE CURVE

The function of the advance curve is to match the ignition timing to the burning rate of the fuel and speed (rpm) of the engine. Any factor that changes the burning rate of the fuel or the engine speed can cause a need for an ignition timing change. Figure 1 shows some of the factors that will affect engine timing.

As you can see from the chart, most factors will change throughout the range of the engine operation. The timing mechanism of distributor must make timing changes based on these factors.

Example: An engine has 11:1 compression with a high energy ignition. With the specifications given, you will have to retard the timing for the high compression and high energy ignition. By comparing the engine’s specifications against the chart, a usable timing 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 4 until a suitable curve is found.

When selecting your advance curve, use detonation (engine ping) as an indicator of too much advance, and a decrease in power as an indicator of too little advance.

TIPS ON SELECTING AN ADVANCE CURVE

• Use as much initial advance as possible without encountering excessive starter load.
• Start the centrifugal advance just above the idle rpm.
• The starting point of the centrifugal advance curve is controlled by the installed length and tension of the spring.
• How quickly the centrifugal advance (slope) comes in is controlled by the spring stiffness. The stiffer the spring, the slower the advance curve.
• The amount of advance is controlled by the advance bushing. The bigger the bushing, the smaller the amount of advance.

CENTRIFUGAL ADVANCE CURVE

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 (Figure 2). The parts kit contains two additional sets of springs which can be used to match the advance curve to your particular application. Refer to the Spring Combination Chart (Figure 3) for combinations that can be achieved.

To change the springs, remove the cap and rotor and use needle nose pliers to remove the springs. Be sure the new springs seat in the groove on the pin.

SELECTING THE ADVANCE STOP BUSHING

Five different advance stop bushings are supplied in the distributor kit. The distributor comes with a Blue (21°) bushing already installed. If a different amount of centrifugal advance is desired, follow the next procedure to change the bushings. The chart in Figure 5 gives the size and approximate degrees for the corresponding bushings.

CHANGING THE ADVANCE STOP BUSHINGS

1. Remove the distributor cap and rotor.
2. Remove the locknut and washer on the bottom of the advance assembly (Figure 6).
3. Remove the bushing and install the new one. Install the washer and locknut.

LOCKING OUT THE CENTRIFUGAL ADVANCE

1. Remove the cap and rotor.
2. Remove the advance springs, weights and the advance stop bushing from the advance assembly.
3. Remove the roll-pin from the shaft and slide the retaining sleeve down. It should not be necessary to remove the gear (Figure 7).
4. Slide the shaft two inches out of the housing.
5. Rotate the shaft 180° and insert the advance stop bushing pin into the small hole on the advance plate (Figure 8).
6. Install the locknut and washer to the advance stop bushing pin.
7. Install the retaining sleeve and roll-pin.

INSTALLING THE DISTRIBUTOR

1. Remove the existing distributor cap without disconnecting any of the spark plug wires.
2. With the cap off, crank the engine until the rotor is aimed at a fixed point on the engine or firewall. Note this position by making a mark (Figure 8).
3. Place the distributor cap back on and note which plug wire the rotor is pointing to. MARK THE SPARK PLUG WIRES and remove the distributor cap.
4. Disconnect the wiring from the distributor.
5. Loosen the distributor hold down clamp and slide the clamp out of the way.
6. Lift the distributor out of the engine. Note that the rotor rotates as you lift the distributor out. This is due to the helical cut gear and should be taken into consideration when installing the new distributor.
7. Install the new O-ring and apply a liberal amount of the supplied lubricant to the distributor gear.
8. Install the distributor making sure that the rotor comes to rest pointing at the fixed mark. If the distributor will not fully seat with the rotor pointing to the marked position, you may need to rotate the oil pump shaft until the rotor lines up and the distributor fully seats.
9. Position and tighten the hold down clamp onto the distributor.
10. Install the distributor cap and spark plug wires one at a time to ensure correct location.

WARNING: High voltage is present on the coil terminals. Do not touch the terminals or coil tower when the engine is cranking or running.

REPLACING THE DISTRIBUTOR GEAR

To replace the distributor gear on the MSD Distributors, the following steps must be followed.

1. Remove the original spiral pin with a punch and press the original gear off the shaft. Press the new gear onto the shaft and line up the holes for the spiral pin. Note: The holes may not line up.
2. If the holes line up, measure the distance as shown in the diagram. If the measurement is not correct or the holes do not line up, a new hole must be drilled. If the measurement is within specifications and the holes line up, install a new spiral pin.
3. To drill a new hole, turn the gear on the shaft so the gear hole is approximately 90° to the original shaft hole. Carefully position the gear on the shaft to match the specifications given in the drawing.
   • Note: Before measuring, push the shaft in to remove all of the end play.
4. When the gear is in the correct position, drill a 0.125” hole through the distributor shaft. Install a new spiral pin and recheck the measurement.

Note

• If the measurement is not within specifications after drilling, a slight correction can be made by machining the upper face of the thrust collar. Do not remove more than 0.010” or rotor-tocap interference may result.
• PN 85827 uses a Bronze Gear.

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 1 866-464-6553 or visit our website at www.msdperformance.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 at 915-855-7123. MSD technicians are available from 7:00 a.m. to 5:00 p.m. Monday – Friday (mountain time).

Limited Warranty

MSD 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. 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. 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 MSD 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. Any modifications to this item or if it is used on an application other than what MSD 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 will accept no liability for custom applications.

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References

• Holley
• Holley Product Registration - Holley
• Holley Help Center

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