8139MSD Datasheet, PDF (1/4 Pages) Mallory performance club – MSD 12 AMP Pro Mag Generator

MSD 12 AMP Pro Mag Generator
Chevrolet: PN 8139
Note: These Instructions are for the installation of the 12 Amp Pro Mag Generator and related
components only.
Note: On engines equipped with block mounted starters, a 16 volt battery is recommended.
MOUNTING
The Electronic Points Box can be mounted in any position, except
upsidedown. It should be kept clear of direct engine heat sources
such as the exhaust. Before mounting the box make sure the wiring
harness and coil wire reach the generator.
The Box is supplied with four ¾” vibration mounts. These mounts
are designed for lower levels of vibration over a long interval of
time such as experienced in circle track racing. Use a 3/16” drill bit
with these mounts (Figure 1). These vibration mounts are available
separately as PN 8823.
If your application experiences severe vibrations for a short duration,
such as tire shake from drag racing, PN 8822 Vibration Mounts
are required. These are 1” mounts and are designed for extreme
conditions.
Figure 1 Mounting the Points Box.
Note: To e n s u r e a g o o d g r o u n d p a t h f r o m t h e
Electronic Points Box, a ground wire should
be routed from the Points Box to the cylinder head of the engine. Use a #10 ring lug
connector with 16 gauge wire (Figure 3). The wires should be connected between
the Box and the retaining screw.
INSTALLING THE GENERATOR
The MSD Pro Mag cannot be used with the conventional “Buzzbox”
to set the timing prior to running the engine. Position the number one
cylinder to your desired timing. This will give you a good area to start
the engine and check the timing.
Note: The Pro Mag fires when the rotor tip is leading into the
distributor cap terminal (Figure 2).
When the generator is positioned at or near your desired timing, lock
down the housing and install the rotor, cap and spark plug wires.
Figure 2 Rotor Tip and Cap Alignment.
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