INSTALLATION AND OPERATION: CRANKFIRE AND ECONO CRANK UNITS

     Your new Crankfire Systems unit is a simple, rugged and reliable mechanism.  Please take the time to read this information and familiarize yourself with how and why these units work.  Doing so will allow you to achieve the best possible performance with them.

Mounting the unit on the gun:

     Both the Crankfire and the Econo Crank units are built using the same main housing and overall architecture.  Initial mounting and set up are the same.  Remove the two 8-32 button head alien screws on the top of the unit and slip the dust cover off.  Looking in the top of the unit, right where the rocker arm lifts the trigger actuator slide, you will see a 1/4-20 adjusting screw with a jam nut, on the top of the trigger actuator slide.  Using a 7/16 wrench, loosen the jam nut and back the adjusting screw out so that the rocker arm contacts the trigger actuator slide.  Remove the 1/4" ball lock pin from the bottom of the trigger actuator slide and slip the trigger roller out.  Remove the two 1/4-28 alien cap screws and the clamp cap from the main housing.  Position the unit on the buffer tube and replace the clamp cap and screws.  Leave the screws loose enough to allow the unit to be moved on the buffer tube.  Position the unit fore and aft so that the trigger actuator slide/trigger roller lines up directly under the trigger arc.  Twist the unit on the buffer tube so that the sides of the main housing are as nearly parallel to the receiver plates as possible. The unit housing is just a hair wider than the receiver, a small straightedge helps here. While maintaining this alignment, tighten the two 1/4-28 clamp screws securely.  When installing these two screws, run them in carefully and tighten them alternately and equally. They can bind up if everything isn't aligned properly. The buffer tubes are in theory supposed to be 1 1/4" in diameter, which is the size of the mounting clamp, and round. None of them are.  So on some the housing will drop around the tube easily, and on some it will have to be drawn down with the two clamp screws.  There should be enough crush allowance in the clamp to hold the unit securely in place (can't be twisted on the buffer tube).  At this point, check for clearance between the unit's front edges and the gun's back plate where the buffer tube intersects it.  It is best if there is at least a tiny bit of "daylight" here to insure that the main housing is not in a "bind" on the back plate assy.

Adjusting the Trigger Actuator Slide:

      Replace the trigger roller and the ball lock pin in the trigger actuator slide arms. There should be some space between the trigger roller and the trigger.  The amount of space will vary from one gun to another due to the different trigger shapes and tolerances of the individual gun components, even when all the components are theoretically identical.  To adjust this space, go back to the adjusting screw/jam nut on top of the trigger actuator slide.  Run the adjusting screw down until it bears on the rocker arm and lifts the trigger actuator slide and trigger roller enough to just touch the