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Timing the Bendix or Slick Magneto

Sample Instructions for setting internal magneto timing. Use the current manufacturer's maintenance manual for specific instructions for your magneto. Information may not be current, complete, or accurate. 

Download Program Size Download Time 56.6K modem
Bendix D3000 magneto 275 KB 1 minute 11 seconds
Bendix S20 / S200 magneto 706 KB 3 minutes 4 seconds
Slick 4300/6300 series magneto 860 KB 3 minutes 44 seconds

These programs are a viewer program in .exe format. They are a stand-alone program that you download into the directory you want and then click to run. The program does not install any other programs nor does it change your registry. When you are thru with it just delete.

Additional information for timing Bendix and Slick Magnetos:

Slick Magneto FAQ's

Bendix Magneto FAQ's

Aircraft Magneto Troubleshooting

How to time the Continental Aircraft Engine Check out Continental Service Bulletin 94-8 or latest edition SB94-8

Slick 4300 magneto with timing pinWhere do I stick the timing pin?

Many mechanics estimate E gap  when setting the points on Slick magnetos. This results in each magneto set slightly different and causes a slight difference in RPM drop between magnetos when the pilot does the mag check.

 
Slick magneto with T-150 timing pin

Setting E Gap on Slick Magnetos

Newer Slick 4300 and 6300 magnetos use a 
T-150 tool to set E gap. The tool locks the rotor in the exact position that the points should open.
Slick magneto showing contact points and cam Slick magneto showing points and plastic cam follower
Slick magneto showing T-150 timing tool installed in rotor Slick E gap timing tool inserted into slot in rotor and against poll shoes. Now adjust the points to be just opening and you have the optimum point of magneto energy.

Note: many mechanics do not use this simple tool. They estimate E gap. Comparing this method with the tool shown above you can be off considerably. This may account for differences in rpm drop between magnetos when doing the magneto check.

11-8150-1 Timing Protractor used on Bendix Magnetos
11-8150-1 timing protractor

 

Bendix Magneto Rotation and Gear Marking

Bendix distributor gear

 

L & R refers to the direction of rotation of the rotating magnet as viewed from the drive end of the magneto.

red mark as follows:

S4LN CCW ARROWS
S4RN CW ARROWS
S6LN-200 OUTER BOOSTER CCW
S6LN INNER CW
S6RN INNER CW
S6LN-201 OUTER BOOSTER CCW
S6RN-200 OUTER CW
S6RN-201 OUTER CW
S-1200 4 CYLINDER counterclockwise rotating magnet L paint red
  clockwise rotating magnet R paint red
S-1200 6 CYLINDER counterclockwise rotating magnet L&LB paint red
  clockwise rotating magnet r&RB paint red
D4RN-3000 PAINT CW LINE
D6RN-3000 PAINT CW LINE
D4LN-3000 PAINT CCW LINE
D6LN-3000 PAINT CCW LINE
D8LN-3000 PAINT CCW LINE
 
 

 

 
 

 

 

 

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Disclaimer: sacskyranch.com contains abundant information relating to aircraft maintenance. The information provided  is not intended to supercede or supplement the F.A.A. approved  maintenance and/or operator’s manuals. Those F.A.A. approved manuals must be utilized when performing maintenance and/or operating aircraft.