Posted for those folks that prefer to not read the P-MAG manual and may neglect the recommended maintenance.
Annual or 100 Hr. Inspection (whichever comes first):
1. Check E-MAG web site for most recent Service Notes (www.emagair.com
page “Service Notes”) and verify equipment is current with all updates.
2. Ignitions come with a (one-time trigger) thermal sticker that will trip (turn from light ash color to gray or gray/black) if case temperatures exceed 200 degrees (F). If tripped, review blast cooling and/or other ventilation issues that affect ignition cooling. Keep ignition temperatures below 200 degrees.
3. Ohm check plug wires (see “Ohm Check” above), and examine spark plugs for signs of unusual wear or build-up. Gap plugs per instructions above. Replace auto style plugs with new ones after 100 to 125 hours. When re-installing auto style plugs with auto plug adapters, review plug/adapter installation guidelines above.
4. Remove ignition and examine shaft and drive gear condition.
Note: Ignition disassembly is not necessary (and if done may void your warranty). Look for excessive play (lateral and axial). Shaft rotation should be free, with no catching, flat spots, or grinding. The shaft on “P” models (with internal alternator) will have a push-pull rippling effect as the shaft turns and the permanent magnets pass the rotor poles. This is normal and expected. If a P model ignition does not have this magnetic ripple, the unit requires additional (shop) service.
5. Replace older 1/16” cotter pins with larger 5/64” cotter pin.
Inspect and secure the ends to prevent movement. The smaller pins have been in service for some time, but we’ve have occasional reports of pins coming loose and/or breaking.
6. Examine control plug and coil plug connections. Tighten to 4-5 inch pounds. Verify there are no stray wire strands. Verify all control wires use the Adel clamp strain relief.
7. Reinstall the ignition, and verify proper operation. Review Setting Ignition Timing instructions above. For P models, re-verify minimum operating speeds when running on internal power (see Minimum Operating Speed test above.)
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1900+ hrs, New Titan IO-370, Bendix Mags
, Email: firstname.lastname@example.org
, Cell: 972-746-5154