Magnetic Plug Debris

What oil are you using?  Oil needs correct additives for heavy shear caused by gears.  Use either AeroShell Sport Plus 4 or Mobil1 Racing 4T SAE 10W-40 Advanced Full Synthetic Motorcycle Engine Oil.  I use Mobil1 4T and have 800TT with little to no metal particles on magnetic plug...

I use AeroShell Sport plus 4

It appears that there is an excessive amount of material present. Can you please provide information on when the gearbox maintenance was last conducted, including the number of hours since it was done and who performed the maintenance? Additionally, do you know how many hours have passed since the magnetic plug was last inspected? If you are uncertain about your findings, Rotax recommends following these steps:

1. Clean the magnet with solvent and re-check (the contamination could be from the engine assembly).
2. Flush the oil circuit.
3. Cut open and inspect the old oil filter and replace it with a new one.
4. Install the magnetic plug. Refer to Chapter 12-20-00 for instructions on installing the magnetic plug.
5. Test run the engine. Refer to Chapter 12-20-00 for instructions on testing the engine.
6. Re-check the magnetic plug once more.

https://www.rotax-owner.com/pdf/MML_912-Series_Ed4-Rev1.pdf

https://www.rotax-owner.com/pdf/MMH_912_914_Ed2.pdf

If there are larger accumulations of metal chips on the magnetic plug, the engine must be repaired or overhauled in accordance with the BRP-Rotax instructions for continued airworthiness.

Gearbox was inspected on 3/4/20230 by me. So far tach shows 64.2 hours since the gearbox inspection. I cut open the filter and its clean, no metal. Last check on the magnetic plug was on 2/28/2023.

Hello Luis,

I have a few questions that I would like to clarify with you:

• When did you first examine the Magnetic plug (hours), and how did it appear at that time?
• At what interval (hours) did you conduct the second inspection of the magnetic plug?
• Around 64.2 hours ago, you performed a gearbox inspection. Is the material visible in the photo a result of buildup since that inspection?
• Have you done a gearbox "friction torque" test following the disassembly and inspection of the gearbox?

Magnetic Plug Insection - https://www.rotax-owner.com/en/videos-topmenu/expanded-video-instructions/295-magplug

Locking the Crankshaft - 912 /914 Series - https://www.rotax-owner.com/en/support-topmenuenu/free-videos/245-lock147

Propeller Gearbox Removal & Replacement - https://www.rotax-owner.com/en/videos-topmenu/elearning-videos/298-gearbox184

Friction Torque - https://www.rotax-owner.com/en/videos-topmenu/elearning-videos/60-friction-torque29