Originally posted by Swift1 A magnet and filings of some sort.
Oil pan drain plug?
Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding! Ding!
Winner! Chicken dinner!
Pretty close.
It is indeed a magnet, with filings.
But it was inside the back rear differential housing on a class 8 semi truck tandem drive that I worked on. They also have magnetic drain plugs, but also a magnet about 1" x 3" glued inside the housing.
The driver tore up the center sections after a few too many miles of abuse, and I got the pleasure of removing the gearsets, cleaning the housings and installing freshly rebuilt gear sets.
When I looked inside the housing after removing the gearset and saw this, I just had to take a picture, so I grabbed my camera and took a few shots.
This is what the drive axle setup looks like:
Big stuff.