Are You Demagnetizing Your Connecting Rods?

[Dibbons]

Today when I picked up my Mopar 340 connecting rods after having the rod bolts replaced and big end reconditioned at a Mexican diesel machine shop, I was told six of the eight rods required demagnetizing. I was not aware of this procedure prior to today. They took care of it at no extra charge.

 

[Kern Dog]

Uhhh....

 

[HEMIB]

We used to fit new bearing,s on the Deisel electric locomotives & used an induction type bearing heater to preheat the bearing for fitting ,similar to that magnetic flux crack to in the picture .You had to remove the bearing while the heater was still turned on with AC current flowing if you removed the bearing after the heater was turned off most of the time the bearing would end up becoming magnetized due to the heater being turned off at the peak of a half cycle which becomes DC

 

[j-c-c-62]

So the concern here is by being any amount of magnetic the con rod will attract metallics to the bearings and cause wear issues?

Really?

 

[DeltaV]

Today when I picked up my Mopar 340 connecting rods after having the rod bolts replaced and big end reconditioned at a Mexican diesel machine shop, I was told six of the eight rods required demagnetizing. I was not aware of this procedure prior to today. They took care of it at no extra charge.

Keeping with your machine shop's theme...did you have them demagnetize your crankshaft too?

 

[Photon440]

The Whys and Hows of Demagnetizing Engine Components

 

[Tony Tee]

I have a magnaflux tool and a de-magnetizer. But I'm having a difficulty locating a flux-capacitor especially in the 1.21 gigawatt range. You know, to go back in time and get factory fresh parts. Instead of having to get old parts restored. Sorry, I couldn't help myself. LOL !

 

[kiwigtx]

Still coming to grips with having to degauss my LCD flat panel TV screen.

 

[Photon440]

Still coming to grips with having to degauss my LCD flat panel TV screen.

I thought it was only the old cathode ray tubes that needed to be deqaussed.

 

[kiwigtx]

I thought it was only the old cathode ray tubes that needed to be deqaussed.

I was kidding.

 

[kiwigtx]

I use one of these often with my screwdrivers....

Very handy for creating a long magnet for picking up screws and swarf when working on electrical panels....and de-magnetising afterwards of course.
Electricians screwdrivers develop magnetism while working, so it pays to have one of these on hand.

Of course, the traditional method was to just give the end of the screwdriver a good thwack on a solid object.....usually gets rid of about 90% of the magnetism (seat of the pants measurement there)

 

[padam]

I use one of these often with my screwdrivers....

View attachment 1797585

Very handy for creating a long magnet for picking up screws and swarf when working on electrical panels....and de-magnetising afterwards of course.
Electricians screwdrivers develop magnetism while working, so it pays to have one of these on hand.

Of course, the traditional method was to just give the end of the screwdriver a good thwack on a solid object.....usually gets rid of about 90% of the magnetism (seat of the pants measurement there)

I’ve heard of bars getting magnetized during the steel making process, and they demagnetize them by whacking the end with a sledgehammer. I’ve never seen it done though.