So i was looking ways to clean brushless motor of my quadcopter and i came through this video.

Is this method safe and will the bearings of the motor be okay?

bearings will be okay, but you'll have to re lubricate them with the appropriate kind of lubricant.

What kind of lubricant will be required?.And if we have to lubricate them do we have to open the motor?

Quote from: ghoshatanu56 on February 04, 2017, 04:46:33 AM
What kind of lubricant will be required?.And if we have to lubricate them do we have to open the motor?

After cleaning with isopropyl and drying,
Spray with WD40 to get rid of any water content in the iso.
Dry.
No need to open the motor to lubricate.
If your lube bottle doesn't have a fine nozzle (needle type), get a small syringe.

I use Scorpion motor bearing oil. It's very thin and lasts a long time.
Still have half of my 30ml bottle after 4-5 years.
Quite expensive. I think I paid Rs450 to adiboy (forum member but not active) who used to get all my reqmts from hobbyking till a few years ago...

Singer machine oil (a far cheaper alternative) may be ok, though it is for somewhat heavier duty.

Pics

Thanks K K Iyer sir for clearing my doubts

The oil is useful if the bearings are open (unshielded)

Nowadays, most bearings are packed with grease, then shielded. There can be 2 metal (ZZ) 2 Rubber (RS) or one Rubber and one Metal. In rare cases (for special applications, a single seal is used.

It is a waste trying to lubricate a shielded bearing with oil.

All the bearings I have seen in brushless motors were shielded

So what shold be done sanjayrai sir if bearings are shielded.will the bearings lose grease if we clean motor using this method

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Possibly, yes. The grease could be affected by the cleaning

But why would you want to clean a Brushless motor so aggressively?

Just blow through it if it collects dust. Worst case, wash it in running water under a tap, and let dry in the sun

+1 👍🏼

Quote from: sanjayrai55 on February 05, 2017, 05:55:16 AM
The oil is useful if the bearings are open (unshielded)
Nowadays, most bearings are packed with grease, then shielded.
It is a waste trying to lubricate a shielded bearing with oil.

I guess my 20+ motors (Turnigy, DYS, EMax, Deltron etc) may be cheapos, as not a single one has a shielded bearing. Don't have an NTM, maybe they have shielded bearings.

So I'm happy with the occasional mini drop of my Scorpion bearing oil...

Thorough cleaning is rarely required, only if dirt is ingested.

Quote from: sanjayrai55 on February 05, 2017, 05:17:44 PM
Worst case, wash it in running water under a tap, and let dry in the sun

Then WD40, and a wee drop of oil 

So, are your bearings shielded or not?

The DYS, Turnigy and NTM that I have had cause to open all had shielded bearings

Almost all of mine are small, below 300 watts.
Perhaps that's why.

Possibly. The smallest I've opened was a 2836