Can i Re use Crank bearings

[dnoftz]

Ok so i got a motor I am building. It was just rebuilt by the kid before me and had less then 8hr of run time on it. the reason I got it was that it sucked the air filter nut down through the reeds and right in to the intake and busted the piston skirt. I got the bearing out and checked them they spin freely and I sprayed them good with brake clean to make sure there is no junk in there and sprayed them with WD40. Can I reuse them?

 

[blasterdemon7]

You can if there close to new and are 100% clean. Personally , I would get new bearings.

 

[EZRider76]

You can if there close to new and are 100% clean. Personally , I would get new bearings.

Agree^^^ You never know if they are 100% clean, there could be a burr or nick hanging out that will prematurely wear the bearing out. Better safe than sorry, the price of a bearing now vs. a very expensive rebuild later, you decide.

 

[Blaaster]

If you are considering re-using bearings you need to make sure they are scrupiously clean.
Wash in a container with fuel, not pre mix, and then blow dry with compresses air.

Spin the bearing by hand, without any lubricant, and you can then assess wether the bearing is servicable or not.

A word on WD40, never use it to lube bearings, it is a water dispersing, penetrating fluid and contains very little lubricating qualities.

Before installation drench in the 2 stroke oil of your choice.

 

[mjgnslngr]

A word on WD40, it is a water dispersing,


hence the name; WD

 

[Blaaster]

I work with electronics and I shudder when anyone tells me that they have used WD40 to lubricate the potentiometers on a piece of electrical equipment.

It is only a few months before the WD40 dries out and freezes the shaft of the potentiometer.

Beware WD40 is not a long term lubricant. Before it dries it will gather a large quantity of dust.

 

[EZRider76]

I work with electronics and I shudder when anyone tells me that they have used WD40 to lubricate the potentiometers on a piece of electrical equipment.

It is only a few months before the WD40 dries out and freezes the shaft of the potentiometer.

Beware WD40 is not a long term lubricant. Before it dries it will gather a large quantity of dust.

Huh, what do you know, I learned something. I thought the WD stood for the original chemist and it was his 40th concoction. I only use it for loosening things up and cleaning greasy stuff, if it doesn't work I go PB Blaster...even though I always ruin a shirt because of the splatter. X(

 

[mjgnslngr]

see, learn something new everyday! blaaster's right, after a while it does dry up. i use it on spark plug wires and tools but thats about it. good stuff when used right! PB Blaster is your friend for stubborn sh*t, last resort before i put the hot wrenches to it. 9 outta 10 times i dont even have to. besides, its got Blaster in the name so its a no-brain er!

 

[Budget_Blaster]

WD40 means water displacement and the 40 is the 40th attempt.

It was developed for space craft if memory serves correct.

As for the bearings its like this as far as im concerned...if youre already in there and youre replacing anything on the rotating assembly BUY new ones.These blaster engines are by no means hard to dsiassemble or work on but they are time consuming and for my time id rather replace them.Especially any time a motor grenaded it dont take much to ruin a bearing.

Your call here but if this is your pride and joy and you want it to last hell even if youre selling it do it right cheap assurance if you ask me.

Remember speed and longevity cost money how fast and how far do you want to go?