Engine/fan runout. what is ideal amount.

[Ripcord]

Can i ask what the limit of runout is ok at the fan.
Also the gauge i got was metric so i am not sure what the measurment should be,i read that a good start at Imperial is .002" ???? BUT no figure in metric.

[B727AV8R]

My gauge measures metric and inches. .002in on the gauge equals .05mm If you can keep your runout .002 or less you will be fine.

[Pinecone]

Ideal is 0.

[oteskate]

Yes, as Pinecone says, "ideal is 0", but for those that don't live in a world of perfect (which is usually me), I try to keep it below .003 at MAX. Generally I'm around .0005 - .002, which is acceptable IMO. I've heard of guys having it out by as much as .006 and still being fine.

[1VERTOL]

Suppose it is out of these limits. For someone who doesn't know how to dial indicate and fix an out of round fan, how do you do it??

[duckmansweb]

and if you do get runout , how do you correct it ?

[Pinecone]

It depends on the setup.

In my video, I show the tapping method. If it is a collet setup, you can also just rotate the hub 90 degress and see if that reduces the runout. You can do this 3 times, and pick the best one.

[hornet dave]

[ame]http://www.youtube.com/watch?v=nvzOayO2G58[/ame]

a poor video but gives you an idea how to do it.

ps - when you dial indicate, don't clamp your motor case in a way that will bend it, like I do in my video.