Flywheel Runout

[Colin Wilks]

Page A2-46. I also find it hard to find things in Woodrow. You see something then can never find it again. It says runout should not exceed 0.004" but then says many engines are over that. It then says if over 0.015" it should be reduced with a lower figure being desirable.

One thing to note that surprised me is some flywheels have a relieved taper where the middle section is lower than the ends. At first I thought something was wrong but that's normal for later flywheels apparently. Don't try to lap that away!

Simon

And now you've pointed that out I see it's at A1-39 as well! If I become immobile in my dotage I might attempt the creation of an index. 

So .015" is acceptable but the ideal is .004".