Hello Sander, Thank you. I have changed the code but the problem persist:

f = 0 == 824.3733785446891` + (25 (16 + LL)^3)/390224 - (
    10625 (16 + LL)^3)/(
    97556 ((25 (16 + LL)^3)/390224 + 
       94.7740978646924` (aa/500 + (16 + LL)/116)^3 + 
       103.41515070822` (-(bb/200) + (16 + LL)/116)^3)) - (
    75819.27829175392` (aa/500 + (16 + LL)/116)^3)/((25 (16 + LL)^3)/
     390224 + 94.7740978646924` (aa/500 + (16 + LL)/116)^3 + 
     103.41515070822` (-(bb/200) + (16 + LL)/116)^3) - WI;
Manipulate[
 ContourPlot3D[Evaluate@f, {aa, -10, 10}, {bb, -25, 0}, {LL, 80, 100},
   AxesLabel -> {aa, bb, JJ}, PerformanceGoal -> "Speed"], {WI, 50, 
  200}]

Dear Moderation Team, Thank you for your recommendations.

Rodrigo