Help me with middle gear back lash

[mmaleney]

So to make a long story short I am instaling a different middle gear in my 88 venture, so I wanted to know when the back lash is to be checked in 4 different places should I have the very same back lash # in all 4 places or can I be any where from the min to the max setting as given in the book, because it looks like there can be 2 shimes on one side and 1 on the other, And if I was to use that blue dye to check my work would that work on the way the venture is set up Thanks.

[dingy]

I don't think you should use different shims combination on the two sides. The faces should be machined perpendicular to the axis on each mating surface. The shimming process is to compensate for machining tolerance variations between parts. Helical cut bevel gears are a tough item to machine so there is going to be an acceptable manufacturing tolerance to keep the cost within reason. The way to then compensate for a reasonable tolerance is to shim the parts.

 

I do see the part about checking it at 90 deg points which would seem to indicate there could be an axial run out, but I do not see any mention of compensating for this by staggering the shim pack make-up. By checking the 90 deg quadrants, a worn bearing or bent shaft may become apparent.

 

I attached the 86-93 cut for the middle drive gear setup if anyone would like to read it and comment.

 

Gary

[mmaleney]

Well the good news is I got it to hold the same back lash all 4 times so lets call it done, Now on to the valves.