On a flare tube, how much play exists at the rod end?

• A. 1/128 inch
• B. 1/64 inch
• C. 1/32 inch
• D. 1/16 inch

Answer: (B)

The amount of end play at the rod end is a small clearance built into the rod-end bearing to allow for slight movements, wear, and alignment changes without causing binding. In a flare tube assembly, this lash needs to be just enough to accommodate normal operating tolerances and lubrication, but not so loose that the joint becomes unstable.

The best value for this end play is one sixty-fourth of an inch. This small clearance provides proper freedom of movement as the tube and rod articulate, helping to prevent binding and excessive stress that could lead to wear or fatigue. If the play were greater than this, it would indicate wear or looser joints, compromising control linkage alignment; if it were tighter, the joint could bind or resist motion, especially with temperature changes and dynamic loads.

To check it, inspect the rod end with the system in a neutral position and gently push and pull to feel the slack, or use a suitable measuring tool to verify that the end play is approximately 1/64 inch.