Flexible lines must be installed with which slack?

Flexible lines must be installed with which slack?

• A. a slack of at least 10-12% of the length
• B. enough slack to allow maximum flexing during operation
• C. a slack of 5-8% of the length
• D. none of the above

Answer: (C)

Flexible lines must have some slack to absorb movement and thermal expansion so the line doesn’t become taut and stress the fittings. About 5-8% of the line’s length provides the right amount: it allows the hose to flex with engine motion, vibration, and heat without kinking or pulling at connections. Too little slack risks fatigue and rupture from tension; too much slack can cause sagging, rubbing, or snagging on nearby parts. The 5-8% range balances safe, flexible operation with neat, protected routing.

Flexible lines must have some slack to absorb movement and thermal expansion so the line doesn’t become taut and stress the fittings. About 5-8% of the line’s length provides the right amount: it allows the hose to flex with engine motion, vibration, and heat without kinking or pulling at connections. Too little slack risks fatigue and rupture from tension; too much slack can cause sagging, rubbing, or snagging on nearby parts. The 5-8% range balances safe, flexible operation with neat, protected routing.