Slipping clutches can usually be verified by conducting a _________ test.

Slipping clutches can usually be verified by conducting a _________ test.

• A. Flow
• B. Stall
• C. Pressure
• D. Valve body

Answer: (B)

Slipping clutches show up when the clutch can’t transfer engine torque to the drivetrain as you accelerate. To check this, you load the clutch with engine torque and observe how the engine speed relates to movement. A stall test does exactly that: with the engine running, put the transmission in gear, hold the vehicle with the brakes, and apply throttle. If the clutch is gripping, the engine and wheels will respond together and the car will start to move or the engine will stall only if you push it to that limit. If the clutch is slipping, the engine speed will rise without a corresponding increase in wheel speed or movement—the engine revs higher but the car doesn’t accelerate as it should. The other tests don’t assess the clutch’s ability to transfer torque under load, so they won’t reliably reveal slipping.

Slipping clutches show up when the clutch can’t transfer engine torque to the drivetrain as you accelerate. To check this, you load the clutch with engine torque and observe how the engine speed relates to movement. A stall test does exactly that: with the engine running, put the transmission in gear, hold the vehicle with the brakes, and apply throttle. If the clutch is gripping, the engine and wheels will respond together and the car will start to move or the engine will stall only if you push it to that limit. If the clutch is slipping, the engine speed will rise without a corresponding increase in wheel speed or movement—the engine revs higher but the car doesn’t accelerate as it should. The other tests don’t assess the clutch’s ability to transfer torque under load, so they won’t reliably reveal slipping.