How to change fan speed with adjustable pulley?

Divide the 6000 CFM by 5100 CFM to find the ratio of airflow increase. Notice the airflow should increase 17% for the fan to deliver the required airflow. Then multiply the pulley belt diameter of 5.5-in. times 1.17 to find the new belt diameter of 6.44-in.

How to install a new serpentine belt, fan belt or?

With clear access to your pulleys, you can now install your new serpentine belt. Remember to align the grooves of the belt with the grooves of your pulleys.

What’s the best way to remove an alternator pulley?

To remove the alternator pulley, use a 1/2″ Drive impact wrench to loosen the nut. Most automotive Alternator pulleys use a 15/16 socket. Hold the alternator pulley firmly.

How does the belt tension on a fan work?

Belt tension is normally adjusted by loosening the motor mount bolts and sliding the motor closer or farther away from the fan. Ideally when a 10 PSI pressure is placed between the pulleys on the belt, the belt deflection should equal the distance between the centerline of the pulleys divided by 64.

To remove the alternator pulley, use a 1/2″ Drive impact wrench to loosen the nut. Most automotive Alternator pulleys use a 15/16 socket. Hold the alternator pulley firmly.

What happens when you adjust the belt on a drive pulley?

In practice, adjusting a sheave to get a belt to ride lower (closer to the shaft) or higher (further from the shaft) won’t usually result in huge airflow changes, but it will have an impact. The main thing to know when adjusting an adjustable drive pulley is:

Where can I find a drive belt tensioner and pulley guide?

Can you adjust the tension on a belt?

If you want to adjust belt tension, you can generally do that by adjusting the motor mount, using the tension adjustments made for that purpose. Belt tensioning and belt replacement is a part of regular maintenance; adjusting sheave halves isn’t.

Do you lose cooling air with power pulley?

At first, losing 15% of the cooling air seems like a large sacrifice to make for the slight increase in power that the power pulley provides, but this quote of 15% loss of cooling air is not an accurate indication of the effect on the cooling of the engine.

Why are pulleys attached to the shaft of a fan?

Start the system and measure to verify expected airflow is being delivered. When attaching pulleys to the shaft, care must be taken to align both pulleys in a straight line to each other. This will increase power transmission and reduce wear and tear on the belts and the pulleys, extending the life of both.

What should I do if my fan clutch is not working?

More likely, you’re going to have to remove the shroud. This means draining some coolant, disconnecting the upper radiator hose and sometimes removing the belt. If the clutch is held to the belt pulley hub by screws or bolts, use a plumber’s strap wrench to keep the pulley from turning while you loosen the screws.

How to change fan speed with adjustable pulley?