Quick Answer

You Asked How do you remove a fan clutch on a 12v Cummins?

Fan clutch removal trick – 5.9 Cummins

How does a diesel clutch fan work?

Thermal Fan Clutches

As the spring is heated, it turns and allows valve ports to open within the clutch. Silicone fluid stored inside a reservoir is allowed to pass through these open ports and enter the working area of the clutch. This engages the clutch and drives the fan.

What size is the fan clutch nut on a 6.7 Cummins?

Kit includes wrench that fits 48mm nut and fan hub pulley holder.

How do I know if my fan clutch is bad?

To confirm the diagnosis, start with this simple test: Spin the fan as hard as you can on an engine that has not been started that day. If the fan rotates more than five times, you can bet the clutch is bad. You should feel some resistance and the fan may spin up to three times, depending on the ambient temperature.

When should a fan clutch engage?

At what temperatures do fan clutches engage? Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature). They reduce the temperature about 20°F before disengaging.

Is a fan clutch necessary?

The fan clutch is one of the most essential components in the operation of cooling fans and greatly contributes to the overall operation of the engine. While many new vehicles use electric cooling fans, many older vehicles utilize a mechanical fan clutch to help control the fans.

What can a bad fan clutch cause?

Overheating engine is the most common symptom of a bad or failing fan clutch. It controls the operation of the cooling fans. These cooling fans will disable/not work at maximum efficiency as the bad clutch will not engage properly. This result in overheating which may lead to serious issues if not timely attended.

What does it sound like when a fan clutch is bad?

Whistling. A whistling or whining noise coming from the engine bay can be pretty serious. There’s a number of possible causes for the whistling noise, but one of the most common causes is a loose serpentine belt. When this happens, the fan clutch is not engaged properly.

How much does it cost to replace a fan clutch?

Radiator Fan Clutch Replacement Cost – RepairPal Estimate. The average cost for radiator fan clutch replacement is between $253 and $372. Labor costs are estimated between $84 and $106 while parts are priced between $170 and $266.

Should you be able to stop a fan clutch?

The fan is only activated when the engine is hot. You should not be able to stop it when hot. If so you need a new clutch.

How much resistance should a fan clutch have?


A good clutch should offer a certain amount of resistance when spun by hand (engine off, of course!). But if the fan spins with little resistance (more than 1 to 1-1/2 turns), the fan clutch is slipping too much and needs to be replaced.

What is a severe duty fan clutch?

A Severe Duty fan clutch will lock up 80 to 90 percent when engaged. An electronic fan clutch is a fan clutch that relies on the PCM to engage an electro-magnetic actuator on the clutch for engagement. This allows for a greater degree of control and accuracy over the engagement/disengagement of the fan clutch.

Is a clutch fan better than a regular fan?

Clutch fans are the right choice for stock or mildly modified engines. They will adequately cool the engine. Just be sure to use the fan and clutch designed for your application. Using the wrong parts could result in poor cooling, excessive noise, reduced fuel economy, and/or fan clutch failure.

Does the fan clutch affect the transmission?

Your transmission should not be affected however your truck will be slow and show a loss of power with a the fan locked up continually. (The roar should be driving you crazy) The only reason the tranny may be affected is if it down-shifts due to the loss of power when the fan goes into lock-up.

What controls the fan clutch?

A thermal clutch fan operates using silicon fluid as a viscous coupling medium. When the clutch is cool and disengaged, most of the silicon fluid is stored in the reservoir allowing your fan clutch to slip relative to your water pump shaft thereby spinning at a lower RPM than the water pump.