Nylon cam gear years

[77Dmax]

Please post an update as to how well the clutch functions along with a part number. I've replaced several before and usually they don't disengage.

 

[ASPEC]

Please post an update as to how well the clutch functions along with a part number. I've replaced several before and usually they don't disengage.

Hayden 2797 severe duty. I will post an update as soon as it has enough in service time.

 

[ASPEC]

I've replaced several before and usually they don't disengage.

Make sure when using a heavy duty or severe duty fan clutch that your fan is compatible. If your fan is has less than a 3" blade or not enough pitch it will not produce enough drag to disengage the clutch and may not pull enough air to cool the clutch.

 

[bucket]

Make sure when using a heavy duty or severe duty fan clutch that your fan is compatible. If your fan is has less than a 3" blade or not enough pitch it will not produce enough drag to disengage the clutch and may not pull enough air to cool the clutch.

Well dang, that's something that I have not ever considered.

How much pitch would you say is needed for a "severe duty" type clutch? Generally speaking, of course.

 

[Goldie Driver]

Well dang, that's something that I have not ever considered.

How much pitch would you say is needed for a "severe duty" type clutch? Generally speaking, of course.

Stumbled across this post the other day. Can't tell you the pitch but it may help you ID the fan.

https://www.airforums.com/forums/f310/radiator-fan-clutch-woes-155571.html#post1866681

Scroll up for the full thread.

 

[ASPEC]

Well dang, that's something that I have not ever considered.

How much pitch would you say is needed for a "severe duty" type clutch? Generally speaking, of course.

Here is some info from Hayden:

All fan clutches are for specific applications and should be applied only on the vehicle for which they are cataloged. Use of the incorrect fan clutch may result in poor cooling, excessive noise, reduced fuel economy or fan clutch failure.

• Standard Duty Thermal: Turns the fan 50-60% of shaft speed when engaged. Used with fans with lighter pitch (1-1/2" of pitch). Flat plate impeller design with 30 sq. in. of working surface.

• Heavy-Duty Thermal: Turns the fan 80-90% of the shaft speed when engaged for increased cooling. Used with deeper pitch fans (2 1/2" of pitch). Land and groove design with 47 sq. in. of working area allows higher operating RPM's.

• Severe Duty Thermal: Turns the fan 80-90% of the shaft speed when engaged. Used with deeper pitch fans. (2- 1/2" of pitch). Land and groove design with 65 sq. in. of working area. Larger working surface provides cooler running and longer life expectancy.