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Old Sep 21, 2010 | 08:11 PM
  #1  
cornking's Avatar
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From: Mexico
Fan Clutch

What operating temp does the fan clutch engage?
 
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Old Sep 21, 2010 | 09:53 PM
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LCAM-01XA's Avatar
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IIRC it should be fully locked at 260F, of course by then your engine is done with for the most part. Is your truck overheating?
 
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Old Sep 21, 2010 | 10:06 PM
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if its failing you can repair it or some people like to swap to electic fans, others i've heard weld the fan so its always engaged fully
 
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Old Sep 21, 2010 | 10:36 PM
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From: Mexico
It is not overheating. I just drove the deserts of CA, AZ and Northern Mexico where it was 110+ outside. The truck ran at about 200-215. I never heard the roar I was expecting to hear.

I am guessing it is OK.
 
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Old Sep 21, 2010 | 10:59 PM
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Ensure the coil on the front of the hub is clean. (spring looking thing)

The hub engages in a curve, the hotter the air to it the harder it engages.
Kinda like slipping the clutch, the more you let the clutch out the faster you go until full engagement.

-Enjoy
fh : )_~
 
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Old Sep 21, 2010 | 11:21 PM
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From: Mexico
Originally Posted by Festus Hagen
Ensure the coil on the front of the hub is clean. (spring looking thing)

The hub engages in a curve, the hotter the air to it the harder it engages.
Kinda like slipping the clutch, the more you let the clutch out the faster you go until full engagement.

-Enjoy
fh : )_~
I am carrying a big truck camper on the bed in this heat doing some mountains too. The truck is running great.

Thanks everyone.
 
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Old Sep 21, 2010 | 11:47 PM
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Originally Posted by rhkcommander959
if its failing you can repair it or some people like to swap to electic fans, others i've heard weld the fan so its always engaged fully
Laugh all you want, but I get all the cooling I need and then some, and I still pull 20 mpg on the interstate - still think it's funny? By the way welding the fan is idiotic, it's a spin-on design that likes to spin off upon shutdown and fly into the radiator - I've locked my fan in a different way that ensures the fan stays put no matter what.

Originally Posted by cornking
It is not overheating. I just drove the deserts of CA, AZ and Northern Mexico where it was 110+ outside. The truck ran at about 200-215. I never heard the roar I was expecting to hear.

I am guessing it is OK.
Yup, she's all good - the fact you didn't hear the fan sound like a B-17 propeller simply means your radiator is in great shape and your EGTs were also kept in check.
 
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Old Sep 22, 2010 | 12:28 AM
  #8  
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Originally Posted by LCAM-01XA
By the way welding the fan is idiotic, it's a spin-on design that likes to spin off upon shutdown and fly into the radiator -
didnt even think about that man, good way to get off a stubborn fan lol. throw a quick weld on it, put a piece of plywood in between it and the radiator.... fire it up and shut her down lol.
 
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Old Sep 22, 2010 | 01:58 AM
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Originally Posted by LCAM-01XA
Yup, she's all good - the fact you didn't hear the fan sound like a B-17 propeller simply means your radiator is in great shape and your EGTs were also kept in check.
I'm curious ... How do EGT's and water temp correlate ...

-Enjoy
fh : )_~
 
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Old Sep 22, 2010 | 06:56 PM
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EGTs are direct result of combustion temperatures inside the chambers, and as I'm sure you're well aware some of that heat gets transferred into the engine block and heads and from there to the coolant - high EGTs mean high combustion chamber temperatures and so more heat being transferred to the coolant. You can have high EGTs for a short time without a noticeable effect on the coolant temp, but if you're pulling up a long grade your coolant temp will eventually rise as well - whether the cooling system can handle that or not is a whole different story tho.
 
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Old Sep 22, 2010 | 08:00 PM
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I replaced the fan clutch on the 6.9 motorhome and it locks in @ ~200* and stays locked in untill the temp gets back down to the t-stat (180*).

I been through hills in the desert in 110*F weather and never seen my real gauge go over 210*!

Rockies, climbing steep grades in 1st gear, sitting on the govenor doing 25mph for 10 min non stop..... never had a problem other than a ringing in my ears of being almost deaf from hearing a screamin' IDI. lol
 
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Old Sep 22, 2010 | 08:06 PM
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Originally Posted by LCAM-01XA
Laugh all you want, but I get all the cooling I need and then some, and I still pull 20 mpg on the interstate - still think it's funny? By the way welding the fan is idiotic, it's a spin-on design that likes to spin off upon shutdown and fly into the radiator - I've locked my fan in a different way that ensures the fan stays put no matter what.


Yup, she's all good - the fact you didn't hear the fan sound like a B-17 propeller simply means your radiator is in great shape and your EGTs were also kept in check.
How did you lock your fan?

I had a fan cutch lock in my old Jeep... sounded pretty neat. Like those old military Jeeps.
 
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Old Sep 22, 2010 | 08:40 PM
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Yea, Ok ... LCAM

IDIDieselJohn, You do not have a Ford Thermostat in that IDI ???

-Enjoy
fh : )_~
 
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Old Sep 22, 2010 | 08:44 PM
  #14  
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Originally Posted by oreocreaming
didnt even think about that man, good way to get off a stubborn fan lol. throw a quick weld on it, put a piece of plywood in between it and the radiator.... fire it up and shut her down lol.
One problem with that - fan clutch body is aluminum, shaft is steel, the only thing you could weld to would be the bearing race inside but to get to that you'd still need the fan off

Originally Posted by IDIDieselJohn
I replaced the fan clutch on the 6.9 motorhome and it locks in @ ~200* and stays locked in untill the temp gets back down to the t-stat (180*).

I been through hills in the desert in 110*F weather and never seen my real gauge go over 210*!

Rockies, climbing steep grades in 1st gear, sitting on the govenor doing 25mph for 10 min non stop..... never had a problem other than a ringing in my ears of being almost deaf from hearing a screamin' IDI. lol
Is what you use now a factory Ford clutch, or something aftermarket and labeled as heavy-duty? Its very possible the aftermarket folks realized made the thing lock up at lower temperatures...

Originally Posted by Otahyoni
How did you lock your fan?
I used two pieces of flat stock, and ran them from the water pump bolts to the actual blades of the fan. Gotta angle them right tho, cause if you don't the whole thing will be off balance and the vibrations will kill your water pump prematurely...
 
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Old Sep 22, 2010 | 08:54 PM
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All I know about fan clutches is that they are a pain to take off if you have never dealt with one before. lol mine is on good and tight, so tomorrow I will have to get an extra set of hands to help me out.
 
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