Fan clutch assembly removal - Chevy and GMC Duramax Diesel Forum
04.5-05 LLY Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 01-12-2010, 12:32 PM   eBay Motors  #1 (permalink)
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Fan clutch assembly removal

belt broke and took out several fan blades. wish to replace, cant seem to get the fan clutch off, left or right hand thread? also do you need special tool or can you use strap wrench? seems to spin with the belt assembley
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Old 01-12-2010, 12:42 PM   eBay Motors  #2 (permalink)
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If I remember correctly, it is left thread. [Right hand thread] The easiest way to get it off is using an air punch (or chisel if you don't have a punch). A two or three second blast on the edge of the nut will get her loose and it will spin off after that. Reverse the process to put it back on. Hope this helps.
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Old 01-12-2010, 01:09 PM   eBay Motors  #3 (permalink)
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It is right hand normal threads--

The pulley has a couple holes to place a spanner wrench. As stated aair chisel is the best to try to unscrew the threads.
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Old 01-12-2010, 01:21 PM   eBay Motors  #4 (permalink)
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My bad on the thread direction. It was back in the summer when I took the fan clutch off. Thanks for the correction.
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Old 01-13-2010, 10:26 PM   eBay Motors  #5 (permalink)
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There is a spacial tool you need to remove it. A air chisel will work as well.

Most auto parts stores like advanced will have them for rent.

GM G.M. Waterpump Hub Holder Fan Clutch Wrench Tools:eBay Motors (item 170431508501 end time Feb-11-10 09:38:55 PST)
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Old 01-13-2010, 10:31 PM   eBay Motors  #6 (permalink)
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I used a small spanner wrench and large crescent wrench, took a bit of yarding on it to finally break it loose with the 105k miles it had on it but it did the job.
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Old 01-14-2010, 07:55 AM   eBay Motors  #7 (permalink)
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Pipe wrench and a hammer. Sharp blow and spin it off.
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Old 07-09-2012, 05:04 PM   eBay Motors  #8 (permalink)
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old thead but i have another ?. I've taking the fan clutch off my 01 twice, once when i replaced flexplate, and another when i did the fpr.. And i cant remember which way to turn the darn nut.. the fan moves counter clockwise while looking from the front of the motor, so ive been trying to turn it clockwise. both times it came off pretty easy with the fan clutch holder, i just stick little bolts in the pulley and use that and a piece of steel i made to fit on the nut.. theres a little 3/8 coolant line that is leaking that connects to the pipe that goes from the thermostat housing to the pump and some other line and was hoping that i could replace it without taking that pipe off.
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Old 07-10-2012, 05:58 AM   eBay Motors  #9 (permalink)
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Nm i got it off, was turning it the wrong way..going to put an arrow of the tool for next time
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Old 07-10-2012, 06:15 AM   eBay Motors  #10 (permalink)
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Easy way to remember-- it unscrews the oposite way it normally turns.

If it was left hand-- it could come off when you drive the vehicle.
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