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Fan Clutch Removal/Install????

It's been awhile....How do I lock up the pulley to spin off the fan clutch? I see small holes in the pulley. Do I shove in like a short screw driver and lock it up against the water pump?
 
There is a special tool for that.... Most of the chain parts stores rent the fan clutch wrenches to make it easy.

Sometimes you can pop the clutch loose with just the tension of the belt holding the WP pulley.
 
On my Jeep (same type of thing), (my truck has the bolt on unit), there is a special thin wrench you buy, its about 25 bucks from napa. Put it on and give it a quick tap with the hammer it will spin right off..
 
1 7/8 wrench and a BFH. I had one that would not come off. I had to torch the SOB off and then file down the nut to get a socket on it and use an Impact gun. PO might have used locktite or sumthin. Never had to do that before..
 
Big T said:
It's been awhile....How do I lock up the pulley to spin off the fan clutch? I see small holes in the pulley. Do I shove in like a short screw driver and lock it up against the water pump?
Click to expand...

I did that but was only able to after i torched the clutch off. You can't really get a screwdriver in there with the clutch and even if you find one short enough it will probably bend. It should not be that tight hopefully...BFH and method of Impact...:D
Hopefully you won't have to do it this way...(Post 10)
http://www.thetruckstop.us/forum/sh...pump-vs-GM-one&p=360741&viewfull=1#post360741

Also even though you do not have to remove the rad, getting the hub to thread back on is a PIA sometimes and you may drop the fan and clutch so I strongly recommend a duct taping a piece of old thick cardboard over the rad as a cushion...experience talkin here...ask me how I know...:suicide:
 
DieselSlug said:
On my Jeep (same type of thing), (my truck has the bolt on unit), there is a special thin wrench you buy, its about 25 bucks from napa. Put it on and give it a quick tap with the hammer it will spin right off..
Click to expand...

Does this "thin wrench" lock into the four holes of the pulley? If so then I would also need a wrench on the fan clutch nut.
 
BTW, Chief915...you had mentioned being a Mil Mechanic and working on Humvees...I would love to see some detailed pics of the clutch setup they use. I was told it's hydraulic but I have never seen it. Can they be engaged manually ? Serp belt or V ?? CW or CCW ?
 
Big T said:
Does this "thin wrench" lock into the four holes of the pulley? If so then I would also need a wrench on the fan clutch nut.
Click to expand...

Yes on both accounts. You will end up using two wrenches at the same time, one that holds the pulley still and the other grabs the fan clutch and loosens it.
 
Acesneights1 said:
BTW, Chief915...you had mentioned being a Mil Mechanic and working on Humvees...I would love to see some detailed pics of the clutch setup they use. I was told it's hydraulic but I have never seen it. Can they be engaged manually ? Serp belt or V ?? CW or CCW ?
Click to expand...

No problem, start a new thread on this and I will post pics and talk about how it works. Don't want to hi-jack this thread.
 
Chief915 said:
Yes on both accounts. You will end up using two wrenches at the same time, one that holds the pulley still and the other grabs the fan clutch and loosens it.
Click to expand...

Is that a Kent Moore tool ? I'm trying to picture what it would look like What does it use like 3 of the give holes or something ? Sort of U shaped ?
 
Chief915 said:
Yes on both accounts. You will end up using two wrenches at the same time, one that holds the pulley still and the other grabs the fan clutch and loosens it.
Click to expand...

Is that a Kent Moore tool ? I'm trying to picture what it would look like What does it use like 3 of the give holes or something ? Sort of U shaped ?
 
Acesneights1 said:
Is that a Kent Moore tool ? I'm trying to picture what it would look like What does it use like 3 of the give holes or something ? Sort of U shaped ?
Click to expand...

Kenny here are the tools from NAPA:

FanClutchRemovalToolandWrench.jpg


Package said for 6.9 and 7.3 Powerstroke fan clutch removal. In fact, I did have to do a little grinding as the cut outs would not quite enough to allow the pins to lock into the holes on the pulley hub:

FanClutchRemovaltoolMod.jpg


Had to grind those curves deeper and wider in front of each pin. Once it fit, it was a piece of cake to remove with the wrench. No BFH required.

I did have to grind away the rib around the bottom of the fan shroud. Guess my engine/tranny mounts are a bit compressed after 168K miles. I used a grinder and a wire wheel.

Here's the old 20" Steel 9 Blade:

20inchSteelFan.jpg


I'm on to the Dmax plastic now.

Now off to get the truck some new tires. While coming home from Big Bear yesterday, the truck developed a horrendous shake at highway speeds. Pulled off the freeway twice. I checked the front by leaning out at fwy speed, my wife did passenger side. As it grew worse, I was certain it was the left rear. At the second stop I jogged alongside the truck and yes, the left rear tire had an S-curve bulge from the belts separating. These are Cooper A/T tires that came on the Alcoa rims I bought. The tread depth was good, no cracking, but the mfg date was 2001. Through some heavy offroading in and voila, tire failure:

TireFail.jpg
 
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glad the tools worked!

PM me when you are ready to sell the 9 blade fan. If you want to keep it for a bit to make sure the duramax is gonna work, feel free, Im not in a big hurry.
 
Drove it around this afternoon. It runs much quieter and about 1/2 to 1 full tick cooler on the ECT gauge. I can hear more of the turbo whistle. Only negative is a slight rub on the fan shroud during some hard turning accelerations. So I need to do a little more grinding.
 
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BTW saw that tool Chief was talking about. it's called a fan clutch spanner wrench. Lisle makes one for about 40$ but Snap On listed a special one for the 48mm nut clutch and it was 115$. Not sure if the Lisle one is the same. Wouldn't mind picking one up. Might have worked on that one in the picks.
 
Acesneights1 said:
BTW saw that tool Chief was talking about. it's called a fan clutch spanner wrench. Lisle makes one for about 40$ but Snap On listed a special one for the 48mm nut clutch and it was 115$. Not sure if the Lisle one is the same. Wouldn't mind picking one up. Might have worked on that one in the picks.
Click to expand...

The Napa Spanner Tool was $25.98. I bought the wrench (because I did not have one) which allows a 1/2" torque wrench to extend it, but it was completely unnecessary. Removal was pretty simple once I got the spanner tool to fit.

There was a step over the lower radiator hose that needed removal. That's gone and it's very quiet. I guess the plastic fans are quieter than steel. Maybe they just don't reflect the engine sound back like steel? I just have a much quieter engine compartment now.
 
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