Wrench Size for Removing Fan - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 01-22-2006, 10:34 PM   #1 (permalink)
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Wrench Size for Removing Fan

Does anyone know the wrench size for removing the fan to get to the water pump pullley? I know it's over 1", is it reverse thread? Thanks
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Old 01-22-2006, 10:41 PM   #2 (permalink)
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Re: Wrench Size for Removing Fan

It's a 17/8 wrench and it's the normal right hand thread.
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Old 01-22-2006, 10:53 PM   #3 (permalink)
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Re: Wrench Size for Removing Fan

Thanks FordMastertech! Also, is the best way to get the belt tensioner to move by using a box end wrench?
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Old 01-23-2006, 02:18 AM   #4 (permalink)
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Re: Wrench Size for Removing Fan

1/2" drive wrench with a little cheater, if necessary.
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Old 01-23-2006, 05:46 AM   #5 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
It's a 17/8 wrench and it's the normal right hand thread.
FMT

[/ QUOTE ]

17/8 what is this? If I remember right this is an improper fraction, the proper size would be 2 1/8", unless I missed something [img]/ubbthreads/images/graemlins/biggrin.gif[/img] [img]/ubbthreads/images/graemlins/shrug.gif[/img]
BTW you can buy a cheap stamped wrench at any auto parts store for about 10-15 bucks. Now install a coolant filter to save your new pump!!!
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Old 01-23-2006, 08:28 AM   #6 (permalink)
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Re: Wrench Size for Removing Fan

I think you wont be able to get the fan off with a wrench alone. I used a air chipping gun to get the OLD ONE OFF,, DO NOT use it to reinstall on the new fan. Take the chipping gun blade and put it against the proper edge to unscrew,,and burp it a couple times. Nut will come off very easy then. To reinstall just get it as tight as you can while holding the fan,,, engine running will do the rest over time.

AND I THINK he meant 1 AND 7/8" wrench NC.... just missed the space.
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Old 01-23-2006, 08:37 AM   #7 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
I think you wont be able to get the fan off with a wrench alone. I used a air chipping gun to get the OLD ONE OFF,, DO NOT use it to reinstall on the new fan. Take the chipping gun blade and put it against the proper edge to unscrew,,and burp it a couple times. Nut will come off very easy then. To reinstall just get it as tight as you can while holding the fan,,, engine running will do the rest over time.

AND I THINK he meant 1 AND 7/8" wrench NC.... just missed the space.

[/ QUOTE ]


you mean an "air hammer" with a chiesel tip [img]/ubbthreads/images/graemlins/smile.gif[/img]
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Old 01-27-2006, 10:12 PM   #8 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
Does anyone know the wrench size for removing the fan to get to the water pump pullley? I know it's over 1", is it reverse thread? Thanks

[/ QUOTE ]

Try using a pipe wrench on the lip of the pully and 1 7/8 wrench or big cresent.And yes he forgot a little space.
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Old 01-28-2006, 01:56 AM   #9 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
Try using a pipe wrench on the lip of the pully and 1 7/8 wrench or big cresent.And yes he forgot a little space.

[/ QUOTE ]

A pipe wrench will surely bugger the pulley up, and you'll need a 24" or larger pipe wrench to open that far.

The best thing to hold the pulley is the proper wrench that engages two of the bolts on the pulley, kind of a hinged "Y" shaped arrangement with hooks on the ends. I got mine at NAPA for about $25. Pretty cheap investment, and saves lots of screwing around and potential damage.

The nut on the fan clutch is actually 48mm, but 1-7/8 inch is close enough.
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Old 01-28-2006, 06:37 AM   #10 (permalink)
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Re: Wrench Size for Removing Fan

The tool you need to hold the fan still can be barrowed from Auto Zone or any other local such store. As for the big bolt, I used a crescent wrench. No problem. I got all confused with this reverse thread vs. Standard thread, and which way we are facing.... if you are looking at the truck from the front you will need to turn the wrench counter-clockwise. Good luck and may the force be with you...
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Old 01-28-2006, 08:52 AM   #11 (permalink)
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Re: Wrench Size for Removing Fan

I replaced my WP not long ago. I used a pipe wrench on the nut. O'rielly's here had a "fan clutch wrench". Thier policy is to buy the tool ($75), and of brought back within 48 hours they give you your money back, essentially a free loaner.

The fan clutch wrench DID NOT list the 7.3 PS as one of the engines it fit, it did however work great.
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Old 01-28-2006, 10:06 PM   #12 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
A pipe wrench will surely bugger the pulley up, and you'll need a 24" or larger pipe wrench to open that far.

The best thing to hold the pulley is the proper wrench that engages two of the bolts on the pulley, kind of a hinged "Y" shaped arrangement with hooks on the ends. I got mine at NAPA for about $25. Pretty cheap investment, and saves lots of screwing around and potential damage.

The nut on the fan clutch is actually 48mm, but 1-7/8 inch is close enough.

[/ QUOTE ]


I used a small pipe wrench about the size of my hand. putting it under the lip and used it like a vice, if you use a rag no markes.
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Old 01-29-2006, 02:45 AM   #13 (permalink)
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Re: Wrench Size for Removing Fan

[ QUOTE ]
I used a small pipe wrench about the size of my hand. putting it under the lip and used it like a vice, if you use a rag no markes.

[/ QUOTE ]

I understand now. Kind of like hooking the wrench over the lip of a tin can. You still might run the risk of bending the pulley rim if the fan clutch nut on there real tight.

I still prefer the pulley holding tool I got, but might try the pipe wrench in a pinch and nothing else was available.
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