Geno's Fan Clutch Tools for '98-'12 Cummins.

[Oil Stain]

I just replaced my fan clutch on my 2012 3500 Ram Turbo diesel. There seems to confusion on how to take off the fan cutch as to which way to unscrew the unit and lack of instructions on how to use the Geno's fan clutch tool set.

First off on my 2012 the fan clutch loosens like any other nut or bolt. Lefty Lucy, righty tidy. I've noticed on most YouTube vids that most people have replaced their air intake with and aftermarket unit which seems to give you a little more room to work with.

I still have the factory air box and removing it gave more room and leverage to work with.

Back to the thread title. Geno's part number WRENCHSET1 has this 3rd tool in the middle (see photo).

No instructions are included. After a few minutes trying to figure out how it works, I'd like to share my findings.

Below is the fan clutch removed for easy viewing.

Using the tool slots at 10 and 2 o'clock this is how the tool should fit against the pulley behind the fan clutch which has been removed for easier viewing.

Below another view.

Below with fan clutch in place.

Below using both wrenches in place.

Now you push down on both wrenches to loosen fan clutch. I had to add a 4' piece of pipe on the left side wrench for added leverage when pushing down and "BAM" she broke loose.

This write up was only meant to show how to use the Geno's fan clutch tool set for the '98-'12 Cummins.

There are lots of videos on YouTube showing how to remove the fan clutch.

I hope this helps.

 

[DavidC]

Nice info, thanks for the post

 

[nukegm]

thanks for the info - while i dont have that year truck, i always perk up when i see fan clutch. my 16 6.4 2500 went through 2 of them in 20,000 miles before i traded for an 18 2500 g56. ram seems to have issues with fan clutches. as a rental 2500 i used for a few days also had a bad clutch....hopefully they have found a different supplier. cheers comrades!

 

[Timd32]

I have posted this before on similar threads.

I forgot to check my small bolts on the pulley after using that tool. It took about 20miles before most of the bolts fell out and threw the belt. So check the small bolts after you use them to hold the pulley.

After reworking it I marked all my pulley bolts and also the fan clutch (not shown).

 

[Cummins12V98]

From what I remember removing the fan in my 98 and 01 those pictured above are LH threads.

 

[Oil Stain]

Good tip I will check them as well.

 

[petersonj]

I bought this fan clutch tool kit from Geno's, also. I was a bit disappointed as I think the tools could have been designed much better with little expense for them to operate in a confined working area. I can easily imagine that by design these tools could be knuckle busters.

#ad

So, I made some changes. Previous to purchasing these tools, I had already owned one wrench just for the nut. I welded that wrench onto the smallest of the new wrenches. Combined, it now makes for a useful wrench (note that a 1/2" drive ratchet handle or breaker bar can be attached to the end for additional leverage.

For the other two wrenches I welded on a 3/4" (19mm) bolt on the end of each handle so that wrenches can be attached to provide additional leverage.

This give you lots of flexibility to position the wrenches to gain the best leverage.

Tip: No matter which year model truck you are working on, use the following procedure to loosen the fan clutch nut:

* Place the wrench on the nut. That wrench will always be turned in the same direction as the fan normally turns (note the directional fan blades) when loosening the nut for the fan clutch.

That is all you have to remember.

- John

 

[Cummins12V98]

Simply take a chisel whack right side of nut and spin it off.

 

[sag2]

At the college we have a Matco set that used an air chisel with the tools. Pops them right off.

 

[Wayne M.]

I just want to remind you guys that you’re working on an awesome accessory drive setup. Some know of my daily job, and that I often work on 6.0, 6.4 and 6.7 Fords. The 6.0, 6.4’s are modified with hydraulic pump PTO’s to add to the madness, and yesterday I had to do a pump on a 6.4. Even stock, these trucks can’t be fixed roadside.
Seeing the photos in this thread actually made me giggle about how simple the Cummins/ Ram engineers made this for us. Enjoy it.
Incidentally I have used that tool on my ‘04 to do my clutch, and it is great. Don’t feel bad about the thread direction on the fan hub. It’s always a hair puller.

 

[Ozymandias]

Nuts with a notch at the edges are left hand thread, without is standard thread

#ad


So have the fans.
(Pictures a jeep liberty Diesel fanclutch)

#ad


No guessing needed.

 

[Oil Stain]

Nuts with a notch at the edges are left hand thread, without is standard thread

#ad


So have the fans.
(Pictures a jeep liberty Diesel fanclutch)

#ad


No guessing needed.

I didn't know that! Never ran into left hand threads much to even notice. Good to know, thanks!

 

[DavidC]

Nuts with a notch at the edges are left hand thread, without is standard thread

#ad


So have the fans.
(Pictures a jeep liberty Diesel fanclutch)

#ad


No guessing needed.

That's good info

 

[Cummins12V98]

GREAT INFO!!!!!!!!!

 

[petersonj]

Nuts with a notch at the edges are left hand thread, without is standard thread

Now that's a good piece of information!! Thank you!

- John

 

[Tuesdak]

The fan loads the engine. So they design it so the resistance of the fan locked up is always tightening the bolt. Less damage if the fan "overruns" and un-threads itself when the engine shuts off. (And simply falls off the threads vs. coming off at full RPM.) So turn the fan clutch nut the same direction it spins with the engine running to loosen it. Aka Overrun.

 

[amauri]

Can anyone please tell me what size open end wrench is needed for the LH thread fan clutch nut on a 2018 6.7?
Biggest wrench I have is 1-1/4"
Thanks

 

[BDaugherty]

Lisle makes a kit to use with and air hammer that’s the best method I’ve ever used on fan clutches.
https://www.amazon.com/Lisle-43300-...590&s=gateway&sprefix=Lisle+fa,aps,156&sr=8-3

 

[ScottLewis]

Can anyone please tell me what size open end wrench is needed for the LH thread fan clutch nut on a 2018 6.7?
Biggest wrench I have is 1-1/4"
Thanks

36 mm (or 1 7/16"), at least on the '06

 

[Randomrunner12]

and this is why i read random posts and follow up on this thread. Truck has 195k miles and still on the factory fan clutch and setup but this will help me out very much when its time to replace it.