12v Fan Support/Hub - Competition Diesel.Com

Tobin · 01-03-2018, 01:49 PM

Anyone run a fan support/hub that moves the stock mechanical fan up a couple inches in their swaps? From my searching on the interwebs, looks like the Dodge one is the only one that has 6 bolts and has a threaded fan hub. I really would like to be able to move my fan up a couple inches if possible.

Cozze44 · 01-03-2018, 02:44 PM

I've seen people use these adapters before, they work very well, and open a wide array of fan options, such as blade count, material, and size.
Flex-a-lite 852: 1/2 Steel Spacer/Clutch Fan Adapter Female Thread Pitch: 30mm x 1.5 Left Hand Thread | JEGS

Edit: I'm not sure of the OEM thread size, just using as an example.

Nor'Easter · 01-03-2018, 05:38 PM

Not sure what you mean by "up", I'd call it forward or backward.

If backward, ditch the clutch and use an adapter and aluminum fan. Have done two swaps this way. Fan blades 1/2" from the balancer.

Tobin · 01-03-2018, 06:16 PM

Quote:

Originally Posted by Nor'Easter

Not sure what you mean by "up", I'd call it forward or backward.

If backward, ditch the clutch and use an adapter and aluminum fan. Have done two swaps this way. Fan blades 1/2" from the balancer.

Up as in straight up from where it is now, closer to the top of the engine.

Mark Nixon · 01-03-2018, 06:27 PM

Some bigger trucks and stationary equipment move them up.
The thing about many of the fan hubs, is that they use the same standard bearing, so you can swap the center 6 bolt "spindle" from a Dodge app into a non-dodge app.

Mark.

95cummins5.9 · 01-03-2018, 06:34 PM

Look up like a 3909888 from a 4b

9724VF350 · 01-03-2018, 08:50 PM

There is 11.5, 13.5, 15.5, and 17.5" from the center of the crank to the center of the fan available, along with some others that I don't know off the top of my head.

Tobin · 01-04-2018, 06:28 AM

Thanks, this is good information. Do they all keep the fan at the same offset (pulleys in line) as the stock Dodge if I swap bearings around? This would be a great option.

BigPapa · 01-04-2018, 06:34 AM

The 1st Gen Fan Support mounts the fan higher. I'm not sure on current Cummins availabilty. You'll need to find a used one or check with Jeff at Mumau (Snedge).

9724VF350 · 01-04-2018, 07:01 AM

All the ones I mentioned are inline, 0.0 horizontal offset. As Mark stated several use the same bearing, so the center hub can be swapped, but a few use a water pump style bearing.

The 1992 pictured above is 9.5" and the 1995 is a 8" with about a 2" horizontal offset.

Tobin · 01-04-2018, 07:37 AM

Ok, so if I use the 11.5" center of crank to center of fan support one (would work best), I would need to space the fan out about 2" horizontally or will swapping the Doge bearing in the Cummins support take care of that?

I know where I can rob a 1st gen mount, that will work better than the 2nd gen. I'll test fit that one first.

9724VF350 · 01-04-2018, 07:53 AM

Quote:

Originally Posted by Tobin

Ok, so if I use the 11.5" center of crank to center of fan support one (would work best), I would need to space the fan out about 2" horizontally or will swapping the Doge bearing in the Cummins support take care of that?

I know where I can rob a 1st gen mount, that will work better than the 2nd gen. I'll test fit that one first.

There is a standard 11.5, and a HD 11.5. The HD uses the same bearing as the Dodge so the hub can be swapped and belt alignment will be good. The horizontal offset I mentioned shifts the fan the drivers side, not forward.

The 11.5 bolts to the 4 bolts on the front of the head, rather than the front of the block like most.

Signature600 · 01-04-2018, 07:54 AM

There are 2 places they will mount on the truck mounts, one on the block, one on the head...pattern is the same...What I don't remember is which one is factory on a Dodge.

Chris

Tobin · 01-04-2018, 08:30 AM

Unfortunately the pattern on the head and the block isn't the same. The head is a square and the block is a triangle shape mount. Would work perfect through it they were the same.

I would rather mount on the block, but the head is okay if I have to mount it there. Gets close to the coolant hose.

Tobin · 01-04-2018, 08:31 AM

Quote:

Originally Posted by 9724VF350

There is a standard 11.5, and a HD 11.5. The HD uses the same bearing as the Dodge so the hub can be swapped and belt alignment will be good. The horizontal offset I mentioned shifts the fan the drivers side, not forward.

The 11.5 bolts to the 4 bolts on the front of the head, rather than the front of the block like most.

Do you have a part number for the 11.5 HD?

9724VF350 · 01-04-2018, 08:55 AM

3913433. There's several on eBay right now for a good deal.

BigPapa · 01-04-2018, 09:34 AM

Quote:

Originally Posted by Tobin

Unfortunately the pattern on the head and the block isn't the same. The head is a square and the block is a triangle shape mount.

Correct. The Cummins drawing I posted above is incorrect on where the support bolts up on the '92.

Quote:

Originally Posted by 95cummins5.9

Look up like a 3909888 from a 4b

That one bolts to the head with the "square" bolt pattern.

Quote:

Originally Posted by 9724VF350

3913433. There's several on eBay right now for a good deal.

Also bolts to the head.

9724VF350 · 01-04-2018, 11:10 AM

Quote:

Originally Posted by 95cummins5.9

Look up like a 3909888 from a 4b

This is the standard 11.5 and uses a water pump style bearing with a 50mm 4 bolt pattern fan mounting hub.

Tobin · 01-04-2018, 11:18 AM

I just looked at a 89/92 non IC Dodge motor and it had the same support as my 97 P-pump motor.

Those two (3909888 and 3913433) look pretty similar according to my Google picture search. I'll see if the local Cummins dealer has any in stock to at least take a look at in person.

Tobin · 01-04-2018, 11:19 AM

Quote:

Originally Posted by 9724VF350

This is the standard 11.5 and uses a water pump style bearing with a 50mm 4 bolt pattern fan mounting hub.

So I want the 3913433 11.5HD so it takes the Dodge size bearing that I can swap in there with the 6 bolt threaded hub?

01-03-2018, 01:49 PM	#1
Tobin Name: Tobin Title: 5.7 IDI Powaa! Status: Not Here Join Date: Oct 2008 Location: Oviedo, FL Member`s Gallery Posts: 1,506	12v Fan Support/Hub Anyone run a fan support/hub that moves the stock mechanical fan up a couple inches in their swaps? From my searching on the interwebs, looks like the Dodge one is the only one that has 6 bolts and has a threaded fan hub. I really would like to be able to move my fan up a couple inches if possible. __________________ 2006 Dodge 2500 QCLB 4x4 Goerend 48RE 1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs

01-03-2018, 02:44 PM	#2
Cozze44 Name: Cozze44 Title: Junkman Status: Not Here Join Date: Feb 2012 Location: WIND GAP, PA Member`s Gallery Posts: 1,315	I've seen people use these adapters before, they work very well, and open a wide array of fan options, such as blade count, material, and size. Flex-a-lite 852: 1/2 Steel Spacer/Clutch Fan Adapter Female Thread Pitch: 30mm x 1.5 Left Hand Thread \| JEGS Edit: I'm not sure of the OEM thread size, just using as an example. __________________ Frank 03 Subaru Forester - Old man car - 300k - RIP 07 Subaru Forester - Dadmobile - 129k 14 Subaru Legacy Outback - Wifes ride - 70k 02 Dodge 2500 My Build Thread Last edited by Cozze44; 01-03-2018 at 02:46 PM.

01-03-2018, 05:38 PM	#3
Nor'Easter Name: Nor'Easter Title: Too Much Time Status: Not Here Join Date: Nov 2012 Location: Maine Member`s Gallery Posts: 947	Not sure what you mean by "up", I'd call it forward or backward. If backward, ditch the clutch and use an adapter and aluminum fan. Have done two swaps this way. Fan blades 1/2" from the balancer. __________________ Mike Stacked silencer rings. 1957 Cummins Power Wagon 2014 Regular Cab G56

01-03-2018, 06:27 PM	#5
Mark Nixon Name: Mark Nixon Title: No Savior among the flesh Status: Not Here Join Date: Feb 2009 Location: Brownville, Nebraska Member`s Gallery Posts: 8,676	Some bigger trucks and stationary equipment move them up. The thing about many of the fan hubs, is that they use the same standard bearing, so you can swap the center 6 bolt "spindle" from a Dodge app into a non-dodge app. Mark. __________________ If you or I did business like the PEOPLE in government do business, we'd be put in jail. Government is coercive. Anarchy: The state of existence where there are no masters & no slaves. Therefore, Anarchy means the ABSENCE OF SLAVERY, or, in other words, FREEDOM.

01-03-2018, 08:50 PM	#7
9724VF350 Name: 9724VF350 Title: Tractor Guy Status: Not Here Join Date: Mar 2010 Location: Northeast Ohio Member`s Gallery Posts: 2,784	There is 11.5, 13.5, 15.5, and 17.5" from the center of the crank to the center of the fan available, along with some others that I don't know off the top of my head. __________________ 97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand. Playtoy-Oliver 1655. 12V now, 13mm, S475 Wife's ride-03 Excursion 12V swap in the works.

01-03-2018, 06:34 PM	#6
95cummins5.9 Name: 95cummins5.9 Title: Old man *** gossiper Status: Not Here Join Date: Jun 2012 Location: U.S.A Member`s Gallery Posts:** 4,720	Look up like a 3909888 from a 4b

01-04-2018, 06:28 AM	#8
Tobin Name: Tobin Title: 5.7 IDI Powaa! Status: Not Here Join Date: Oct 2008 Location: Oviedo, FL Member`s Gallery Posts: 1,506	Thanks, this is good information. Do they all keep the fan at the same offset (pulleys in line) as the stock Dodge if I swap bearings around? This would be a great option. __________________ 2006 Dodge 2500 QCLB 4x4 Goerend 48RE 1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs

01-04-2018, 07:01 AM	#10
9724VF350 Name: 9724VF350 Title: Tractor Guy Status: Not Here Join Date: Mar 2010 Location: Northeast Ohio Member`s Gallery Posts: 2,784	All the ones I mentioned are inline, 0.0 horizontal offset. As Mark stated several use the same bearing, so the center hub can be swapped, but a few use a water pump style bearing. The 1992 pictured above is 9.5" and the 1995 is a 8" with about a 2" horizontal offset. __________________ 97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand. Playtoy-Oliver 1655. 12V now, 13mm, S475 Wife's ride-03 Excursion 12V swap in the works.

01-04-2018, 07:37 AM	#11
Tobin Name: Tobin Title: 5.7 IDI Powaa! Status: Not Here Join Date: Oct 2008 Location: Oviedo, FL Member`s Gallery Posts: 1,506	Ok, so if I use the 11.5" center of crank to center of fan support one (would work best), I would need to space the fan out about 2" horizontally or will swapping the Doge bearing in the Cummins support take care of that? I know where I can rob a 1st gen mount, that will work better than the 2nd gen. I'll test fit that one first. __________________ 2006 Dodge 2500 QCLB 4x4 Goerend 48RE 1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs

01-04-2018, 07:54 AM	#13
Signature600 Name: Signature600 Title: THA MAN! Status: Not Here Join Date: Aug 2006 Location: Jeffersonville, Ohio Member`s Gallery Posts: 11,975	There are 2 places they will mount on the truck mounts, one on the block, one on the head...pattern is the same...What I don't remember is which one is factory on a Dodge. Chris __________________ THANKS TO: Tim Barber @ TRE Diesel Jeff Mumau @ Mumau Diesel Service Rip @ Source Automotive Don Thuren @ ThurenFab Suspension Columbus Diesel Supply

01-04-2018, 08:30 AM	#14
Tobin Name: Tobin Title: 5.7 IDI Powaa! Status: Not Here Join Date: Oct 2008 Location: Oviedo, FL Member`s Gallery Posts: 1,506	Unfortunately the pattern on the head and the block isn't the same. The head is a square and the block is a triangle shape mount. Would work perfect through it they were the same. I would rather mount on the block, but the head is okay if I have to mount it there. Gets close to the coolant hose. __________________ 2006 Dodge 2500 QCLB 4x4 Goerend 48RE 1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs

01-04-2018, 08:55 AM	#16
9724VF350 Name: 9724VF350 Title: Tractor Guy Status: Not Here Join Date: Mar 2010 Location: Northeast Ohio Member`s Gallery Posts: 2,784	3913433. There's several on eBay right now for a good deal. __________________ 97 F350 4X4 CC Dually 5spd 24V 913 S300/HT3B Ranch Hand. Playtoy-Oliver 1655. 12V now, 13mm, S475 Wife's ride-03 Excursion 12V swap in the works.

01-04-2018, 11:18 AM	#19
Tobin Name: Tobin Title: 5.7 IDI Powaa! Status: Not Here Join Date: Oct 2008 Location: Oviedo, FL Member`s Gallery Posts: 1,506	I just looked at a 89/92 non IC Dodge motor and it had the same support as my 97 P-pump motor. Those two (3909888 and 3913433) look pretty similar according to my Google picture search. I'll see if the local Cummins dealer has any in stock to at least take a look at in person. __________________ 2006 Dodge 2500 QCLB 4x4 Goerend 48RE 1977 F250 RCLB 4x4 "High Boy" 12 valve, 180 pump, 5x.014, S363/S475, Goerend 47RH, NP271, 2007 D60/Sterling 10.5, 40" Toyo MTs