Engine fan hub bearing!

flash7210 · **Posted:** Fri Jun 28, 2019 12:27 pm

Bottom line, we’re SOL.
Part is discontinued and not available from Mopar.
Bearing has no identifiable part number on it.
Brought the bearing to a local (and only) bearing shop. Miller Bearings, Jacksonville FL.
They wouldn’t even give me the time of day without a Timken part number. (bunch of pricks!

)

Here are the dimensions:
OD 1.575”
Length 1.535”
Shaft length 2.47
Shaft diameter 0.793

The center shaft is part of the bearing. If you try to press it out you will destroy the bearing.

flash7210 · **Posted:** Fri Jun 28, 2019 12:30 pm

I’m hoping someone can source new bearings or come up with a solution for those that want to continue using the engine driven fan.

WWDiesel · **Posted:** Fri Jun 28, 2019 3:11 pm

flash7210 wrote:

I’m hoping someone can source new bearings or come up with a solution for those that want to continue using the engine driven fan.

I need to get my hands on one of the bearings so I can take it and let some expert bearing people help find a replacement or solution.
There is a company about 50 miles from me called B&D Industrial (Bearings and Drives), they are extremely helpful in finding an unusual bearing fitment.
I had to have a shaft turned down that was worn on a piece of equipment for a customer and they were able to come up with a bearing to fit it perfectly.
Your closest branch is in Ocala. Surprised Jax does not have a branch!

Based on the numbers you posted, using some of the online bearing locators by dimensions, there are several possible candidates.
May have to do a little machine work to make some fit?
May have to stack three sealed bearing together to get the correct long length? :juggle:

That would make it much stronger.
But I surely believe there is a viable solution, just got to figure one out.

GordnadoCRD · **Posted:** Fri Jun 28, 2019 5:13 pm

I saw a post where someone had a re-work fix for this, but it involved a front and rear bearing, and welding the bearings in place to the rear of the bearing mount.

EDIT Found it http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=87604&p=920391&hilit=#p920391

layback40 · **Posted:** Fri Jun 28, 2019 9:18 pm

Has anyone had a look at shaft bearings in the bearing catalogs ? Over many tears I have replaced a few bearing centers in water pumps with new bearings of this type. They have shaft sticking out both ends so you would need to cut one end off. When one of mine fail I will be doing this. Probably a UBC or punk shaft bearing could be made to fit with a little turning. Hope this link works.

https://www.google.com/search?client=fi ... QjAsObQAq0

http://www.kelloggautomotive.com/pdf/punk.pdf

mike71800b · **Joined:** Wed Jul 25, 2012 11:14 pm **Posts:** 23

Welded bearing yeeeouch !

Shaft diameter 0.793 is probably 20mm bearing id
OD 1.575” is 40mm

The end of the rollers look to be "NU" style rollers...
6904-2RS ID=20mm OD=37mm W=9mm

Just a little homework and this problem is easily solved... I can machine the stub and sleeve no problem... the bearings probably just press fit into the sleeve and the stub press fit through the bearing id.

The 6203 bearing mentioned in the other thread is 40mm OD with 17mm ID...

P.S. this would be more simple to clean that shaft end with wire brush, heat sleeve and press apart...

mike71800b · **Joined:** Wed Jul 25, 2012 11:14 pm **Posts:** 23

Have a look at NA4904-2RSR

GordnadoCRD · **Posted:** Sat Jun 29, 2019 4:06 am

AS far as we know it's still working. Pretty sure Gypsy would have posted something had it failed.

For that bearing, You would have to find a way to install an accessible service port for periodic greasing.

I guess it's either that or welding with lifetime sealed bearings.

Probably would be better to weld a stop plate ring on the back, then press the bearings back against it, than to weld on the bearing it's self.
Like a washer, Say, 2 1/4" OD, with a center hole 5/8" ish to be sure they're fully seated when pressed in?

WWDiesel · **Posted:** Wed Jul 03, 2019 3:38 pm

Anyone got a used fan bracket they are not using or willing to get rid of? Mopar PN: 5142661AB
It does not have to be a good one as long as the bearing and housing are still in one piece and serviceable.
PM me.

Want to try and develop a replacement/rebuild option for this part since it does not appear to be available in the US anymore. :banghead:

I made a bunch of calls today to different suppliers all over trying to locate a new one to no avail. Guess they have all dried up! :furious:

I was going to go ahead and buy one and put it in stock for future availability.

Mountainman · **Posted:** Thu Jul 11, 2019 1:18 am

WWDiesel wrote:

Anyone got a used fan bracket they are not using or willing to get rid of? Mopar PN: 5142661AB
It does not have to be a good one as long as the bearing and housing are still in one piece and serviceable.
PM me.

Want to try and develop a replacement/rebuild option for this part since it does not appear to be available in the US anymore. :banghead:

I made a bunch of calls today to different suppliers all over trying to locate a new one to no avail. Guess they have all dried up! :furious:

I was going to go ahead and buy one and put it in stock for future availability.

PM sent, I've got some

spoon · **Posted:** Sat Jul 27, 2019 11:46 am

Any updates on this?

WWDiesel · **Posted:** Wed Sep 04, 2019 12:58 am

spoon wrote:

Any updates on this?

Yes finally Today!
With the help of some good helpful people at Bearings & Drives (B&D Industrial) I have found some bearings that I believe will work to rebuild the fan hubs.
There is NO bearing in existence in this country that they could find of the exact same size and type that is used on this fan hub.
And they have thousands of bearing books and bearings is all that they do!
The OEM bearing is very specialized specific oddball bearing indeed.
40mm OD, 20mm shift OD, and the shaft is the actual inside bearing races for a double row set of ball bearings with grease seals on both ends.

The bearings we found that we think will work will require some very slight machining out of the hub bracket as the bearings are exactly 1mm OD larger than the OEM bearing.
Actually the hole will only require a 0.498mm (0.019606299 in.) larger radius opening to allow for a slight press in fit.
The ID of the new bearing is very close to the correct size of the OEM fan hub shaft.
But the OEM hub shaft will have to be machined to fit the new bearings ID since one end of the hub shaft is also the inside races for the OEM bearing.
Or have some bearing shaft stock of the correct size ordered and cut and machined to ft both the new bearings and the OEM fan hub, all having to be a press fit.

Sorry, it gets little complicated.
But the good news it is looking like I will be able to rebuild the fan hub with these new bearings and will be a better and more robust design than the OEM bearing as it will have three (3) complete sealed roller ball bearings all stacked against each other on the shaft supporting the fan pulley hub.
It will just take some more time to get it all figured out and put together. :ALONE:

I also got to find a machinist with a lathe who will work with me on this project.

Thanks to some LOST members I currently have three failed hubs with housings to work with..... :BANANA:

Comments and suggestions are most welcome....
:POPCORN:

WWDiesel · **Posted:** Wed Sep 04, 2019 11:24 pm

Some notes on today's progress:
Cut one of the OEM bearing in half, discovered the front bearing is actually a roller bearing and the rear bearing is a ball bearing. See 4 pictures below.
Using the OEM shaft, I was able to press the new three bearings onto the OEM shaft. Perfect fit!
Added (drilled & tapped) an additional set screw like the OEM one in the housing to help hold the new bearings in place in the housing.
All that's left is to get the housing machined out to press fit the slightly larger new bearings. Less than 0.5mm larger OD difference.
Getting close, what do you think?

Side by side of new bearings vs OEM bearing.

Picture of OEM bearing cut in half showing internals.

Picture of new bearing stack on top of OEM fan hub.

New bearings vs OEM bearing looking down from pulley end.

mrhemi · **Joined:** Tue Dec 08, 2015 10:46 am **Posts:** 180

Not your average do it yourself project (due to the machining required) but well done. This should add life to our little oil burners.

TKB4 · **Posted:** Thu Sep 05, 2019 2:34 pm

LooKs GREEAT! :BANANA:

Thanks for the effort!

GordnadoCRD · **Posted:** Thu Sep 05, 2019 6:59 pm

Have we compiled a full list of part #s of what is needed to buy, and what components need what mods?

That would be a great future reference post.

ebbnflow · **Posted:** Thu Sep 05, 2019 9:10 pm

Thanks for tackling this and sharing! Great job!

Sent from my Pixel 3 using Tapatalk

layback40 · **Posted:** Fri Sep 06, 2019 7:07 am

Great work!
One small question ~ What stops the shaft from moving in the bearings? Is there a lip at the end?

WWDiesel · **Posted:** Fri Sep 06, 2019 1:55 pm

layback40 wrote:

Great work!
One small question ~ What stops the shaft from moving in the bearings? Is there a lip at the end?

The shaft is pressed into the bearings, it is a press fit! But I do plan to add a lock collar on the front side as a safety and spot weld a ring on the back end of the shaft so the shaft cannot move in either direction. Just to be super safe. I am a firm believer in over building.
I have ordered an adjustable reamer to ream out the housing to allow the slightly larger bearings to fit.
I will post some pictures once I get all the parts and components together and get one fully assembled....

On a side note, I have looked high and low and researched looking for the exact bearing that is used in the OEM housing to no avail in this part of world.
Found some close matches overseas but nothing having a perfect match.
It is called a waterpump bearing and it has one set of roller bearings on the front end and a set of ball bearings on the rear or back end of the shaft. The shaft itself is the races for both bearings. The only way to get the bearing apart is to cut the outer shell off. :banghead:

The shaft is 20.00mm and the outside of the OEM bearing is 40.00mm
If anyone knows or can find one of these oddball bearings, I am ALL EARS!

layback40 · **Posted:** Fri Sep 06, 2019 7:39 pm

WWDiesel wrote:

The shaft is pressed into the bearings, it is a press fit! But I do plan to add a lock collar on the front side as a safety and spot weld a ring on the back end of the shaft so the shaft cannot move in either direction. Just to be super safe. I am a firm believer in over building.
I have ordered an adjustable reamer to ream out the housing to allow the slightly larger bearings to fit.
I will post some pictures once I get all the parts and components together and get one fully assembled....

On a side note, I have looked high and low and researched looking for the exact bearing that is used in the OEM housing to no avail in this part of world.
Found some close matches overseas but nothing having a perfect match.
It is called a waterpump bearing and it has one set of roller bearings on the front end and a set of ball bearings on the rear or back end of the shaft. The shaft itself is the races for both bearings. The only way to get the bearing apart is to cut the outer shell off. :banghead:

The shaft is 20.00mm and the outside of the OEM bearing is 40.00mm
If anyone knows or can find one of these oddball bearings, I am ALL EARS!

I have fitted these sorts of bearings in agricultural (tractor) applications in years gone by. VM have a presence in those markets with some EU tractors having VM engines.
Probably a few spots of weld on the back end of the shaft prior to assembly is what is required. A spacer (washers?) between the bearing & the pulley on the front & would be good to go.
Has anyone contacted VM engine specialists in the UK to see if they can supply the bearing?
Good luck with the project!

Engine fan hub bearing!

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