Selectro freewheel hub assembly

[gromit]

I've just stripped, cleaned & checked a pair of Selectro freewheel hubs.

The worst part was cleaning off HMP grease and dirt, the two main parts were then cleaned and painted. Next replacement O-rings were sourced from a local O-ring supplier, now for assembly.

Parts cleaned & painted.
https://www.aulro.com/afvb/images/imported/2017/08/58.jpg (https://flic.kr/p/WaYnak)DSCN4445 (https://flic.kr/p/WaYnak) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

I had to Loctite the bushes in these parts. The bushes were loose allowing movement and the aluminium housing was worn (groove behind the bush). Should be OK now the bush is held in place.
https://www.aulro.com/afvb/images/imported/2017/08/90.jpg (https://flic.kr/p/WPVF3u)DSCN4453 (https://flic.kr/p/WPVF3u) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Grease the inside of the cap, grease the spring and put the small diameter end in first.
https://www.aulro.com/afvb/images/imported/2017/08/91.jpg (https://flic.kr/p/Wa9jbb)DSCN4455 (https://flic.kr/p/Wa9jbb) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Next insert this part.
https://www.aulro.com/afvb/images/imported/2017/08/92.jpg (https://flic.kr/p/XqY77Z)DSCN4456 (https://flic.kr/p/XqY77Z) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

This is the cam that engages or disengages drive.
https://www.aulro.com/afvb/images/imported/2017/08/93.jpg (https://flic.kr/p/WPVBho)DSCN4457 (https://flic.kr/p/WPVBho) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Grease & insert the cam.
https://www.aulro.com/afvb/images/imported/2017/08/94.jpg (https://flic.kr/p/Xb7QPo)DSCN4458 (https://flic.kr/p/Xb7QPo) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Now the tricky bit.....push the parts down into the cap against the spring (after lining up the screw holes in the cam). Three screws have to be inserted into the holes to hold the cam in place, might take a couple of attempts.
https://www.aulro.com/afvb/images/imported/2017/08/95.jpg (https://flic.kr/p/XdWi9v)Selectro 6 (https://flic.kr/p/XdWi9v) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Now assemble these parts.
https://www.aulro.com/afvb/images/imported/2017/08/96.jpg (https://flic.kr/p/Xb8Cns)Selectro 2 (https://flic.kr/p/Xb8Cns) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Press into the hub and fit the circlip.
https://www.aulro.com/afvb/images/imported/2017/08/97.jpg (https://flic.kr/p/WcztxK)Selectro 3 (https://flic.kr/p/WcztxK) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Be careful with the circlip above. When taking it out it can travel some distance if you're not careful !

Put the O-ring into the narrow groove.
https://www.aulro.com/afvb/images/imported/2017/08/98.jpg (https://flic.kr/p/XdUPqr)Selectro 4 (https://flic.kr/p/XdUPqr) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

Make sure the O-ring is lubricated with grease. Push the cap over the main section of the hub and insert the screws shown (3) to hold it in place. The screws locate in the wide groove.
https://www.aulro.com/afvb/images/imported/2017/08/99.jpg (https://flic.kr/p/XdVHSk)Selectro 5 (https://flic.kr/p/XdVHSk) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr

When stripped the hubs were packed full of grease. When I assembled them I just used a paintbrush to apply grease to every surface as I put it together.

O-ring is BS-037 N70 try your local O-ring supplier or I can source them.

To fit back to the front hubs you have to take off the endcap (3 screws). Fit a gasket to the hub, slip the driveshaft through the centre section, install the 5 hub bolts then fit the washer & castle nut to the end of the driveshaft. Install a new splitpin, apply some grease to the nut and then re-fit the outer cap of the freewheel hub (3 screws).

Now decide whether to leave it engaged or disengaged.

Just found some exploded views on the Interweb. Not branded Selectro and the second one is for a different vehicle. Second picture shows some 'special' washers for the hub bolts, I wondered what the raised pips were for each side of the hub bolt holes.....
https://www.aulro.com/afvb/images/imported/2017/08/190.jpg
https://www.aulro.com/afvb/images/imported/2017/08/192.jpg (https://flic.kr/p/WfoQDN)Selectro diagram (https://flic.kr/p/WfoQDN) by Colin Radley (https://www.flickr.com/photos/152321353@N07/), on Flickr


Colin

[Johnno_p]

Great write up. Thanks [emoji106]

[SG1 Bones]

Wow that was a quick turn around with the post. It is very informative, thankyou. Now I just have to plan when I'm going to tackle the job.

Thanks again
Nathan.

[whitehillbilly64]

Great write-up
Where did you since the o rings from. Of the shelf, bearing shop ?
What grease would you recommend ?

Whitehillbilly

[gromit]

Great write-up
Where did you since the o rings from. Of the shelf, bearing shop ?
What grease would you recommend ?

Whitehillbilly

I took the parts into an O-ring shop and they determined the correct size. Also took in the original O-ring but from experience they prefer to measure the parts rather than an old crumbly O-ring.

Just used high melting point bearing grease.

Colin

[whitehillbilly64]

Thanks.
O ring part no, sizing on receipt by any chance.

whitehillbilly

[gromit]

Thanks.
O ring part no, sizing on receipt by any chance.

whitehillbilly

No receipt when you pay cash[bigwhistle]

I think I have the number.


Colin

[whitehillbilly64]

Once The o ring sizes have been added to your above post, the rebuild part of the post,
Maybe made into a, Free Wheeling hubs 'sticky'

whitehillbilly

[Johnno_p]

The worst part was cleaning off HMP grease and dirt, the two main parts were then cleaned and painted.

What did you use to clean it up with?

[gromit]

Scraped out a lot of the grease & dirt then degreased with mineral turps.

Most of the black paint had worn off so wire brushed to remove dirt & corrosion followed by a light sand with fine emery paper. Then degreased with metho and after masking off a quick paint with rattle can black epoxy paint.

Then some emery paper on a flat surface to sand off the paint on the logo/instructions.


Colin

[gromit]

Just added some diagrams to the first post.


Colin

[Johnno_p]

I found this post very helpful in rebuilding mine.

Start of cleaning them up
https://www.aulro.com/afvb/images/imported/2017/10/721.jpg

And now reassembled
https://www.aulro.com/afvb/images/imported/2017/10/722.jpg

Thanks to David at Land Rover Heaven for some spare parts [emoji106]
https://www.aulro.com/afvb/images/imported/2017/10/723.jpg

[Lowe123]

Very informative write up you've got there. Im in a bit more of a predicament. and hoping you gents can help pointing me in the right direction for a spare part.

The story is. I've had my Landy for 6 months, and at the time was told there was a problem with the front right freewheeling hub.This weekend I found some time to open them both up and investigate. It turns out the collar on the base plate is sheared of in the corresponding locations to the locking pins. My guess is that a hard nudge on the hub ie rock/ tree whilst off road did its number.

What it looks like...
140751

What it should look like...
140752

Thankfully the hub stays on whilst in the fully engaged / disengaged position, so everyday driving is no problem, however its something I need to fix soon. Any ideas where i could go looking for parts... ideally located in Australia.

Thoughts and help welcome, and thanked in advance.

[gromit]

Very informative write up you've got there. Im in a bit more of a predicament. and hoping you gents can help pointing me in the right direction for a spare part.

The story is. I've had my Landy for 6 months, and at the time was told there was a problem with the front right freewheeling hub.This weekend I found some time to open them both up and investigate. It turns out the collar on the base plate is sheared of in the corresponding locations to the locking pins. My guess is that a hard nudge on the hub ie rock/ tree whilst off road did its number.

What it looks like...
140751

What it should look like...
140752

Thankfully the hub stays on whilst in the fully engaged / disengaged position, so everyday driving is no problem, however its something I need to fix soon. Any ideas where i could go looking for parts... ideally located in Australia.

Thoughts and help welcome, and thanked in advance.

Not sure if you'll find spare parts so you'll have to look for another Selectro hub.
Maybe someone has one that's damaged but the part you need is OK. Worth advertising under Wanted in the Markets section of the forum.

Colin

[87County]

Excellent writeup and rebuild - thanks Colin.

FWHs weren't the best idea on Series vehicles and I suppose most owners ended up removing them (I did - still have them "in stock").

They seem to have found a new lease of life from owners of 6X6 Perenties who fit them to the rearmost axle in the hope of reducing tyre scrubbing

[JDNSW]

Excellent writeup and rebuild - thanks Colin.

FWHs weren't the best idea on Series vehicles and I suppose most owners ended up removing them (I did - still have them "in stock").

They seem to have found a new lease of life from owners of 6X6 Perenties who fit them to the rearmost axle in the hope of reducing tyre scrubbing

The advantages of free wheel hubs on Series Landrovers are minimal, and the disadvantages very real. They were mostly fitted by dealers eager to sell "optional extras", and contrary to your supposition few owners actually removed them, I suppose because they were not about to admit (even to themselves) they had wasted money.

I have difficulty seeing how the free wheel hubs on the rear axle of a 6x6 could have any effect on tyre scrubbing - the reason the tyres scrub is that they are being dragged sideways on corners, not because they are turning the diff and prop shaft. But I suppose the same factors are at play!

[87County]

...

I have difficulty seeing how the free wheel hubs on the rear axle of a 6x6 could have any effect on tyre scrubbing - the reason the tyres scrub is that they are being dragged sideways on corners, not because they are turning the diff and prop shaft. But I suppose the same factors are at play!

... got it in one JD :)

maybe I should have termed it "unnecessary tyre wear & driveline stress"

[B.S.F.]

Quite often replacing the O-ring doesn't do a thing because there is a groove worn in the part you rotate, where the O-ring sits against. Selectro and Dualmatic parts are inter changeable.
.W.

[gromit]

I've removed FW hubs from most of mine, I reconditioned the Selectros in this thread but haven't re-fitted them.
The biggest downfall of using them is the lack of lubrication to the Railco bush unless you regularly engage them (that reminds me I must engage those on my SIII shorty next time I use it.....)
They might be handy if you snapped a front driveshaft, just drop the propshaft and disengage the FW hubs to drive home.
I was considering getting a couple of worn drive members and machining out the splines, these could then be fitted to front or rear axle as a 'get home' bodge should a driveshaft break.



Colin

[JDNSW]

A little considered potential issue with free wheel hubs - you are driving with the hubs unlocked, climbing a hill and you break a half axle (not an unknown occurrence!). You stop it from rolling back by applying the brake. If you are alone, now what do you do? As soon as you take your foot off the brake, it rolls back. The handbrake does not work. Unless you have a passenger who can hop out and engage the hubs, or you can allow it to run back slowly into something that will stop it, you are in a serious pickle!

I should point out that to lubricate the top swivel bearing, you do not need to engage the hubs. Engaging four wheel drive (while stopped) will have the same effect (unless one side is a lot easier to turn than the other, a rather unlikely situation. This saves getting out and getting your hands dirty.

[123rover50]

The advantages of free wheel hubs on Series Landrovers are minimal, and the disadvantages very real. They were mostly fitted by dealers eager to sell "optional extras", and contrary to your supposition few owners actually removed them, I suppose because they were not about to admit (even to themselves) they had wasted money.

I have difficulty seeing how the free wheel hubs on the rear axle of a 6x6 could have any effect on tyre scrubbing - the reason the tyres scrub is that they are being dragged sideways on corners, not because they are turning the diff and prop shaft. But I suppose the same factors are at play!

I fitted the FWH to the rear axle of my 6x6 not to stop scrubbing but to stop wear on the driveshaft, double cardon joint thing and rear diff. They are all like new still

[JohnboyLandy]

Does anyone know where I can source a replacement for one of the three screws ? They look a but special with the last few millimetres unthreaded and smaller diameter.

Thanks
John

[Johnno_p]

Does anyone know where I can source a replacement for one of the three screws ? They look a but special with the last few millimetres unthreaded and smaller diameter.

Thanks
John

I think they had thread right to the end or at least mine did. You can see them
In the below picture.
Probably the ends of yours are worn
https://www.aulro.com/afvb/images/imported/2018/05/497.jpg

[vinnoh]

I took the parts into an O-ring shop and they determined the correct size. Also took in the original O-ring but from experience they prefer to measure the parts rather than an old crumbly O-ring.

Just used high melting point bearing grease.

Colin


BS-307 'O' Rings required
BS037 Nitrile O Ring 2.625" x 0.07"

[gromit]

BS-307 'O' Rings required
BS037 Nitrile O Ring 2.625" x 0.07"


Part number is in the first post.

Colin