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Removal of splined rear wheel hub. #601142
26/10/19 02:51 PM
26/10/19 02:51 PM
Joined: Aug 2017
Posts: 86
Staffordshire UK
Calypso Red Offline OP
Just Getting Started
Calypso Red  Offline OP
Just Getting Started

Joined: Aug 2017
Posts: 86
Staffordshire UK
Hi Chaps/Chapesses, 2002 4/4 with leaking rear wheel cylinders, time for a change. I did this same job a couple of years ago on the +8. Fiddled the old wheel cylinders out and the replacements in with no problems so this time I thought it would be a breeze laugh2. Unfortunatly, after alot of unsucessful fiddling, I compared the replacement cylinders with the MMC originals. The originals are built like Russian tanks with insufficient clearance from the hub flange to allow for removal. The hubs will have to come off mad. Any advice I have come across (GoMog etc) just says 'remove hubs' and 'replace hubs'. I can see a split pin that has to come out and a big castellated nut (what size?) that has to be undone. Does it need to be in gear to stop the half shaft rotating? I have hear whispers of impact hammers and HUGE hydraulic pullers, (where do I attach them?). Assuming I reach the point of re-assembly, do I tighten the big nut up till the hub seizes and then back it off one castellation and replace the pin or what? Any appropriate advice would be welcome sos.


Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601148
26/10/19 03:21 PM
26/10/19 03:21 PM
Joined: Aug 2015
Posts: 845
A
Arwyn Williams Offline
Talk Morgan Regular
Arwyn Williams  Offline
Talk Morgan Regular
A

Joined: Aug 2015
Posts: 845
Are you sure they are the right wheel cylinders? Hubs should not have to come off to change the wheel cylinders.

Getting the hub off is a right pain the arse, but you will need to remove the pin and slacken but not remove the nut nut, nut is 1.250AF, you will then need a large puller, either a three leg type or one which screws on where the wheel spinner would go. Grease the puller thread and tighten. One of two things will then happen - either the hub will free off or it will refuse to budge.

If the latter, tighten up the puller as much you can and leave overnight, chances are it will come free overnight.

If it still doesn't come loose, a couple of clouts with a lead mallet will get it free.

The idea behind leaving the halfshaft nut partly undone, is to stop the hub flying across the workshop when it comes undone!

Mulfab sold a tool for locking the hub whilst you slacken/tighten the hub.

When refitting the hub, make sure the woodruff type keys are correctly set in their key ways otherwise they will ride up the taper and split the hub for certain.

I've always torqued my hubs to a specific ffigure and then made sure the pin lines up by carefully filing the back the nut. The figure I use is for 7Ha axles so may not apply to BTR axles

Arwyn




Last edited by Arwyn Williams; 26/10/19 03:26 PM.
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601168
26/10/19 05:24 PM
26/10/19 05:24 PM
Joined: Aug 2017
Posts: 86
Staffordshire UK
Calypso Red Offline OP
Just Getting Started
Calypso Red  Offline OP
Just Getting Started

Joined: Aug 2017
Posts: 86
Staffordshire UK
They are the right wheel cylinders, or should I say, they are the ones that were on the car when I collected it new from the Factory!


Calypso Red
1994 +8 BMW Calypso Red.
2002 4/4 4 seater BMW Calypso Red.
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601171
26/10/19 05:39 PM
26/10/19 05:39 PM
Joined: Dec 2008
Posts: 18,585
South Yorkshire
DaveW Online content
Roadster Guru
DaveW  Online Content
Roadster Guru
Member of the Inner Circle

Joined: Dec 2008
Posts: 18,585
South Yorkshire
I'm intending to do this job on my 2005 before Christmas. So I'll be interested to see how it pans out.


DaveW
2005 Corsa Red Roadster S1
2016 Saffron Yellow (Narrow) AR Plus 4
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601199
26/10/19 09:59 PM
26/10/19 09:59 PM
Joined: May 2012
Posts: 943
Devon
Moggo Offline
Talk Morgan Regular
Moggo  Offline
Talk Morgan Regular

Joined: May 2012
Posts: 943
Devon
I replaced rear brake cylinders on my 2008 4/4 a couple of years ago. No need to remove the hubs.
The cylinders are a push fit into the hub and are held in place by a skinny circlip from the outside. Its a rather fiddly job to get the right size nose pliers to grip the clip. Try using a mirror and good lighting to better see what you need to get hold of.


Graham

1.8 4/4 Ivory.
Toyota Yarris
Volvo V70
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601200
26/10/19 10:18 PM
26/10/19 10:18 PM
Joined: Dec 2011
Posts: 1,943
Seattle, USA
B
Button Offline
Talk Morgan Enthusiast
Button  Offline
Talk Morgan Enthusiast
B

Joined: Dec 2011
Posts: 1,943
Seattle, USA
I have access of a hub puller. BUT: I have used a 3 leg cheap Made In China Puller. After removing cotter key, axle nut and washer, fit puller and tighten. I use a 1/2" flex bar 18" long and tighten - a lot. Use 2 1/2 lb sledge and pound on the screw of the 2 jaw puller. Stand back so it does not take Your leg out also. So when You tighten it so tight and pound so much You are afraid to do this anymore. Go to bed - it will often come off during the night. Be careful - I put a big dent in Mrs. Button XJ6 door. If this doesn't work You must pull the axle and take it to a Machinist who has a 50 ton press.


Button
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601202
26/10/19 10:22 PM
26/10/19 10:22 PM
Joined: Apr 2017
Posts: 1,126
Staffordshire
IvorMog Offline
Has a lot to Say!
IvorMog  Offline
Has a lot to Say!

Joined: Apr 2017
Posts: 1,126
Staffordshire
The cylinders can be a very tight squeeze to get off over the hub without removing it but on my 1999 model it was just possible.

Did them last month and the worst part was getting the new circlip to fit.


Bob

1999 4/4 2 litre Zetec
Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601205
26/10/19 11:41 PM
26/10/19 11:41 PM
Joined: Dec 2009
Posts: 24,579
Devonshire
+8Rich Offline
Member of the Inner Circle
+8Rich  Offline
Member of the Inner Circle

Joined: Dec 2009
Posts: 24,579
Devonshire

I replaced the rear cylinders on my 1999 Plus8 three years ago and it's straight forward enough, the only bind was putting the circlips back on but Gomog is your friend in that department with a handy tip.


Regards Richard

1999 Indigo Blue +8
2009 4/4 Sport Green prev
1994 Connaught Green +8 prev





Re: Removal of splined rear wheel hub. [Re: Calypso Red] #601225
27/10/19 09:36 AM
27/10/19 09:36 AM
Joined: Dec 2011
Posts: 296
South West France
C
CBY Offline
Learner Plates Off!
CBY  Offline
Learner Plates Off!
C

Joined: Dec 2011
Posts: 296
South West France


Regards
2005 PLUS 4
Re: Removal of splined rear wheel hub. [Re: Button] #601233
27/10/19 11:35 AM
27/10/19 11:35 AM
Joined: Aug 2015
Posts: 845
A
Arwyn Williams Offline
Talk Morgan Regular
Arwyn Williams  Offline
Talk Morgan Regular
A

Joined: Aug 2015
Posts: 845
Originally Posted by Button
I have access of a hub puller. BUT: I have used a 3 leg cheap Made In China Puller. After removing cotter key, axle nut and washer, fit puller and tighten. I use a 1/2" flex bar 18" long and tighten - a lot. Use 2 1/2 lb sledge and pound on the screw of the 2 jaw puller. Stand back so it does not take Your leg out also. So when You tighten it so tight and pound so much You are afraid to do this anymore. Go to bed - it will often come off during the night. Be careful - I put a big dent in Mrs. Button XJ6 door. If this doesn't work You must pull the axle and take it to a Machinist who has a 50 ton press.


Button - you don't need to pull the whole axle to take it to a machinist, easy enough to take the halfshaft out. 30 ton press has been ample for me with the worst coming off at about 20 tonnes indicated

Arwyn

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