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Replacing 3 way union on rear axle #741738
12/05/22 07:54 PM
12/05/22 07:54 PM
Joined: Apr 2021
Posts: 132
San Francisco
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RobFog Offline OP
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San Francisco
I'm slowly replacing parts on the car, starting from the brakes and, as I learn the hard way, gradually making my way to the engine.

I need to replace the 3 way brake union on the rear axle - looks like the only unions now available are differently configured and, due to the thickness of the union, I can't seem to make the original axle clamp fit as the bolt through the union tightens up before the clamp is tightened to the axle.
Hope that makes sense. If somebody else has replaced their union do you have any tips or images of what you used. The axle is 7 inches in diameter and I've searched for clamps etc without success.

Picture of picture of old and mew tees .


1974 4/4 2 seater
Re: Replacing 3 way union on rear axle [Re: RobFog] #741744
12/05/22 08:27 PM
12/05/22 08:27 PM
Joined: Feb 2013
Posts: 246
Ross-on Wye, Herefordshire
bilibib Offline
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Ross-on Wye, Herefordshire
Originally Posted by RobFog
I'm slowly replacing parts on the car, starting from the brakes and, as I learn the hard way, gradually making my way to the engine.

I need to replace the 3 way brake union on the rear axle - looks like the only unions now available are differently configured and, due to the thickness of the union, I can't seem to make the original axle clamp fit as the bolt through the union tightens up before the clamp is tightened to the axle.
Hope that makes sense. If somebody else has replaced their union do you have any tips or images of what you used. The axle is 7 inches in diameter and I've searched for clamps etc without success.

Picture of picture of old and mew tees .

I think you mean 7 inches in circumference






Owen
"bilibib"
1982 4/4 Twin Cam
Royal Ivory, Dark Red Leather
Re: Replacing 3 way union on rear axle [Re: bilibib] #741755
13/05/22 12:37 AM
13/05/22 12:37 AM
Joined: Apr 2021
Posts: 132
San Francisco
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RobFog Offline OP
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San Francisco
Originally Posted by bilibib


I think you mean 7 inches in circumference




I do indeed - thanks, that's why it took me multiple attempts to get my maths GCSE


1974 4/4 2 seater
Re: Replacing 3 way union on rear axle [Re: RobFog] #741763
13/05/22 07:31 AM
13/05/22 07:31 AM
Joined: Aug 2015
Posts: 1,155
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Arwyn Williams Offline
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Why does the union need replacement?

If the threads are ok then put it in a small jam jar full of cellulose thinners and the old paint will just dissolve off and it will come out like new.

Another method is to heat it with a gas blowlamp or hot air gun and give it a wire brushing, again it will come up like new

Arwyn

Re: Replacing 3 way union on rear axle [Re: Arwyn Williams] #741790
13/05/22 12:57 PM
13/05/22 12:57 PM
Joined: Apr 2021
Posts: 132
San Francisco
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RobFog Offline OP
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Originally Posted by Arwyn Williams

Why does the union need replacement?

Arwyn



Unfortunately, the threads aren't ok . The union I received seems to be the standard replacement part as offered by Melvyn Rutter and Morgan Motors of New England, but, because the bolt hole is that much larger than the original, I can't tighten the clamp sufficiently to keep it rigid on the axel. I've searched for axel clamps but nothing suitable comes up, not sure if there's another kind of clamp or brace I could be using for my search terms.


1974 4/4 2 seater
Re: Replacing 3 way union on rear axle [Re: RobFog] #741796
13/05/22 01:38 PM
13/05/22 01:38 PM
Joined: Jun 2015
Posts: 1,064
North Somerset, UK
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North Somerset, UK
Not sure of the clamping arrangement but I guess it’s simply there to prevent the union and pipes wobbling about, so no great mechanical force is needed. If all else fails, can you not improvise with a large Jubilee Clip (hose clamp) to clamp a small bracket to the axle and then bolt through to that bracket?


Doug

2011 +4 in Rich Maroon
1972 750 “ComDom” sprinter
1958 Triton 650
1992 Triumph Trophy 900
Re: Replacing 3 way union on rear axle [Re: Deejay] #741807
13/05/22 03:32 PM
13/05/22 03:32 PM
Joined: Apr 2021
Posts: 132
San Francisco
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RobFog Offline OP
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San Francisco
Originally Posted by Deejay
Not sure of the clamping arrangement but I guess it’s simply there to prevent the union and pipes wobbling about, so no great mechanical force is needed. If all else fails, can you not improvise with a large Jubilee Clip (hose clamp) to clamp a small bracket to the axle and then bolt through to that bracket?



Thanks Deejay, I was considering whether a Jubliee Clip would give it a sufficient rigidity, let me try that.

I've learnt so many new terms and phrases on this site that I was wondering if there was a specialized axle clamp - a Windsor Sprocket, a Cleveland Beebop or something similar that served this exact purpose

Just for the record, here's how it currently looks in case my original description wasn't sufficient.


1974 4/4 2 seater
Re: Replacing 3 way union on rear axle [Re: RobFog] #741813
13/05/22 03:59 PM
13/05/22 03:59 PM
Joined: Oct 2019
Posts: 2,772
Aberdeenshire
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Talk Morgan Expert
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Talk Morgan Expert

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Aberdeenshire
Couldn't you just put a strip of rubber or aluminium under the clamp round the axle for it to nip up on?

K

Re: Replacing 3 way union on rear axle [Re: RobFog] #741824
13/05/22 04:57 PM
13/05/22 04:57 PM
Joined: Jun 2019
Posts: 342
Bethel, CT USA
PaulyG Offline
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Bethel, CT USA
I can't remember how it looks on mine, but does the clamp go to either side of the TEE? And now the new TEE is thicker so the ends of the clamp are farther apart?

If so, can you just put both sides of the clamp on the same side of the TEE? Maybe use a longer bolt?


1973 4/4 2 place
Re: Replacing 3 way union on rear axle [Re: RobFog] #741832
13/05/22 07:32 PM
13/05/22 07:32 PM
Joined: Jul 2019
Posts: 2,395
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Luddite Offline
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I guess that that it is desirable that the "T" is firmly fixed to the axle to resist any chance if it moving under any stresses that may be imparted upon it by the flexy pipe movement as the axle rides the bumps, and which could then be transferred to the brake pipes risking fracture in time..?

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