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Author Topic: Changing backbox on estate  (Read 1115 times)

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Enceladus

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Re: Changing backbox on estate
« Reply #15 on: 16 April 2019, 10:54:36 »

How corroded (or not) were the ends of the centre pipes? Did you have to do anything to them?

Talk about waste not want not, you seem to have salvaged and reused the clamps, U bolts and nuts? Amazing!
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terry paget

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Re: Changing backbox on estate
« Reply #16 on: 16 April 2019, 12:39:40 »

How corroded (or not) were the ends of the centre pipes? Did you have to do anything to them?

Talk about waste not want not, you seem to have salvaged and reused the clamps, U bolts and nuts? Amazing!
The centre section pipes w








































































































































































































































































































ere considerably corroded, and needed a bit of filing and emery cloth to make them accept the silencer  The clamps and bolts were in surprisingly good condition. The hardest part of the job was getting the old pipe ends out of the silencer.
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terry paget

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Re: Changing backbox on estate
« Reply #17 on: 16 April 2019, 12:45:56 »

How corroded (or not) were the ends of the centre pipes? Did you have to do anything to them?

Talk about waste not want not, you seem to have salvaged and reused the clamps, U bolts and nuts? Amazing!
I'll try again. The central section pipes were considerably corroded and required filing and emery cloth to make them accept the silencer. The clamps and nuts were surprisingly well preserved.

The hardest part of the job was extracting the old pipe ends from the silencer.

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terry paget

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Re: Changing backbox on estate
« Reply #18 on: 16 April 2019, 22:16:10 »

Why not use a high temp silicone RTV sealant instead of greasing the joint for an easier assembly of a tight joint?. It allows the joints to slide together easily on assembly, provides a permanent gas tight seal, and seals any minor gaps like those on the last photo. If you need to seperate the joint at a later date, it can be done easily, whereas exhaust paste sets like concrete and is hard to separate any joints.
I use the red HT RTV on my all cars including classic cars, and if is far superior to exhaust paste in my opinion - simply for ease of use and it does the job perfectly.
Do you mean something like Loctite SI 5990? I used grease to ease the assembly, but I can imagine it being blown out and leaving a gas leak. I have long used SI 5990 to seal between cat sections and central sections.
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Doctor Gollum

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Re: Changing backbox on estate
« Reply #19 on: 16 April 2019, 22:20:08 »

The trouble with grease as an assembly paste of parts exposed to prolonged heat is that it eventually melts and flows out of the joint ;)

Silicon pastes of suitable grades won't be affected by the temperatures within the exhaust system, and so will remain in place :y
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terry paget

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Re: Changing backbox on estate
« Reply #20 on: 17 April 2019, 15:30:18 »


Is that better?
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Doctor Gollum

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Re: Changing backbox on estate
« Reply #21 on: 17 April 2019, 16:20:34 »

Does it blow?
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dave the builder

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Re: Changing backbox on estate
« Reply #22 on: 17 April 2019, 16:37:24 »

Does it blow?

Car has already passed MOT, and next April seems a long way away.

  :-X   :y    ;D :D
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terry paget

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Re: Changing backbox on estate
« Reply #23 on: 17 April 2019, 17:37:47 »

Does it blow?
Don't know yet. Tube says leave for 18 hours to cure.
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Doctor Gollum

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Re: Changing backbox on estate
« Reply #24 on: 17 April 2019, 18:13:44 »

 :y
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johnnydog

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Re: Changing backbox on estate
« Reply #25 on: 18 April 2019, 20:00:02 »

Does it blow?
Don't know yet. Tube says leave for 18 hours to cure.

There are high temp RTV silicones that cure a lot quicker than 18 hours - especially if you need to use the car relatively soon after using on / fitting the exhaust.
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terry paget

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Re: Changing backbox on estate
« Reply #26 on: 19 April 2019, 08:35:29 »

Does it blow?
Don't know yet. Tube says leave for 18 hours to cure.

There are high temp RTV silicones that cure a lot quicker than 18 hours - especially if you need to use the car relatively soon after using on / fitting the exhaust.
So there are! Quick search on e-bay produced half a dozen. Cheap too. I have bought a tube for next time.
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johnnydog

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Re: Changing backbox on estate
« Reply #27 on: 19 April 2019, 11:24:27 »

Last year I had remove the exhaust system on my 1976 Triumph to drop the gearbox which I had assembled in 2006 using this high temp RTV, and the joints came apart easily which you don't get with the cement / paste. It was a pure 304 stainless system which didn't have any corrosion issues which helped.
Another thing that helps is not to overtighten the clamps - D clamps are kinder on the tubing of the exhaust as opposed to U clamps. They require clamping relatively tight, but the silicone seals any minor gaps, and over tightening to get a good seal causes indentations in the tubing which then makes seperating difficult if needed at a later date.
A good quality exhaust should mate together like a glove with virtually no gaps whatsoever.
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terry paget

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Re: Changing backbox on estate
« Reply #28 on: 22 April 2019, 21:05:57 »

Does it blow?
No. Checked today, no leaks. I also found the my lost torch, trapped between the rear hangers.
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