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Author Topic: rusty cat converter  (Read 2669 times)

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Toledodude1973

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rusty cat converter
« on: 23 February 2019, 18:47:59 »

Looking under the Omega 2.6 today i noticed the heat shield outer casing on the cat converter was crusty and some of it is missing,is this a MOT fail . its not blowing and is it an expensive replacement thanks for any help
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Doctor Gollum

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Re: rusty cat converter
« Reply #1 on: 23 February 2019, 19:10:15 »

Can be secured with a large stainless jubilee clip or removed completely  ;)
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Nick W

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Re: rusty cat converter
« Reply #2 on: 23 February 2019, 19:14:11 »

You'll only ever notice a difference whether it's there or not if it rattles.
So remove them from each cat.


Easy :y
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Toledodude1973

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Re: rusty cat converter
« Reply #3 on: 23 February 2019, 19:36:46 »

so just break them away and no MOTworries
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Alnico Blue

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Re: rusty cat converter
« Reply #4 on: 23 February 2019, 20:49:21 »

You'll only ever notice a difference whether it's there or not if it rattles.
So remove them from each cat.


Easy :y

Nick . . . this "cat rattle" on my 2.6  I have a loudish rattle only when the car is started from cold , meaning overnight cold.  On cold  start up it rattles like hell for about 20 secs then fades completely after about a minute or 2.   This is coming directly from the drivers side cat from  the heatshield area.
I might try & remove the heat shield as it must be this that is causing the rattle.  I'm guessing as  the cat heats up something must be expanding & the rattle stops.

To remove . . . is it a case of just carefully grinding through the welds & the shield will then come away?

Or am I getting this totally wrong & its something in the cat rattling?  :-\ :-\

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annihilator

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Re: rusty cat converter
« Reply #5 on: 23 February 2019, 20:59:22 »

Depending on how rusted they are you can usually lever them off with a big Screwdriver /bar, however my rattle turned out to be the cats innards which had broken up and needed replacing.
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nellys coupe

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Re: rusty cat converter
« Reply #6 on: 23 February 2019, 21:15:38 »

its not an mot faliure so long as its not blowing, :y
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Nick W

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Re: rusty cat converter
« Reply #7 on: 23 February 2019, 23:09:29 »

You'll only ever notice a difference whether it's there or not if it rattles.
So remove them from each cat.


Easy :y

Nick . . . this "cat rattle" on my 2.6  I have a loudish rattle only when the car is started from cold , meaning overnight cold.  On cold  start up it rattles like hell for about 20 secs then fades completely after about a minute or 2.   This is coming directly from the drivers side cat from  the heatshield area.
I might try & remove the heat shield as it must be this that is causing the rattle.  I'm guessing as  the cat heats up something must be expanding & the rattle stops.

To remove . . . is it a case of just carefully grinding through the welds & the shield will then come away?

Or am I getting this totally wrong & its something in the cat rattling?  :-\ :-\


If it's the shields rattling you won't need a grinder, just some stout gloves to prevent you cutting your hands when pull the shield off. Once you've done that, give the cat body a thump with your fist. If that makes it rattle, the cat is knackered and needs to be replaced. They do tend to make a much heavier noise than just rotten shields though.
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Alnico Blue

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Re: rusty cat converter
« Reply #8 on: 24 February 2019, 13:42:32 »

Right  . . .tested as follows from cold this morning  ;)

started car   . . .noisy rattle from cat below drivers seat  . . .as soon as I touched the shield below the cat  firmly with a gloved hand  . . .noise stopped instantly  . . .took hand away &  noise started again .

so must be the shield .      Not decided if I will remove it as although annoying  . . .it only lasts for a minute or 2 from a totally cold start  :-\ :-\
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Doctor Gollum

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Re: rusty cat converter
« Reply #9 on: 24 February 2019, 14:11:03 »

It will fall off in due course... Wait until it rattles when warmed up and remove it. :y

Wait any longer and the person behind might be claiming off your insurance...
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dave the builder

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Re: rusty cat converter
« Reply #10 on: 24 February 2019, 15:05:19 »

It will fall off in due course... Wait until it rattles when warmed up and remove it. :y

Wait any longer and the person behind might be claiming off your insurance...
how will the car behind prove the part fell off the omega  :P
our roads are covered in car parts that fall off  ,nearly as many parts as pot holes  ;D

personally, i would wire or hose clamp the heat shields back on ,the sooner the cat gets warm ,sooner it works ,less chance of post cat lambda reading rich  :-\
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Migv6 le Frog Fan

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Re: rusty cat converter
« Reply #11 on: 24 February 2019, 18:23:06 »

There is a hell of a lot of heat which comes of cats when the car is running. I would be concerned that binning the heat shields would allow all that heat to damage things under there ?  :-\
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TheBoy

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Re: rusty cat converter
« Reply #12 on: 24 February 2019, 18:31:13 »

There is a hell of a lot of heat which comes of cats when the car is running. I would be concerned that binning the heat shields would allow all that heat to damage things under there ?  :-\
My old MV6 lost all its heatshields years and years ago, including the cat ones.  I reckon I drove it in such a way that the exhaust got pretty hot.

Never had an issue.
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cam.in.head

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Re: rusty cat converter
« Reply #13 on: 24 February 2019, 18:33:33 »

According to my not test station the shields are now part of the test and if originally fitted should be there at mot time.he said he will fail a car with a shield missing .like someone said earlier just jubilee clamp it secure or re screw the lip if there's any lip available to screw to !.
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Doctor Gollum

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Re: rusty cat converter
« Reply #14 on: 24 February 2019, 18:36:38 »

It will fall off in due course... Wait until it rattles when warmed up and remove it. :y

Wait any longer and the person behind might be claiming off your insurance...
how will the car behind prove the part fell off the omega  :P
our roads are covered in car parts that fall off  ,nearly as many parts as pot holes  ;D

personally, i would wire or hose clamp the heat shields back on ,the sooner the cat gets warm ,sooner it works ,less chance of post cat lambda reading rich  :-\
Rest assured, if the come through my windscreen, your insurers will be getting a phone call  ;)
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