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        General >> Problems >> Cat removal
        
(Message started by: mike on May 20^th, 2007, 10:37am)

Title: Cat removal
Post by mike on May 20^th, 2007, 10:37am

I just got a pair of new cats on eBay from Germany so am in the process of dropping the old ones. Well, said process is taking a lot longer than expected! The LHS came out fine, but the RHS is putting up a fight. The three nuts have been removed, the flange dropped about a quarter of an inch but it will go no further. I am able to move it in all directions (except down!) so I am dumbfounded. I don't want to use too much force for fear of breaking one of the (thin) ears on the manifold.
Any advice? I would prefer to leave the manifold in place as I have no source for new gaskets.
Cheers,
Mike

Title: Re: Cat removal
Post by drawlings on May 20^th, 2007, 1:41pm

Hi Mike, from experience of the RHS Cat I have had to remove the manifold, you can get to the bolts a little easier. Also, you can use heat to try a losen the bolt.

HTH

Cheers

Dan

Title: Re: Cat removal
Post by - Mike - on May 20^th, 2007, 4:13pm

Are you removing the original Ford cats or after market ones ???
The set up is different for non geninue cats as they have no studs on them. There is one stud (nearest the engine) which is attached to the manifold and is re-used whilst the other holes which would have had the studs on the cats are simply replaced with a nut and bolt.

I found that to assist in dropping the RH side it became a good idea to also do an oil change, for with the oil filter removed it made a clear path for it to drop unhindered.

REMEMBER:To insert the fire ring gasket between the cat and the manifold before refitting.

Also make sure you paste a plenty when inserting the cats into the flexy pipes. If you don't like me you will have to remove the flexies from the centre box and re-do the seal (next week), other than that it means dropping the the cats' again and doing it all over again. >:(

Hope this helps

Mike

Title: Re: Cat removal
Post by cossie_al on May 20^th, 2007, 6:09pm

When you say right hand side do you meen on the right when looking into the engine bay? If so there are four bolts on mine.
This does not realy help with getting them off, but if you intend to use assembly paste on the manifold flange do so sparingly as if any of it finds its way into the cat it won't last long.
Personaly I prefer not to use any engine side of the cats. If you get the gasket spot on central you should be okay.

Title: Re: Cat removal
Post by mike on May 20^th, 2007, 7:02pm

It took a fair amount of not so gentle persuasion but that's it, cat is finally out! :)
The cause of my difficulties was immediately obvious: these are original Ford with two studs attached. The top nuts had been an absolute p*ig to remove, I had to use tremendous force on a long breaker bar, stripping the threads but also bending the studs in the process, and that's what caused it to jam . I would have been better off if the studs had just sheared off.
By the way the new cats are aftermarket but come with studs like the original. There is no way I am going to use the type of self locking (?) nuts that Ford originally installed though. I feel lucky I was able to remove them at all! Replacement will be regular nuts with lockwashers and copper grease on the threads.
But that will be next week-end's task.
Thanks to all for your advice!
Cheers,
Mike

PS: RHS is starboard ;)

Title: Re: Cat removal
Post by Dave2302 on May 21^st, 2007, 4:00pm

Quote:

PS: RHS is starboard

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