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[venom]

I'm replacing the cats on my 2.5 V6 tomorrow, now I got all the fixings & gaskets from VX but when I've looked at the join on the manifolds/cats it looks like it's a stud on the manifold & just a nut on the cat side but I've been given just bolts from VX no nuts ?
So whats the right combo to fix it up 1: Stud in manifold & nut cat side or 2: VX bolt through cat side & threads into the manifold, one of them is wrong but don't know what one as the more I go through the car it looks like it was maintained by KIRB SIDE GARAGE & sold by BODGE IT & FLOG IT car sales 

[Darth Loo-knee]

Every CAT I have removed which is a few, you will undo two nuts on each CAT leaving a stud in the exhaust manifold. Hope that makes sense. 

[venom]

Every CAT I have removed which is a few, you will undo two nuts on each CAT leaving a stud in the exhaust manifold. Hope that makes sense. 

Yes mate I was just wondering why VX gave me bolts instead of nuts  as they had to order all the bits in, so they will get them back Tuesday, cheers Daz 

[albitz]

When I have done it (only twice tbh) the studs have sheared off, and I had to drill them out and fit a bolt and nut.

[venom]

When I have done it (only twice tbh) the studs have sheared off, and I had to drill them out and fit a bolt and nut.

That's what I'm afraid of, can you drill them out in situ or do you need to remove the manifolds

[RobG]

Good soak in "Plusgas" couple of longish extensions on the end of a torque wrench. Make the nuts fly off

[albitz]

I did them in situ with just the fron of the car up on ramps, but it was hard work. Especially on the arms.
Got through quite a few drill bits as well.

[RobG]

I did them in situ with just the fron of the car up on ramps, but it was hard work. Especially on the arms.
Got through quite a few drill bits as well.

Surprised you didn`t try a 3/8" ratchet

OP, if you have to drill the studs out you need cobalt drill bits

[venom]

Good soak in "Plusgas" couple of longish extensions on the end of a torque wrench. Make the nuts fly off

Cheers Rob soaking as we speak 

[Darth Loo-knee]

I must have been lucky then as I haven't had one break yet :-?

[RobG]

Good soak in "Plusgas" couple of longish extensions on the end of a torque wrench. Make the nuts fly off

Cheers Rob soaking as we speak 

Let`s hope yours undo as easy as mine did Ken

[venom]

I did them in situ with just the fron of the car up on ramps, but it was hard work. Especially on the arms.
Got through quite a few drill bits as well.

Cheers Albs 

[Darth Loo-knee]

Mind you knowing Stan Laurel he probably tightened the bloody things up

[Elite Pete]

IIRC the early Omega had bolts into the manifold but I can't remember what year they were changed to nuts . The cat end is will more than likely need drilling and nuts and bolts using.

[MutantCav]

Never had a bolt snap while taking cat nuts off (2 nuts per cat) although regularly need a breaker bar...generally 16mm nuts (unless some muppet has put the wrong ones on when changing the cats) which is handy as you can use a size 10 spark plug socket which happens to be an extended 16mm, perfect for the job...a little awkward to get up to the nuts and will need a couple of extension bars to get the job sorted

As for the exhaust end of the cats, the bolt should bolt through the exhaust directly into the cat...obviously on many older cats the hole and/or thread has rusted away so you will find the bolt secured by a nut...13mm that end

Dont forget to unplug the wire into the lambda sensor before dropping the cat down