28 replies to this topic

[R3D VX]

Well worth doing people! 3Hrs labour, a lifetime of pleasure!!

[WoodenDummy]

Well worth doing people! 3Hrs labour, a lifetime of pleasure!!

Yeah but they will have to go back on for the MOT, right?

[R3D VX]

Nah, the pre cat is not required for the MOT, (I am reliably informed by some long standing members!) It was put on so the car can pass Euro 4/5?? emissions regs in 2004ish. As the car is already sold it will not need to pass these levels.

[Ricky2772]

Nah, the pre cat is not required for the MOT, (I am reliably informed by some long standing members!) It was put on so the car can pass Euro 4/5?? emissions regs in 2004ish. As the car is already sold it will not need to pass these levels.

pre kat is there only for cold start emissions.

[TheRockstar]

Anyone know what size the bolts are in case I break one doing the work? (I'd rather get a couple from work before starting the job ) Ta Nick

Edited by TheRockstar, 02 April 2003 - 12:28 PM.

[Ricky2772]

13 mm bolts about 30 mm long, around 6mm thread diameter with auto-locking nuts (not the plastic-ring kind!).

[Marco]

maybe we should have a section on the site for guides on how and why to do things like this..?

[TheRockstar]

13 mm bolts about 30 mm long, around 6mm thread diameter with auto-locking nuts (not the plastic-ring kind!).

So you mean M6x30 bolts with a 13mm head?....and what do you mean by auto locking nuts?....(I assume you mean not 'Nyloc' nuts which are the ones with the blue plastic bit - not sure what other kind of self locking nuts there are...?.. )

Agree with the idea Marco, a 'How To' section would be good..... Thorney, I'd be happy to pull this together if everyone sends me the details.....

ta

Nick

Edited by TheRockstar, 02 April 2003 - 02:45 PM.

[Dragracer]

Nick, Yep, the bolts are M6 x 30mm. The nuts are all metal self lockers, ie the very top of the nut is slightly crimped into a triangular shape. The same idea is often used on one piece rocker arm adjusting nuts on Ford and Chevrolet V8's. I took out the pre-cat a couple of weeks ago. A pretty straightforward dissembly, but the foil matrix of the cat must be the most awkward metal in the world. A really sharp cold chisel was the best thing I found, working around the whole outer edge first, then slowly collapsing it so it can be twisted out. I slowly collapsed into a pot of tea afterwards.... Seriously tho' WEAR A DUST MASK when you are splitting the cat element from the pipe. Palladium and God knows what else will get into your respiratory tract otherwise. Best of luck, Chevy...

[TheRockstar]

Aha... know the nuts you mean....Guess I'll get onto it soon (once they sort out my frikkin steering pull problem!!!...)

[Ricky2772]

Nick,
Yep, the bolts are M6 x 30mm. The nuts are all metal self lockers, ie the very top of the nut is slightly crimped into a triangular shape.

ahh, thanks for the techie-english lesson....
"metal self lockers" is what I meant.... not triangular though , mine are just tighter et the end, with a softer metal edge that squeeze around the bolt....just finished using'em installing the backbox...got new steel bolts for the fecking "curve", by far the worst part to refit/adapt when installing a different exhaust...had to mod the clamp, and the heat shield
....after 3 curse-ful hours, now it's up at least....tomorrow morning I will tighten up everything, so that the bodyshells can be re-installed and painted anew....

[Duncan]

Don't hold my trainspotter knowledge against me, but M8 bolts have a 13mm A/F head not M6's. Really should get out more. Which should change when I get my car! You should also replace any gaskets at the same time (if there are any).

[andym172]

Is there any possibility that somebody could provide step-by-step instructions for removing the pre-cat. I'm pretty crap when it comes to the mechanical side of things so don't want to stuff it up. Any advice would be greatly appreciated! Andy.

[Ricky2772]

http://www.vx220.org...f=9&t=597&st=15

..hint: if you are crap with mech. work, then don't even start it...

Edited by Ricky2772, 10 April 2003 - 06:57 AM.

[andym172]

http://www.vx220.org...f=9&t=597&st=15

..hint: if you are crap with mech. work, then don't even start it...

Merci!

Andy.

[R3D VX]

It is quite a straight forward job, but if something goes wrong (bolts snap/sheer off, or the mesh wont break down) you may find that you have a car that is going nowhere! It took pros 3hrs on my car, i think i could get that down to 2ish but they had all the backup required (Oxysettelene to heat/melt bits, new bolts etc) plus they broke their tools not mine!!! (drill bits, chisels etc.) Would recommend getting a garage to do it. Mike

[VEX]

Hi Mike, Hi-Q are more than happy to do mine as well. Just got to juggle times around to be able to get in there mid week. They think 2 to 2.5 hours 'cause of the number of bolts in the undertrays. He did say you had a very big grin on your face when tested it up the road! Chris.

[TheRockstar]

You fellas got the phone number for Hi-Q, and the name of the guy you're dealing with?... I feel I may have to take a trip down to MK soon to get mine done..

[BogBrush]

Do Hi-Q remove the gubbins from the pre cat as well? Still interested in this. Colin