fitting a Catalytic Converter on 1.8 turbo

MDMH757 · 6th January 2017, 12:01

Hi All,

I was wondering if there is anyone out there who has replaced a Catalytic Converter on a ZTT 1.8T......

For some reason previous owner removed the cat and replaced with a straight pipe.... so obviously when came to MOT time it failed even though runs on LPG 99% of the time.

MOT Tester said I had a "Massive" leak of exhaust gases from downpipe, so decided to get good used downpipe and new cat pipe.....

My question is when fitting the new cat pipe into the mid box (I think that's what it is called) does the old one just pull out or is it welded into the box so would I need to cut and leave a section of the old pipe protruding from the box so I can join the new cat pipe and fit a pipe clamp.

Any advice/knowledge how/what to do would be gratefully received...

Many Thanks

Maurice

T-Cut · 6th January 2017, 13:27

The aftermarket catalysts come a three holed flange at the flexi end and a slot-on or butt join fitting at the rear.

I notice the Xpart supplied catalyst includes the middle box and uses a butt joint, though the one I fitted years ago didn't. It was more like the aftermarket ones.

This is the current Xpart catalyst.

There's a metal shim gasket in the flanged joint. The rear joint used a conventional U-clamp or one of the MGR compression sleeves depending on the type.

The original exhaust is a one piece system, so any replacement section means cutting the relevant section out.

TC

6th January 2017, 12:01	#1
MDMH757 Loves to post Rover 75 Tourer Join Date: Mar 2009 Location: Bishop Auckland, Co. Durham Posts: 269 Thanks: 48 Thanked 64 Times in 50 Posts	fitting a Catalytic Converter on 1.8 turbo Hi All, I was wondering if there is anyone out there who has replaced a Catalytic Converter on a ZTT 1.8T...... For some reason previous owner removed the cat and replaced with a straight pipe.... so obviously when came to MOT time it failed even though runs on LPG 99% of the time. MOT Tester said I had a "Massive" leak of exhaust gases from downpipe, so decided to get good used downpipe and new cat pipe..... My question is when fitting the new cat pipe into the mid box (I think that's what it is called) does the old one just pull out or is it welded into the box so would I need to cut and leave a section of the old pipe protruding from the box so I can join the new cat pipe and fit a pipe clamp. Any advice/knowledge how/what to do would be gratefully received... Many Thanks Maurice

6th January 2017, 13:27	#2
T-Cut This is my second home Rover75 and Mreg Corsa. Join Date: Nov 2006 Location: Sumweer onat mote o'dust (Sagin) Posts: 21,752 Thanks: 341 Thanked 3,660 Times in 2,924 Posts	The aftermarket catalysts come a three holed flange at the flexi end and a slot-on or butt join fitting at the rear. I notice the Xpart supplied catalyst includes the middle box and uses a butt joint, though the one I fitted years ago didn't. It was more like the aftermarket ones. This is the current Xpart catalyst. There's a metal shim gasket in the flanged joint. The rear joint used a conventional U-clamp or one of the MGR compression sleeves depending on the type. The original exhaust is a one piece system, so any replacement section means cutting the relevant section out. TC