X350 deisel Catalytic Converters
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PacificBlue
- Posts:5
- Joined:Sat Oct 10, 2009 5:41 pm
I have just had to have both my cats changed at 62k miles on my XJ TDVi due to flex pipe failure. The symptoms are exhaust fumes in the cabin when stationary especially at start up. Anybody else had a similar problem or is this just rare bad luck? S.N.G. Barrat can supply reasonably priced cats if required. Jag cats are £650 + VAT.
Re: X350 deisel Catalytic Converters
If you have had both cats changed then I suspect at least one was a catalytic converter and not the DPF( diesel particulate fileter) The layout on the diesel of the catalytic converters is at either side of the V6 engine and the pipes from those enter the DPF under the floor of the car and then split again to the remaining exhaust parts at the rear to give the two outlet pipes under the boot.
The catalytic converters perform the same task as on petrol cars and remove the noxious gases but the DPF collects particulates( bits of soot) and then burns them off at regular intervals automatically.
I would suspect that one of the cats and the dpf are sold as one part and that the other cat is a separate part, but I would ask your dealer for details of what they have done and report back here.
There are companies that strip out the innards of the dpf and put in a neutral material. The engine management is then adjusted to pass the MOT test. The engine is supposed to be so clean that the DPF is only fitted to comply with the law but I have no experience of theDPF process I have described and as to whether it works long term.
Both the DPF and catalytic converters are expensive due to their Platinum content so the price does not surprise me. It is very annoying that it seems to be a mechanical failure of a flexy pipe, I wonder whether a decent garage could weld it up in any way?
Does anyone else have any DPF/Cat experiences?
The catalytic converters perform the same task as on petrol cars and remove the noxious gases but the DPF collects particulates( bits of soot) and then burns them off at regular intervals automatically.
I would suspect that one of the cats and the dpf are sold as one part and that the other cat is a separate part, but I would ask your dealer for details of what they have done and report back here.
There are companies that strip out the innards of the dpf and put in a neutral material. The engine management is then adjusted to pass the MOT test. The engine is supposed to be so clean that the DPF is only fitted to comply with the law but I have no experience of theDPF process I have described and as to whether it works long term.
Both the DPF and catalytic converters are expensive due to their Platinum content so the price does not surprise me. It is very annoying that it seems to be a mechanical failure of a flexy pipe, I wonder whether a decent garage could weld it up in any way?
Does anyone else have any DPF/Cat experiences?
Re: X350 deisel Catalytic Converters
Cat failure is relatively rare, I think.
Most instances of replacement that I have heard of tend to have been needed due to physical damage or due to the cat beginning to internally disintegrate due to high mileage wear and tear.
DPF filters are another matter. They seem to cause more problems than cats. I thought the article in our recent Jan 2012 magazine gave some particularly good advice re long service suggestions.
On the face of it, we all know a diesel makes sense with fuel having become so expensive. The downside is that many see the sense in running a diesel around town where given the same driving circumstances, running a petrol equivalent would be perhaps prohibitively expensive. When one then learns that DPF fitted cars may then suffer DPF blockage around town, the whole idea begins to fall down.
I did hear that it was Audi that flags up its A6 diesel as a vehicle that should not be used around town due to the unsuitability of the vehicle to operate reliably due to DPF issues.
Interesting debate.
Mike
Most instances of replacement that I have heard of tend to have been needed due to physical damage or due to the cat beginning to internally disintegrate due to high mileage wear and tear.
DPF filters are another matter. They seem to cause more problems than cats. I thought the article in our recent Jan 2012 magazine gave some particularly good advice re long service suggestions.
On the face of it, we all know a diesel makes sense with fuel having become so expensive. The downside is that many see the sense in running a diesel around town where given the same driving circumstances, running a petrol equivalent would be perhaps prohibitively expensive. When one then learns that DPF fitted cars may then suffer DPF blockage around town, the whole idea begins to fall down.
I did hear that it was Audi that flags up its A6 diesel as a vehicle that should not be used around town due to the unsuitability of the vehicle to operate reliably due to DPF issues.
Interesting debate.
Mike
X350 Co-ordinator
2004 XJR
2004 XJR
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PacificBlue
- Posts:5
- Joined:Sat Oct 10, 2009 5:41 pm
Re: X350 diesel Catalytic Converters
I am not sure how we got on to DPFs but mine is fine, (I fortunately no longer have to travel short distances in stop/start traffic). I actaully bought the diesel to drive back and forth to the Algarve as my old X300 4L Sovereign was becoming too expensive on fuel. I am sorry if I misled anyone when I referred to the offending pipe as 'Flex' it is in fact a thin walled vibration damper. As you know the top pipe from the catalytic converter (cat) attaches to a three stud flange on the turbo and at the lower end is bolted firmly to the gearbox. So unless the gearbox becomes detached from the engine there will be no movement in this pipe only vibration. I have now been onto another Jaguar forum and have asked questions in other areas, and find that this is not a rare failure. It seems to occur arround 60k, but I have no further information on how or why (maybe someone else has?). I have heard of them being welded but the attempt on mine was not successful. Very annoying as my cats are perfectly serviceable! The good news is that I have an update on the price - S.N.G. Barret can supply cats for £265.00 each + VAT. This is not an easy job. I was under my car when the cats were removed - all six studs sheared. The symptom of this fault is an exhaust smell when stationary, worse at start up.
Re: X350 deisel Catalytic Converters
Sorry I misunderstood your first post and am pleased that your DPF is fine. It was strange that both Cats needed replacing at the same time as they are on opposite sides of the engine, maybe I have misunderstood again?
So MK's anti diesel argument is slightly undermined
as petrol cars have cats too and your DPF is fine. I wish we had a visual of what needed replacing for future reference, did you see the part that came off the car?
So MK's anti diesel argument is slightly undermined
as petrol cars have cats too and your DPF is fine. I wish we had a visual of what needed replacing for future reference, did you see the part that came off the car?Re: X350 deisel Catalytic Converters
I to read the article on DPF's in this months mag and found it very informative. My tail pipes face down on my S Type so it looks like I don't have one.
I hope that the flexi's last longer on the S than they do on the 350!
Jeff.
I hope that the flexi's last longer on the S than they do on the 350!
Jeff.
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