Jag XFR knocking noise from engine, very worrying
Discussion
from the thread you are talking engine replacement. Hopefully you will get an admission from the garage , if not look at a salvage engine from a wreck. £2.5K for a 4.2 or do you have 5.0? Superchargers are generally reliable and easily picked up second hand. Changing the oil is easy on the 4.0 and 4.2 just take the belt off, remove the oil feed plug , allen key 8mm. Use a syringe to remove old oil, then reverse to re-fill. No warranty, no use main dealer
Had a phone call this morning, confirmation that the Supercharger is at fault.
The technician will now sit down a create a report as to what is needed to repair this.
The shocker is that the JMD will be speaking on my behalf (without any intervention from me), to Jaguar Landrover UK, to cover this, even though the car is out of warranty.
The JMD feel that the supercharger should not have failed, even though the car is 8 years old and has about 77K miles on the clock.
So hopefully i should get a phone call later today to let me know how this pans out, fingers crossed.
The technician will now sit down a create a report as to what is needed to repair this.
The shocker is that the JMD will be speaking on my behalf (without any intervention from me), to Jaguar Landrover UK, to cover this, even though the car is out of warranty.
The JMD feel that the supercharger should not have failed, even though the car is 8 years old and has about 77K miles on the clock.
So hopefully i should get a phone call later today to let me know how this pans out, fingers crossed.
I agree a bit odd, but i'm not going to rock the boat at the moment. Everything has been written down and dated, well as you can see above.
Not sure why they would say that it wasn't the SC and then state that it was the SC, but yes i am curious as to why they have said this.
I was under the impression that if there is a noise from the engine, with the SC disconnected, then there is an engine issue? How can the SC emit a noise if it's disconnected?
Not sure why they would say that it wasn't the SC and then state that it was the SC, but yes i am curious as to why they have said this.
I was under the impression that if there is a noise from the engine, with the SC disconnected, then there is an engine issue? How can the SC emit a noise if it's disconnected?
XFRFred said:
I agree a bit odd, but i'm not going to rock the boat at the moment. Everything has been written down and dated, well as you can see above.
Not sure why they would say that it wasn't the SC and then state that it was the SC, but yes i am curious as to why they have said this.
I was under the impression that if there is a noise from the engine, with the SC disconnected, then there is an engine issue? How can the SC emit a noise if it's disconnected?
Quite so, but if they weren't scheduled to do any servicing on the supercharger and it subsequently failed, then it's your problem. If the engine is at fault, though, then the finger of suspicion points more certainly in their direction as they serviced it. Therefore, they may wish to move the attention away from the engine. Ultimately futile, of course, because you will eventually get to the bottom of it.Not sure why they would say that it wasn't the SC and then state that it was the SC, but yes i am curious as to why they have said this.
I was under the impression that if there is a noise from the engine, with the SC disconnected, then there is an engine issue? How can the SC emit a noise if it's disconnected?
If the belt is removed from the supercharger pulley, do the internals still move and potentially cause noise?
I've just had another chat with them to ask why i was told on the 30th that is wasn't the SC, and now it is the cause.
Their reply was that some of the "isolator springs" could have been at fault and this could have caused the noise.
I've just had another chat with them to ask why i was told on the 30th that is wasn't the SC, and now it is the cause.
Their reply was that some of the "isolator springs" could have been at fault and this could have caused the noise.
The only scenario that I could come up with, if they say that there was still a noise with the SC belt removed and now they are saying that the SC is a fault, would be that some part of a supercharger rotor or bearing or casing has been eaten by the engine via the intake system. This could get past inlet valves and be hammered by the piston crown with a noise not unlike the one you posted.
Surely they have enough experience to know that replacing a supercharger would not cure the problem in this case.
Maybe Jaguar are asking them to remove the charger and look for missing bits before proceeding.
Hopefully JLR will end up with the whole tab.
Ian
Hm,
Isolator springs on which component?
Surely they have enough experience to know that replacing a supercharger would not cure the problem in this case.
Maybe Jaguar are asking them to remove the charger and look for missing bits before proceeding.
Hopefully JLR will end up with the whole tab.
Ian
Hm,
Isolator springs on which component?
Edited by Orcadian on Tuesday 3rd January 13:45
Edited by Orcadian on Tuesday 3rd January 13:46
Even if they are known to 'go' as they say, then if they had removed the belt, surely they were out of the equation altogether? If JLR say that the SC should not have had a fault at that age and mileage, then if the engine has had a meal of SC bits, then it's not your fault either.
Hopefully JLR will send an expert techie to see this car sometime soon.
Ian
Hopefully JLR will send an expert techie to see this car sometime soon.
Ian
I've not replaced a 5.0L Supercharger but did do the one on my old 4.0 XKR several times as I tracked down a rumbling noise at tickover (kind of like marbles being rolled around a tincan).
One of the things that can cause this is the preloaded spring used in the pulley shaft to smooth the action of the belt against the internal bears of the supercharger. It's shaped ike a puck, about 2" across. The originals have a spring built into them to absorb a bit of shock as the belt applies power through the shaft to the gears in the S/C. THese were known to 'go' and changing/upgrading to solid rubber ones was the fix.
The S/C in the 5.0 is a newer version so it may be different, but I can't really see how they could have run the engine without the belt connected heard the noise confidentally eough to say it's not the S/C, then change their minds later and say it is the S/C.
I have two cars with this engine/SC combo now, the FFRR occasionally has a knocking noise at tickover, but I'm putting that down to one of the engine pulleys for now until it either becomes constant or something breaks!
One of the things that can cause this is the preloaded spring used in the pulley shaft to smooth the action of the belt against the internal bears of the supercharger. It's shaped ike a puck, about 2" across. The originals have a spring built into them to absorb a bit of shock as the belt applies power through the shaft to the gears in the S/C. THese were known to 'go' and changing/upgrading to solid rubber ones was the fix.
The S/C in the 5.0 is a newer version so it may be different, but I can't really see how they could have run the engine without the belt connected heard the noise confidentally eough to say it's not the S/C, then change their minds later and say it is the S/C.
I have two cars with this engine/SC combo now, the FFRR occasionally has a knocking noise at tickover, but I'm putting that down to one of the engine pulleys for now until it either becomes constant or something breaks!
I seriously doubt the supercharger is the issue. If the belt is removed I would have expected the noise to have changed. The supercharger was spinning and now isn't, and if the noise is the same in two different states it doesn't take much to work out this doesn't add up.
If the garage want to replace the charger you need hard proof that it is at fault. At the moment it feels like guess work.
The noise is also too fast in my opinion to be in time with engine revolutions. From experience a bottom end failure is a rhythmic knock, knock, knock in time with the engine. This noise sounds like a rattle and also sounds like the noise is a little inconsistent.
I have heard a similar noise on my M3 Evo before, it turned out to be the chain tensioner and guide. The timing chain was rattling against it. It eventually got to the point the knock sensors picked it up and threw a check engine error.
If the garage want to replace the charger you need hard proof that it is at fault. At the moment it feels like guess work.
The noise is also too fast in my opinion to be in time with engine revolutions. From experience a bottom end failure is a rhythmic knock, knock, knock in time with the engine. This noise sounds like a rattle and also sounds like the noise is a little inconsistent.
I have heard a similar noise on my M3 Evo before, it turned out to be the chain tensioner and guide. The timing chain was rattling against it. It eventually got to the point the knock sensors picked it up and threw a check engine error.
Edited by MattM3 on Wednesday 4th January 11:23
Let's go right back to your first post on this - you said that it occurred just 20 miles after picking it up - suspicious in itself. You also said that the engine management light came on with the restricted performance message. If the RP message was transient then it may not have thrown a code but the CEL would have stored a code - did the JMD check that?
Also there is no sensor on the Supercharger which could cause lights to come up - unless it was clapping its nuts off and caused a knock sensor to report. I would ask for a breakdown of what they checked, how they checked it and in what sequence. I would still press VERY hard for an expert tech man from JLR to visit before they proceed.
Ian
Also there is no sensor on the Supercharger which could cause lights to come up - unless it was clapping its nuts off and caused a knock sensor to report. I would ask for a breakdown of what they checked, how they checked it and in what sequence. I would still press VERY hard for an expert tech man from JLR to visit before they proceed.
Ian
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