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2.7 hdi engine knocking noise when warm

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c5user   
Wed Nov 28 2018, 11:34am
Joined: Nov 28 2018
Member No: #3747
Location: Ostrava
Hello everyone. I was searching for similar issues. I have a C5 3.0Hdi. I have had replaced engine few years ago (at 120kkm), with a very much the same sound as the creator of this thread Rabenson. When cold, the engine was quiet, when warmed it rattled very much the same. The result was a loose crankshaft with a large amount of axial movement. That was diagnosed by having a pulley cover damaged by a pulley and then we removed the oil sump bottom cover to see the internals and tried to move the crankshaft and there was quite an axial movement. I guess it was the bearing issue or so. I was not doing any highway speeding or so, I never ran the car more than like 180km/h for a short period of time and I almost never used sport mode, just very occasionally for quick overtake. So the dealer replaced the whole engine. Fortunately the car was insured.

Now 4 years later and around 80kkm after, the engine is having a ticking/tapping sound when it warms up. Sort of very similar to Paulius. I was thinking it's an injector issue, but it is noticable even going down the hill without any power applied so it's not. I can hear that inside the car with no radio. Not really sure if this is related to cams or the crankshaft is again going loose. It does not sound that bad from outside, but I noticed that because few months before, the car had just a perfect clean sound compared to now.
3 User said Thank You to c5user for this Post :
 e3steve (28 Nov : 12:22) , cruiserphil (28 Nov : 16:47) , rabenson (29 Nov : 09:39)
C6-2006   
Sat Feb 23 2019, 04:00pm
Joined: Nov 25 2018
Member No: #3743
Location: Finland
Injector seal broken.

Paulius wrote ...

Finally a thread concerning tbe 2,7HDI sounds!

Mine sounds nice when cold, but when it's warm, it sounds like this:
- Click Here -
I think that it is a top-end tick or something related to cams/compensators. Also, there is this lower-frequency sound, that could be a fuel pump or something (?). I have no idea actually, ant it's quite annoying. Mechanics don't hear nothing.

However, I would say that this is a better sound than the one OPs engine produces... I would bet that it has something to do with low end..

1 User said Thank You to C6-2006 for this Post :
 321dave (23 Feb : 18:19)
321dave   
Sat Feb 23 2019, 06:44pm
Joined: Sep 09 2011
Member No: #614
Location: Dublin
C6-2006 wrote ...

Injector seal broken.

Paulius wrote ...

Finally a thread concerning tbe 2,7HDI sounds!

Mine sounds nice when cold, but when it's warm, it sounds like this:
- Click Here -
I think that it is a top-end tick or something related to cams/compensators. Also, there is this lower-frequency sound, that could be a fuel pump or something (?). I have no idea actually, ant it's quite annoying. Mechanics don't hear nothing.

However, I would say that this is a better sound than the one OPs engine produces... I would bet that it has

something to do with low end..





Just wondering did you notice a diesel spill around the injector base? I had similar issue with a diesel C5. It was the chuffing sound that gave it away.
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