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Discussion Starter #1
OK., so this is only on cold start that I get this temporary rattle for about 3 seconds, then all sounds fine. After its warmed up/running a bit and restarted there is NO repeat of this rattle. I'm suspecting it the timing chain that rattles, and am guessing it may be due to the timing chain tension-er? Does anyone know if they are oil pressured to tension the chain? It's about a 30 hour job to get a tension-er replaced (no small feat) !!! Has anyone had any experience here?
 

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Not really sure about the TDI's but I've read on here in a thread that the gassers do this on a cold startup until the oil pressure builds up. Maybe the same?


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My VR6 3.2 does this with the rpm around 1100 for a few seconds and calms down. Treg was bought second hand. My audi does it too. Audi has always done it from new. System needs to warm up a bit before settling down. It's not a big rattle though, just like you're applying the throttle a bit. There is some mild chain slapping going on then rpm goes to 700/800. Not sure about TDIs.
 

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Do you have relatively thick white exhaust right after start that does stop in a short time? Condensate water or coolant might be involved. Seeping through head gasket or EGR cooler.
 

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Discussion Starter #7
A diesel rattle is caused by diesel rattle (aka diesel clatter).

Cold fuel on start > compression ignition knock. It will also do it under lugging conditions. It's what diesels do.

More noticable post-emissions "fix."
Ok. yeah, I know what diesel clatter is... but this is more like a timing chain rattle for the first 2-3 seconds on cold start only as stated above. No smoke (white) on start up, and absolutely no clatter rattle after things are warmed up. I had VW repair a timing chain cover gasket leak 6 months ago. No noise till now? Anyway, a timing chain replacement is like 4 gran, a new engine is more like 11 gran . Don't really care for either. :)
 

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I don't understand what you just attempted to say.... Translate that to Canadian please....

How much milage on the vehicle?
At what milage and date was the FIX done?
The emission fix will cover a timing chain issue......
 

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Discussion Starter #11
Thick fingers.. sorry, I was born and raised in Ontario ,by the way..., I have 170 K on the clock. VW just told me the timing chain is not covered under the emission fix warranty even though I am still in the time frame. Are they lying?
 

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Discussion Starter #13
So, I called 2 different VW dealer shop service department, and timing chain is Not covered. It is not mentioned in the article you sent me either, so how does one argue that?
 

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If you've been around the vehicle industry, you'll know that a "long block" is and entire assembled engine, minus the accessories (such as external alternator, a\c compressor, P/S pump, etc).

How does anyone argue that the timing chain is not part of the valve train which is clearly mentioned. What system is the timing chain part of?
 

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So... I was about to make a post on this issue but there's already one.


I've noticed on my '13 3.0L TDI that immediately after startup there is an odd rattle that goes away. I'm fairly sure it has been there since I bought the car July 2018 with 76K. I'm now at 96K and was doing some internet research on the TDI and came accross a thread about common 3.0 TDI issues to watch out for. One of them was rattle on startup.



There are some posts on the Audi forums about it. It seems to be more commonly a problem on the 225 HP 3.0L TDI (ie pre 2012).



https://www.audi-sport.net/xf/threads/so-this-start-up-rattle-on-the-3-0-tdi.274005/
Question 3.0 TDi death rattle on start up
https://www.audiworld.com/forums/3-0tfsi-engine-discussion-193/audi-c7-3-0l-engine-tap-cold-start-2888930/


https://www.audiworld.com/forums/q7-discussion-112/3-0t-engine-rattle-startup-normal-2902257/page2/#post24831316





Here is what my '13 sounds like on startup. It's done it since I bought the vehicle. Now the question is whether its something to be concerned about or have repaired or if it is normal for the 3.0L TDI.


I wasn't sure how to attach an audio file on the forum, so I attached the audio file as a .txt file so if you download it you'll have to change the end of the file name from .txt to .m4a to listen to it (Windows will ask you if you are sure you want to change it, press ok, then open with your favorite audio player). Also you can select open with windows media player when you download and windows media player will read the file after giving you a warning that it doesn't know how to handle it.


Any ideas if this is normal or does this mean I need to replace the tensioners, guides and chains?
 

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turbospool
I have the same issue/rattle noise but not always:? like 8 of 10 cold start.
2014 3.0 TDI with 74k miles and only emission warranty.

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Discussion Starter #17
Yeah... I wish I knew too if this is serious? I actually found a dealer 1 hour away who agreed timing chain is covered under emissions warranty. I took it to them and after 4 days of starting it up they simply say they heard nothing amiss. I am beat out! I guess it will need to grenade the engine before I qualify for help. I have another 10 I before my warranty runs out.
 

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So clearly the timing chain (itself, and its tensioners, pulleys etc.) should be covered under "drivetrain."

But before we get this-- is there any pro-active measures to NOT have this happen?

-Ridwan
 

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Did you listen to the audio I posted above?

I just had some service done that included disssembling and reassembling timing chain components. My rattle may have gone away. I’ll have to double check it.

But have the dealer listen to the audio I posted. It’s maybe a half second rattle. At least they will know what to listen for...

It’s a 15+ hour job to get to the timing chains....
 
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