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Discussion Starter #1
Good morning everyone,

I’ve recently discovered that my 2016 T3 TDI with 73k miles has the dreaded noisy chain tensioner issue. You can hear a definite rattle for a few seconds at start up then it goes away. Apparently this repair is a big ordeal involving dropping the transmission removing all the exhaust electronics and then finally removing the engine. Basically open heart surgery. So my question is has anyone or many experienced a complete failure? I really hate to have my super clean T3 ripped apart but it’s still under warranty so if this is a long term issue I guess I will proceed with the repair.

Thanks in advance.



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Ours has the same noise. It seems like it may be getting worse. I only hear it for a couple seconds on startup. We are under the emissions warranty so I haven't worried too much since if it fails it should be fully covered. But I suppose that we should try to take it in and get it diagnosed and repaired. I'm tempted to wait until we are closer to the end of the extended warranty in part because I really don't feel like fighting with the dealer. They are probably more likely to fix it without a fight the worse (noisier) it is when I bring it in.

I'll be curious to find out if others have had them fail.
 

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Discussion Starter #4
I have the extended warranty as well so may just hang tight for a bit. I’ve watched post for several years now and just don’t remember seeing many if any failures but can’t say I was specifically looking for them either which is why I posed the question.


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I'm at 175k and rattling every... or almost every start up for 2 seconds..... dealer claims he can't hear it. Wonder why?
 

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I am not certain since I bought it fixed... I just know the last oil leak fixed I was informed at 181 K I run out of warranty. I am recording video clips with sound to prove my rattle and put so.e pressure to this.
 

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You need to find out from any dealer when the fix was applied to your vehicle. Date and Milage. Demand this information as there will be a record of it which any dealer can see.
 

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I would not worry about this rattle sound at cold start, provided:
1) It is quickly disappear (after like one second)
2) It is only at cold start (after several hours rest)

Reason is simple: The tensiometer of timing chain is driven by the oil pressure. At cold start condition all oil have returned to the oil sump and oil pressure is zero in the engine circuits and in the timing chain tensiometer. It needs about one second for the oil pressure to build up then activate the tensiometer and then....no more noise.

Generally speaking , all engines do a rattle sound at cold start during first second or so , for the time the oil pressure build up and oil arrives where it is useful.
Whatever is a sound of timing chain or piston contact with cylinder or cam roller on valve lift.....The point is that IF when oil pressure builds up all noise disapear then it is OK

Also pay attention that during this second of cold start your engine is very very vulnerable since oil is nowhere.but in the oil sump. Accelrating at cold start if an engine killer. Let oil pressure build up for some seconds...
 

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Cannot edit..
Well forgot to mention. I own a V8 TDI T3. Same rattle sound at COLD start, after a night in the garage, during about one second, then nothing during all day even after short stops
 

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Read post #5 on the other thread you started and try it first. Might save you time and $$.... might.

 

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I know there are measuring blocks in VCDS on my CCTA and CBFA 2.0T engines in my Passats that you can basically "tell" how much the timing chain is stretched. Anybody aware of these for the 3.0 TDI engine?

I can't remember which blocks they are off the top of my head for Passats but will figure it out and dive into the Touareg to see if there are any similar.
 

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I believe it is measuring block 93 in the 2.0T engines & there are specs it is supposed to fall between. I believe +/- 5 degrees.

It seems these measuring blocks apply across other engines too (at least gas) as there is actually a thread on this forum about the 3.2 FSI and what values it should have.

I'm sure we can find the measuring blocks, but what values do we need to look out for.

For curiosity sake, my Touareg only has 16k miles so we could do a simple comparison of values from my vehicle to other high mileage to see if there is a difference.
 
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