3.0 TDI - timing chain condition
AudiWorld Super User
Joined: Jan 2021
Posts: 4,565
Likes: 1,456
From: USA - NM
Have you tried searching with key words: VCDS timing chain stretch
All you are really looking for is the camshaft bank 1 phase position, with engine running and already at normal operating temperature, etc., so you can go pull that up in the advanced measurement 'button' from your engine module.
The Gen 1 TDI 3.0 is a fairly rock-solid motor, and many of them can go 200 - 300k miles, if you keep the oil changed, before needing a new timing chain set. That said, it does have multiple timing chains & tensioners, and is relatively complex setup, etc. Oil dilution in North America market related to lower quality diesel fuel combined with the extended, standard oil change intervals negatively impact timing chain longevity, as well as the hydraulic chain tensioner's functionality.
The Gen 2 TDI 3.0 is completely revised engine design/construction, and this is lighter and has fewer timing chains, and a lot more plastic components on the motor, which makes it more likely to encounter issues as it ages, but not necessarily from timing chains. Same issues from combo of lower fuel quality and extended oil change intervals resulting in oil dilution, and deposits, which negatively impacts hydraulic tensioners, turbos, main bearings, etc., etc.
Use better fuel, use diesel additives, and change your TDI's oil based on how you actually drive it rather than Audi's once-size-fits-all 10k miles OCI reminder. You can very easily modify the OCI and service inspection intervals / reminders in VCDS or using OBD-eleven, etc.
All you are really looking for is the camshaft bank 1 phase position, with engine running and already at normal operating temperature, etc., so you can go pull that up in the advanced measurement 'button' from your engine module.
The Gen 1 TDI 3.0 is a fairly rock-solid motor, and many of them can go 200 - 300k miles, if you keep the oil changed, before needing a new timing chain set. That said, it does have multiple timing chains & tensioners, and is relatively complex setup, etc. Oil dilution in North America market related to lower quality diesel fuel combined with the extended, standard oil change intervals negatively impact timing chain longevity, as well as the hydraulic chain tensioner's functionality.
The Gen 2 TDI 3.0 is completely revised engine design/construction, and this is lighter and has fewer timing chains, and a lot more plastic components on the motor, which makes it more likely to encounter issues as it ages, but not necessarily from timing chains. Same issues from combo of lower fuel quality and extended oil change intervals resulting in oil dilution, and deposits, which negatively impacts hydraulic tensioners, turbos, main bearings, etc., etc.
Use better fuel, use diesel additives, and change your TDI's oil based on how you actually drive it rather than Audi's once-size-fits-all 10k miles OCI reminder. You can very easily modify the OCI and service inspection intervals / reminders in VCDS or using OBD-eleven, etc.
Last edited by '10Q7TDI_Prestige'; Jul 19, 2025 at 04:37 PM.
Thread Starter
AudiWorld Senior Member
Joined: Jan 2010
Posts: 1,674
Likes: 17
From: Brighton, MI
I found this (below), but the range seem to be way to big to be used for chain stretch: I took a look through the B8 repair manual docs we have from our last erWin Audi subscription (so this is generalizing all of the A4, A5 and Q5 engines) but they all appear to show 11:
• Permissible deviation < -11.01° CRK
• Or
• Permissible deviation > 11.01° CRK
• Permissible deviation < -11.01° CRK
• Or
• Permissible deviation > 11.01° CRK
AudiWorld Senior Member
Joined: Mar 2017
Posts: 1,616
Likes: 517
From: Fairbanks, Alaska
There was another thread on AudiWorld that referred to another forum's discussion regarding timing and chain stretch. Here is that link. I also sent you a PM with some added information, in the event it helps.
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