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'14 TDI Execline
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Did you miss the "it must be timed" part?
I've also included an extract from the manual for his exact engine "implying" that it must be timed due to the use of lock tools\pins and the setting the engine to TDC........

I don't have the exact info, but I believe that on systems with 8 injectors, they actually need to be timed to coincide with the firing events, or there would be potential for insufficient pressure........ when the same CP4.2 is used on a 6 banger, there's not enough injectors to "deplete" the rail, so it doesn't matter.... but if you look at the 4 bangers using the CP4.1, they must once again be timed.....

I'll agree that they will run even if not timed, but I suspect that they would not sustain redline rpm and\or optimal output if not timed.
 

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As above, I'm talking about timing in the traditional sense, they will run no matter how they are installed, it doesn't control the timing of the injection. That is for some nvh reason or similar.
I'll agree that they will run even if not timed, but I suspect that they would not sustain redline rpm and\or optimal output if not timed.



Yeppppp. And here we go 馃ぃ Like I said, many will argue it needs to be timed.... but by all means will run without it.
 

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09 TDi
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Having just read the factory service book regarding the belt on CATA engines I will say it is rather a complicated collection of locking pins, pretensioning and warnings about only turning pulleys in 1 direction.

while I did not see anything specific to "timing" this is not as simple as changing a drive belt and is something I would not personally under take without a way better understanding of the process and risks.
 

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2009 Touareg V6 TDI
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185 Posts
It sounds like it's not that the belt is timed, but that it can possibly damage something if either of the sprockets are rotated backwards on accident?

I tried to do some searching, and couldn't find a single instance of this belt ever failing... but I did find a few instances of the tensioner or bearings starting to make noise. I'd guess it's pretty safe to just replace it together with those parts when they start making noise.
 

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09 TDi
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I think that's a reasonable assessment and sound logic. I'll add that my concierge tech says they are a 10 year service item...keeping in mind that he gets paid to do these jobs unlike us, who pay to have them done :)
 
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