[WolverineFW]

I would like to see some actual data on wear from a used belt vs. a new one.

There are a couple 3.0 TDI's in Canada that have gone over 500,000 kms and afaik, they never changed that belt.

Obviously different environments and usage can affect something like this.

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[SaVAGeSoot]

I'm not even sure the belt would be the root cause of a failure. The idler/tensioner is more likely to crap out no?

 

[Brendanm]

I would like to see some actual data on wear from a used belt vs. a new one.

There are a couple 3.0 TDI's in Canada that have gone over 500,000 kms and afaik, they never changed that belt.

Obviously different environments and usage can affect something like this.

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You can't see the wear on a toothed belt, they are working one minute, have no teeth the next minute.

 

[rgh0]

Yes I agree the tensioner bearing is probably going to fail first. The tooth belt is relatively lightly loaded and runs at a relatively low speed compared to cam timing belts. My guess is that a 150k to 200k km replacement of belt and tensioner is reasonable preventitive maintenance. If the belt fails you will get no warning and the car should just stop due to lack of fuel from the HPFP not great if your in Australia and in the middle of nowhere. If the bearing goes out then you will get a warning as it starts to whine well before it will fail totally.

 

[WolverineFW]

You can't see the wear on a toothed belt, they are working one minute, have no teeth the next minute.

You could put a caliper on a new belt and measure the difference on the worn belt, if didn’t loose its teeth. Not sure if they make a gauge for measuring. Gates makes a gauge for their serpentine belts.


Not to mention they can develop cracks before they break....well if they are EPDM this is not the case.

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[Malaudi]

FWIW I have a 2004 Audi A6 with a BMK engine. (3.0 L TDI). The recommended change interval is 120K Km (80K miles) and the tensioner every 240K Km.

 

[Brendanm]

You could put a caliper on a new belt and measure the difference on the worn belt, if didn’t loose its teeth. Not sure if they make a gauge for measuring. Gates makes a gauge for their serpentine belts.


Not to mention they can develop cracks before they break....well if they are EPDM this is not the case.

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That's not how toothed belts work. Cracks or not on the outside tell you diddly squat about what's happening on the inside of the belt, or whether the teeth are about to fall off.

 

[rgh0]

FWIW I have a 2004 Audi A6 with a BMK engine. (3.0 L TDI). The recommended change interval is 120K Km (80K miles) and the tensioner every 240K Km.

I wonder why Audi have a recommended HPFP belt and tensioner change interval but VW dont ? Just something they missed maybe. Given the difficulty on doing it on the V8 I think i will do belt and tensioner at 120k km which will come up in about 12 to 18 months

 

[tozork]

Replaced, make marks and count teeth.. Make sure you adjust the tension on the tensioner correctly..
With nearly 200k on the original it was time to have some more piece of mind.
Make sure you do the hardware pullies and all.
No sense in being cheap over parts that have gone 12yr and 200k miles in my opinion.

 

[Brendanm]

Replaced, make marks and count teeth.. Make sure you adjust the tension on the tensioner correctly..
With nearly 200k on the original it was time to have some more piece of mind.
Make sure you do the hardware pullies and all.
No sense in being cheap over parts that have gone 12yr and 200k miles in my opinion.

You don't need to make marks or count teeth, the high pressure fuel pump is not timed.

 

[volkswagens-for-life]

You don't need to make marks or count teeth, the high pressure fuel pump is not timed.

That's debatable depending whom you ask lol

 

[Brendanm]

That's debatable depending whom you ask lol

Unfortunately for anyone who thinks they are timed, they are incorrect.

 

[volkswagens-for-life]

Unfortunately for anyone who thinks they are timed, they are incorrect.

I've heard some pretty convincing arguments either way. I wish I remember who it was arguing it.. it was somebody big in the field. I know you can't install a pump 180* out like the old days but I saw pretty convincing engineering discussion that to a point they are indeed timed. Dunno my guy. I'm neutral on this one but can accept that these pumps can basically be installed however

 

[Brendanm]

I've heard some pretty convincing arguments either way. I wish I remember who it was arguing it.. it was somebody big in the field. I know you can't install a pump 180* out like the old days but I saw pretty convincing engineering discussion that to a point they are indeed timed. Dunno my guy. I'm neutral on this one but can accept that these pumps can basically be installed however

I'm not suggesting. They are not timed. They have nothing to do with timing, they simply make pressure, the ecu controls when the injectors are fired.

 

[volkswagens-for-life]

I'm not suggesting. They are not timed. They have nothing to do with timing, they simply make pressure, the ecu controls when the injectors are fired.

Maybe, but its a just a regular old cp4.2 which every big diesel uses, and on every other big diesel they need timed....

 

[Brendanm]

Maybe, but its a just a regular old cp4.2 which every big diesel uses, and on every other big diesel they need timed....

No common rail pump needs to be timed. On anything at all. Ever.

 

[volkswagens-for-life]

No common rail pump needs to be timed. On anything at all. Ever.

I'm not saying you're wrong, but there's countless sources that disagree

2011-2014 Post-Warranty Power Stroke Fix Part 2: Turbo & CP4.2 Install

With the right air and fuel added to an early 6.7L Power Stroke you can have a 640hp tow monster!

www.drivingline.com

Here's the timing procedure for the eco diesel ram

https://www.ram1500diesel.com/attachments/3-0-ecodiesel-injector-pump-install-pdf.91773/

 

[Brendanm]

I'm not saying you're wrong, but there's countless sources that disagree

2011-2014 Post-Warranty Power Stroke Fix Part 2: Turbo & CP4.2 Install

With the right air and fuel added to an early 6.7L Power Stroke you can have a 640hp tow monster!

www.drivingline.com

Here's the timing procedure for the eco diesel ram

https://www.ram1500diesel.com/attachments/3-0-ecodiesel-injector-pump-install-pdf.91773/

Probably a nvh thing for weird American products. You could put it on "incorrectly" and it's still going to run.

 

[volkswagens-for-life]

Probably a nvh thing for weird American products. You could put it on "incorrectly" and it's still going to run.

I absolutely will not deny the weird American products thing. And that's what I'm saying I totally believe you could put it on wrong and it runs but I think when you get deep into the technical nitty-gritty stuff that there is a technical timing process. I know it's not like an old rotary pump or something where if you put it 180° out it won't run or it will run like crap etc

 

[SaVAGeSoot]

No common rail pump needs to be timed. On anything at all. Ever.

🧐