Setting cams in time VVT

[Jubs]

Hello all, great to join into this forum.

I am currently installing cams back into my a4 2.0 fsi. The VVT-technology is new to me, and now I am wondering how to install the intake cam with the cam adjuster correctly to be in time.


The cam adjuster is now in locked position, so the cam is in its most retarded position.
The intake cam's timing mark, and cam adjuster gear's timing mark are now seperated from each other. Intake cam can move clockwise, and when these marks line up, cam is in its most advanced position.

So when installing, is it correct that the adjuster is locked, and cam is in its most retarded position, and then lining cams's timing marks with cylinder head.
Or does it need to be unlocked, so the adjuster gear's mark and cam's timing mark line up, and then lining them up with cylinder head?


Don't know how clear my explanation was, but would appreciate it truly, if someone has greater knowledge to this :)
Thanks!

[canadianA4B7]

You require the cam locking tool to properly set timing.

[Miro1118]

https://youtu.be/Ob_zr9y1prE
This looked like an informative video. Gotta get the link count right and you meet to turn the intake cam to get the adjuster to seat right.

[Jubs]

Thanks for reply. I have watched that video already, but it was not telling if the adjuster is locked or unlocked..

Here is how it looks now, when adjuster is locked:



https://imgur.com/a/B4YJFYH

[A_Karl]

I am dealing with a similar issue. I have two VVT units from the 2.0. One moves freely and one is locked. I’m wondering if one is broken.

When I say move freely. I mean I can hold the camshaft by hand and spin the vvt a couple degrees. Moving the gear relative to the cam lobes.


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[Jubs]

Hi A_Karl

I had the same problem, my adjuster could move quite a lot, like 10-15 degrees. Opened up the adjuster (vvt unit) and found out that the locking pin wasn't locking at all. The pin was slipping from its hole, so i drilled a straight hole for it and now it works and locks.

[A_Karl]

Thanks for the info! Ill have to take mine apart and check it out. It probably explains the terrible start up noise.

In regards to the OP, the cam adjuster should be in locked position to set timing?

[Charles.waite]

Yea the adjuster should be locked in one position when there is no oil pressure.

[Brillo]

Thanks for reply. I have watched that video already, but it was not telling if the adjuster is locked or unlocked..

Here is how it looks now, when adjuster is locked:



https://imgur.com/a/B4YJFYH

What engine is this photo of?? 3 intake cam lobes.

[Charles.waite]

It’s got to be an NA, port injection motor since its 5V and the cams are really pointy rather than round. But, yea no idea...

[Theiceman]

Check out " that's all she wrote thread.
Adjuster is full detent until.oil pressure pushes it.

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[Jubs]

Yea the adjuster should be locked in one position when there is no oil pressure.

But do you install it in locked position and time it in that position?

What engine is this photo of?? 3 intake cam lobes.

It is from 2.0 FSI 20v ALT engine

[Charles.waite]

The cam-to-cam timing is determined by the chain and the number of links between the sprockets, and that isn’t changed by the cam adjuster. So really it shouldn’t matter unless you’re relying on the cam holder tool AND your adjuster is broken, in which case you’re going to have a bitch if a time getting it right.

If you’re replacing a chain that is already installed mark the chain and the sprockets, take the chain off, transfer (very carefully to ensure they’re correct) the marks to the new chain, then line them up with the sprockets when reinstalling.

[Theiceman]

But do you install it in locked position and time it in that position?




It is from 2.0 FSI 20v ALT engine

I don't think we can help you as that is not the same is our 2.0T fsi 16v engines


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[Charles.waite]

I’m sure it operates the same way, with the same spacing between cams and all that.

That being said that engine was never offered in the US where the majority of us are based so very few here have firsthand experience with the engine. And given how crucial it is to time these engines properly, I’d not operate on assumptions here...

[Jubs]

I don't think we can help you as that is not the same is our 2.0T fsi 16v engines

I’m sure it operates the same way, with the same spacing between cams and all that.

That being said that engine was never offered in the US where the majority of us are based so very few here have firsthand experience with the engine. And given how crucial it is to time these engines properly, I’d not operate on assumptions here...

Oh okay, so that engine is mainly seen in Europe then. Good to know.

But thank you all for your help, I will figure this out someway.

Thanks!

[Charles.waite]

Yea we only got the BPG/BPY/BWT 2.0t engines here in North America. Evidently Audi felt we couldn’t handle any less than 200hp?

This guide refers to ALT engine code, maybe it will help:

https://workshop-manuals.com/audi/a4...ain_tensioner/

In any event, good luck!

[Jubs]

Yea we only got the BPG/BPY/BWT 2.0t engines here in North America. Evidently Audi felt we couldn’t handle any less than 200hp?

This guide refers to ALT engine code, maybe it will help:

https://workshop-manuals.com/audi/a4...ain_tensioner/

In any event, good luck!

That manual has very useful information of installation. I already had that info, but thanks anyway!