2000 V70 CEL after Timing belt change

Derekw66 · Post by **Derekw66** » 10 Dec 2014, 16:17

So I just changed the waterpump and timing belt in my V70 and upon start-up my CEL came on. I verified the timing marks and only disconnected the coolant reservoir connector. The belt change was purely preventative and the car ran great before, seems a bit coincidental that the light came on right upon start-up after the changed belt. There is some slight valve clatter but nothing I would have been concerned about if the light wasn't on. Any thoughts? If it is a tooth off does anyone know how it would react? Thanks in advance guys.

Rbaratt · Post by **Rbaratt** » 10 Dec 2014, 21:49

Have you read the code. There is a code and I think it's PO014 and this code is usually associated with the pre-load on the CVVT being incorrectly set and occurs after a timing belt change. I just did my S70 and followed a procedure that had me line the timing marks up and then rotate CW an additional 1/4 turn then back CCW to the marks. This sets the preload...don't know how it does this, but I followed that procedure. Is that how you did it? After I followed that procedure I locked the cams with the cam lock tool before I removed the belt.

Rbaratt · Post by **Rbaratt** » 10 Dec 2014, 21:58

There are some procedures posted by Ozark Lee at this link.

https://www.matthewsvolvosite.com/forums ... after+belt

Derekw66 · Post by **Derekw66** » 11 Dec 2014, 06:19

Thanks for the tip there. I read his thread and it seems simple enough except the part as follows:
"Remove the timing belt from the camshaft sprockets and re-thread the belt going across the intake cam first. As you put the belt back on the exhaust cam rotate the outer flange on the CVVT hub to line up with the timing reference mark as you put the belt back on. The bolts on the CVVT hub should not be all the way to one limit or the other but they usually aren't perfectly centered either."

Am I to loosen the three bolts that hold the outer sprocket to the cvvt hub? If I rotate the engine back to the marks after preloading it, wouldn't it still be aligned? I guess it just doesn't make sense to me how the preloading is accomplished when the marks are still aligned. Plus, is the procedure still the same if I only have the cvvt on the intake only? Thanks again.

Post by **Ozark Lee** » 11 Dec 2014, 08:23

The outer sprocket on the CVVT hub moves independently from the hub itself. No need to loosen the bolts.

I'm not sure if you have a turbo or a N/A car. The CVVT is on the intake cam on a N/A and on the exhaust cam on the turbo model but the same procedure applies.

...Lee

Rbaratt · Post by **Rbaratt** » 11 Dec 2014, 10:20

Here is a link to a video that I found helpful. I never took the CVVT off my camshaft like they show in the video, but I did follow this fairly closely. If the link works you may find it helpful.

Derekw66 · Post by **Derekw66** » 11 Dec 2014, 11:01

What if I removed the belt without rotating 90 degrees forward then back again? Neither cam moved more than 1/2" between belt swapping. Do I still do the same procedure to preload or would I manually rotate just the intake forward then back? Thanks for the help. I wasn't aware of the cvvt before taking the belt off.

Post by **cn90** » 11 Dec 2014, 11:31

Very often the VVT procedure confuses people but it is very simple as Ozark Lee said.
The outer hub (where the TB makes contact with) is connected to the inner hub by splines, activated by oil pressure to advance or retard the cam.

All VVT theories aside, it is very easy to set it properly.

- Turn the crank by hand until the crank pulley mark meets the oil pump housing marking.
- Turn the crank CW another 90 degrees to tension the VVT hub.
- Then turn the crank CCW back to the mark. In the process of doing this, the tension is released on the inner VVT hub.
- If the 3 marks (crank and cam x2) are off, remove the TB and adjust it.
- Whatever you do, the mechanical tensioner tab needs to point to 12 o'clock position when all done (info in forum).
- Once all done, turn the crank by hand for 2 revolutions and check that all 3 marks line up.

Derekw66 · Post by **Derekw66** » 11 Dec 2014, 15:26

While checking and adjusting, I noticed the intake cvvt does not spring back into position. Is that normal or is it suppose to have some resistance? I can roll in roughly 30 degrees with very little effort and it stays where I put it. I rolled it forward, ensured the timing marks were in place, re-adjusted the tensioner, rolled the engine over by hand a few times then fired it up. Sounds good but I don't know if the cvvt works or not. Any thoughts?

Post by **Ozark Lee** » 11 Dec 2014, 16:40

If it isn't working it will tell you with a CEL. If you have no CEL then it is working fine. Mine have had some springlike action but not much.

...Lee