cvvt preload

[mrscullini]

2000 v70xc

When I removed the cams I lost the setting on the exhaust cam. I am now reassembling after and need to adjust the preload for the cvvt. Can i simply preload the exhaust cam and install the solenoid? Will the sprocket it hold the position after the solenoid is bolted down and sealed?

Lee, in one of my previous post you referenced this in a reply, but i could not find the details. You had a link to your engine swap thread and it looks like you had to finally breakdown and by the cam tool.

[Ozark Lee]

I've been waiting for this, I knew it was coming.

You can install the CVVT solenoid at any time, it makes no difference in the timing since it works off of oil pressure and you obviously don't have any oil pressure with an engine that isn't running.

What did you remove or loosen on the exhaust cam CVVT assembly? There are two different procedures but I need to know if the CVVT unit (the inner hub with the T-55 Tox cap) or the Pulley (the outer part of the CVVT assembly with the teeth for the timing belt) was ever removed or loosened to point you to the correct procedure.

...Lee

[mrscullini]

I've been waiting for this, I knew it was coming.

You can install the CVVT solenoid at any time, it makes no difference in the timing since it works off of oil pressure and you obviously don't have any oil pressure with an engine that isn't running.

What did you remove or loosen on the exhaust cam CVVT assembly? There are two different procedures but I need to know if the CVVT unit (the inner hub with the T-55 Tox cap) or the Pulley (the outer part of the CVVT assembly with the teeth for the timing belt) was ever removed or loosened to point you to the correct procedure.

...Lee

thanks lee. i did not remove anything from the cams, no sprocket, no torx bolt, nada.

[Ozark Lee]

If nothing was loosened then you should be able to treat this like a timing belt change. Mine was quite a bit deeper in the woods than that since I lost all reference.

I think this is how it works:

With the crankshaft and camshafts all set on the timing marks install the timing belt and tension it.

Rotate the crankshaft clockwise by hand a couple of revolutions and recheck the marks. If they line up, rotate the the crankshaft an additional 90 degrees clockwise and then back counterclockwise to the marks. Remove the belt from the pulleys and then tweak the exhaust pulley back to the timing mark while re-installing the belt. Set the tension on the tensioner to spec (depending on the ambient temperature) and you should be good to go.

Hopefully Matty Moo will comment, he went through the same timing belt change and pre-load procedure last week.

...Lee

[mrscullini]

If nothing was loosened then you should be able to treat this like a timing belt change. Mine was quite a bit deeper in the woods than that since I lost all reference.

I think this is how it works:

With the crankshaft and camshafts all set on the timing marks install the timing belt and tension it.

Rotate the crankshaft clockwise by hand a couple of revolutions and recheck the marks. If they line up, rotate the the crankshaft an additional 90 degrees clockwise and then back counterclockwise to the marks. Remove the belt from the pulleys and then tweak the exhaust pulley back to the timing mark while re-installing the belt. Set the tension on the tensioner to spec (depending on the ambient temperature) and you should be good to go.

Hopefully Matty Moo will comment, he went through the same timing belt change and pre-load procedure last week.

...Lee

got it. thanks lee, you and the others have been awesome. i'll update tomorrow, stay tuned....

[Maestrours]

I think this is how it works:

With the crankshaft and camshafts all set on the timing marks install the timing belt and tension it.

Rotate the crankshaft clockwise by hand a couple of revolutions and recheck the marks. If they line up, rotate the the crankshaft an additional 90 degrees clockwise and then back counterclockwise to the marks. Remove the belt from the pulleys and then tweak the exhaust pulley back to the timing mark while re-installing the belt. Set the tension on the tensioner to spec (depending on the ambient temperature) and you should be good to go.

Hello,

I exhume this post too ;
I'm having a PITA to Time correctly my VVT well as VIDA says 15° on shifting angle.
But in the post I quote, i do not understand the procédure: if camshafts and crankshafts are aligned well with the timing marks before putting the belt, why should we " tweak the exhaust pulley black to the timing mark" After some rotations? How Can it be shifted if the timing belt is on?

I Guess this ununderstanding is the Key for me to Time my belt correctly.
Thks !!

[wizechatmgr]

I think this is how it works:

With the crankshaft and camshafts all set on the timing marks install the timing belt and tension it.

Rotate the crankshaft clockwise by hand a couple of revolutions and recheck the marks. If they line up, rotate the the crankshaft an additional 90 degrees clockwise and then back counterclockwise to the marks. Remove the belt from the pulleys and then tweak the exhaust pulley back to the timing mark while re-installing the belt. Set the tension on the tensioner to spec (depending on the ambient temperature) and you should be good to go.

Hello,

I exhume this post too ;
I'm having a PITA to Time correctly my VVT well as VIDA says 15° on shifting angle.
But in the post I quote, i do not understand the procédure: if camshafts and crankshafts are aligned well with the timing marks before putting the belt, why should we " tweak the exhaust pulley black to the timing mark" After some rotations? How Can it be shifted if the timing belt is on?

I Guess this ununderstanding is the Key for me to Time my belt correctly.
Thks !!

Because it's essentially hydraulic - it is not fixed in the timing to the cam sprocket.

[rrres]

I think this is how it works:

With the crankshaft and camshafts all set on the timing marks install the timing belt and tension it.

Rotate the crankshaft clockwise by hand a couple of revolutions and recheck the marks. If they line up, rotate the the crankshaft an additional 90 degrees clockwise and then back counterclockwise to the marks. Remove the belt from the pulleys and then tweak the exhaust pulley back to the timing mark while re-installing the belt. Set the tension on the tensioner to spec (depending on the ambient temperature) and you should be good to go.

Hello,

I exhume this post too ;
I'm having a PITA to Time correctly my VVT well as VIDA says 15° on shifting angle.
But in the post I quote, i do not understand the procédure: if camshafts and crankshafts are aligned well with the timing marks before putting the belt, why should we " tweak the exhaust pulley black to the timing mark" After some rotations? How Can it be shifted if the timing belt is on?

I Guess this ununderstanding is the Key for me to Time my belt correctly.
Thks !!

Just went through this procedure for the first time in my exhaust-only vvt car. The important thing is that the notches at the rear of the camshafts are in their proper positions and then locked. With the cams locked and the timing belt off, the vvt hub can still rotate, independent of the camshaft. Cams still locked and crank pulley mark aligned, I rotated the vvt to align the timing mark, then installed the belt. Assuming you didn't loosen or remove any of the sprocket bolts.

[Maestrours]

Thank you. If I dont have the Volvo cam locking tool, it is impossible to do it correctly? How do I preload the vvt?

[Maestrours]

So I ordered a locking tool as I just can't understand how this works.
I loosened sprocket bolts previously, to try a better setting as it had a rough idle. It worked, but does it ruins the vvt settings, and how do I set it correctly if just loosening the 3 bolts (not the center one) did some mess?
Notches aligned and timing marks aligned, how do I set the vvt Hub, as it rotates independantly from the pulley?
That's the part I don't get.. thanks