Tofu4679

I'm getting ready to put the belt back on and the steps from Bentley are:

all w/cam locking bar and crank pin installed
1) Loosen cam sprockets
2) Tighten cam bolts hand tight still allowing cam sprockets to spin.
3) Put the belt on, not really worrying about proper teeth, tension, etc.
4) Pull pin on tensioner (maybe wait a few minutes for it to extend fully
5) Pre-tension belt at 15Nm

First question is just to triple check that when pre-tensioning I'm ADDING more tension to the belt, to the tune of 15Nm.
Second, since the cam sprockets are able to spin freely, when the belt is pre-tensioned (with cam locking bar on) they will move into the correct position (i.e. in time) so that when the cams are tightened down (still maintaining 15Nm of tension) everything will be in perfect time?

It may seem elementary but if I want to make sure I really really understand.

HdiaS4

I'm getting ready to put the belt back on and the steps from Bentley are:

all w/cam locking bar and crank pin installed
1) Loosen cam sprockets
2) Tighten cam bolts hand tight still allowing cam sprockets to spin.
3) Put the belt on, not really worrying about proper teeth, tension, etc.
4) Pull pin on tensioner (maybe wait a few minutes for it to extend fully
5) Pre-tension belt at 15Nm(this means on the tensioner pulley put some tension so the tensioner pulls on the arm on the right way)

First question is just to triple check that when pre-tensioning I'm ADDING more tension to the belt, to the tune of 15Nm.
READ MY COMMENT ON #5

Second, since the cam sprockets are able to spin freely, when the belt is pre-tensioned (with cam locking bar on) they will move into the correct position (i.e. in time)NO
The timing has to be right before everything is removed, pin lock in and cam bar on.
By pretensioning the belt with the sprockets loose you will get rid of the extra slack on the belt, for ex btw the sprockets and all the extra slack will go to the tensioner.


so that when the cams are tightened down (still maintaining 15Nm of tension) everything will be in perfect time?
After you pull the pin on the tensioner the belt will be tight. than you torquing the cams bolts to make sure they hold the sprocket since at this point they are loose.


got it?

Tofu4679

"5) Pre-tension belt at 15Nm(this means on the tensioner pulley put some tension so the tensioner pulls on the arm on the right way)"

I wanted to clarify the "direction" I'm adding the 15Nm. I assume that means to tighten the belt 15Nm more, or does it mean to put the 15Nm against the tensioner moving the piston back in slightly?

HdiaS4

<center><img src="http://pictureposter.audiworld.com/69642/tb.jpg"></center><p>
the big circle is the timing belt tensioner.
the small circle is where you put the 8mm allen to tighten the belt. that is where you have to apply the 15nm to tighen the belt so it moves in the direction of the big arrow.
To tighten the belt put the allen socket in the hole and rotate it counter-clockwise like the small arrow.

good?

Tofu4679

Perfect thanks, for your help.

sidespar

The Bentley has a picture of which way you should be turning the tensioner. It should get tighter.