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[polilara]

[Dave G]

Thanks for that mate!

Really appreciate your photos.
Looks like I had the right idea, but not the right photos of my own.

 

[YZ250]

You’ve probably already done it by now but this may help. It’s in the workshop manual on Section 2C:12, or page 74 on the pdf.    Did I send you a link to the workshop manual pdf?    If not, I’ll send you a link. 

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[Dave G]

Hi. No, not done it yet. Still cleaning up exhaust manifolds.
Link to the workshop manual would be brilliant. 

Thanks.

[YZ250]

Link sent. 

[Dave G]

Hi, a short update and a couple of questions, if I may.

Heads on, camshafts etc. installed, sprockets on and tensioner & idlers on. I've fitted the belt - right way round - and lined up the belt lines as accurately as I can with the the backplate and sprocket marks.

So this is a Y26SE, and the lower idler is not adjustable. The upper one was installed at 11 o'clock then moved to 9, and the tensioner is at 1.5mm above the reference mark. I've NOT turned the engine by two revolutions yet.

My concern is this: the double line mark on the belt does not align with the TDC notches on the engine and the crankshaft pulley, which is spot-on at 6 o'clock. The belt lines are a little up towards the tensioner.

So my questions are:
1. Should I be concerned about this given that everything else looks (to me anyway) to be correct? Even using the gauge on the 1/2 and 3/4 sprockets shows them bang on.
2. Does everything else look OK before I rotate the engine? In particular the 3/4 belt lines don't quite line up with the sprocket lines. If I were to move the belt to the left by one tooth, then it would be slightly out in the other direction.

A couple of pix will show where I'm at.

[Doctor Gollum]

Look at the location of the belt marks relative to the teeth...

They're never going to line up with the pulley marks which are the marks that matter.

You're wasting all that work by not using the locking/timing kit though

[Dave G]

But I did use it…!

I took it off to take the photos more clearly.

[Nick W]

My advice is simple:


the marks on the timing belt are a distraction, and aren't helpful even to position the belt initially.


Use a timing tool kit, and keep turning the engine through and adjusting the belt until all the marks on the tools line up every time.


Torque all of the relevant fasteners, and turn the engine through one more time.

[Valentin]

My advice is simple:


the marks on the timing belt are a distraction, and aren't helpful even to position the belt initially.


Use a timing tool kit, and keep turning the engine through and adjusting the belt until all the marks on the tools line up every time.


Torque all of the relevant fasteners, and turn the engine through one more time.

Agree with this advice. But the fact that white marks are located in a place that will never match the teeth, makes me think the belt is mounted the wrong way. Check the writings references if they point to the right side (clockwise). I did this mistake the first time . Or those marks are only for the pre-98 timing scheme and in this case forget what I just said before

[Enceladus]

What make and model of timing belt kit did you use?

[Dave G]

It’s a Contitech CT990 K2.
Same type Mark has used a couple of times.

[Dave G]

Just to add. Belt is definitely on the correct way round.
All marks on cam sprockets, gauge, tensioner and crank line up exactly where they should.

I’ve rotated two turns, and repeated this 3 times. As far as I can see everything looks bang on.

[Doctor Gollum]

Just to add. Belt is definitely on the correct way round.
All marks on cam sprockets, gauge, tensioner and crank line up exactly where they should.

I’ve rotated two turns, and repeated this 3 times. As far as I can see everything looks bang on.

That's about all you can do

[YZ250]

………..
My concern is this: the double line mark on the belt does not align with the TDC notches on the engine and the crankshaft pulley, which is spot-on at 6 o'clock. The belt lines are a little up towards the tensioner.
………..

I’m a little confused here, as the double line on the belt is the first point to align with the crank pulley, hence the wedge in the alignment kit to hold it there, but no matter, it’s not important, as once rotated the lines will be irrelevant anyway. The thing that is important is that there is no slack between cam 4 and the crank pulley when dealing with a fixed idler, hence the anti-clockwise suggestion.
If you’ve rotated it a few times by hand, and the binnacle gauge is still spot on with all of the cam notches when returned to TDC, then that’s a good sign.
Although obvious, another critical point is to confirm that you held the adjuster nut whilst tightening the adjuster bolt. As they go opposite directions one can potentially loosen the other when tightening.
Otherwise, you’ve done a cracking job for someone that initially felt it was a daunting task.