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I edited my question because I had asked the wrong question. I know how to take up the slackness of belt by rotating the engine by hand and adjusting the belt tensioner bolt. This is not what I want to know here. I have learnt them in my previous question thanks to my friend HandyHowie.

What I need to know here is the very stage of just putting the belt on the pulleys and sprockets correctly. Do you pull the belt a little bit by hand to install it straight and level between the pulleys and prevent to shape it like a curved line?

enter image description here

This is what I need to know:

**When sliding on the new belt, keep the slack near the tension pulley — all other belt running should be tight. This will help keep proper alignment as the tensioner pulley is tightened. **

Source: https://shop.advanceautoparts.com/r/car-projects/how-to-change-a-timing-belt

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    I went through this with you in your previous question, what didn’t you understand? mechanics.stackexchange.com/questions/82921/…
    – HandyHowie
    May 26 at 19:30
  • I hope you haven’t done this on your engine. If you have, your belt is likely to slip.
    – HandyHowie
    May 26 at 19:32
  • @handyhowie I understood what you told me at that topic. It was regarding the tensioner not the belt. I thought it is better to create another topic which focuses in belt tension before tightening the tensioner bolt. No, I haven't done anything on my engine yet. Don't worry. May 26 at 20:02
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    If you are still not sure how to tension the belt, please do ask more specific questions. Do not try to change the belt unless you are absolutely certain about what you are doing. However, if you follow the instructions from the manual that you posted in your previous question, to the letter, you should have no problems.
    – HandyHowie
    May 26 at 20:10
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    The pulleys for the crank and cam need to stay in the correct relative angular position. For example, if there are supposed to be 20 free belt teeth between the cam pulley and the crank pulley, then if you put the belt on loose like in your curved green line so that there are 21 belt teeth between the 2 pulleys. When you tension the belt, one of the pulleys will move out of the correct alignment, it will be at an incorrect angle compared to the other pulley.
    – HandyHowie
    May 27 at 22:07
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No, your way is not the correct way of doing this.

It's very simple. Once the belt is installed, rotate the engine in the proper rotation (most are clockwise) from the crankshaft for two turns. This puts all the slack on the tensioner side. This also gives you another chance to double check the timing without the engine going crunch.

The very best way to know you are doing it right is to follow the repair manual. While what I've stated is true of most engines with timing belts, it won't be true for ALL engines with timing belts.

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  • Thanks for your answer. I'm completely aware of engine rotation procedure. Here, I'm talking about whatever should be done before engine rotation. You said once the belt is installed ....... I'm exactly talking about this stage. How do you install the belt on the car properly? There must be a certain number of belt teeth between each pulley. For example, if there are 15 teeth of space between fuel and exhaust pulleys, you have to install the belt that way. If you install it in a way that there are 14 teeth between the pulleys, it will be loose and slack. May 26 at 20:16
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    @NarimanAsgharian - No, that's not what your question asked. It asked if your procedure is correct for taking up the slack in the belt, and it's not. You take up the slack in the belt by rotating the engine. Before that, you need to get the belt onto the cogs correctly, so the engine stays in time. As long as the engine is in time, there's no issue. May 26 at 20:25
  • I think I have problem communicating what I mean. How should I get the belt on the cogs correctly? By pulling the belt by hand and choosing the longest and the most straight path between each pulley or the other way? May 26 at 20:28
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    Usually by starting at the crankshaft and going the opposite of engine rotation, in most cases counterclockwise. This makes the belt tight on the proper side. Yes, the slack remains on the tensioner side. You can never get all of the slack out of it, which is why you rotate the engine before setting the tensioner. May 26 at 20:31
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    I added a picture to my question. The correct way of putting the belt between the pulleys is to choose the most straight path with the shortest number of teeth between them (like the blue line I have specified in the picture). It is also possible to choose a curved path and put the belt like the green line like in the picture with the higher number of teeth between the pulleys. So, to prevent this, you have pull the belt a little bit by hand to install it straightly. May 26 at 20:51

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