Is the timing belt supposed to be a bit loose in between the camshaft pulleys? - Lexus IS Forum
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post #1 of 3 (permalink) Old 12-01-2013, 12:43 AM Thread Starter
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Is the timing belt supposed to be a bit loose in between the camshaft pulleys?

hey guys, like the title says, i was checking my belts because it was making a weird noise like the belt is broken or worn or something, i took the t belt cover off and in between the 2 cam shaft pulleys, the belt is pretty loose, i could poke it lightly and it will show looseness in the belts.. is this normal?? timing belt was replaced 10k kms ago and still looks brand new
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post #2 of 3 (permalink) Old 12-01-2013, 10:22 AM
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I replaced mine a couple years ago. You may have almost a " in deflection between both gears, but with moderate force applied using your thumb. Here is me pushing up on it using a pretty good amount of force with just my thumb, as you can see I could NOT get enough slack to where the TB could lift as high as the back plate lip and touch it. I'm sorry if this isn't an accurate answer but I would think if you can lift the belt up high enough to meet the back plate, then I think there's a tension problem. I forget if there is an indicator on the hydraulic tensioner like there is on the spring loaded serp belt tensioner. Otherwise i think you're ok.

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Last edited by jasonm4; 12-01-2013 at 11:44 AM.
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post #3 of 3 (permalink) Old 12-03-2013, 01:46 PM
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Looseness between cams will be normal as they do rotate and are not fixed to each other. And the VVTI gear is also not fixed to the intake cam, as it will adjust valve timing by changing its relation to the cam gear.

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