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a question out of curiousity....

just wondering what the little hole is for in the back of the tensioner?

it looks like this hole should fit over a dowel in the block or something but it does not and there is no dowel,

i have attached a pic and circled it,

 
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mikey1.

So, I'm trying to look at this from an engineering perspective...which is probably the wrong perspective, but I'm going to say...a vent hole to prevent condensate from building up and causing corrosion?

 
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OK, another thought. Maybe it's used by the OEM during the build process of the autotensioner. They use a dowel to hold that piece in place while they fit the pieces together or something.

 
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i could be wrong, but i believe i read that somewhere too, makes it easier for u to DIY.

 
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Its to pin the tensioner before installation.
Once you pull the pin it tightens the timing belt.

Edit:Just realised you werent talking about those holes.
I am not too sure.

 
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yeah that kind of makes sense

 
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Pretty sure you are talking about where the "grenade" pin goes that let's you install the tensioner and install the belt with the tensioner retracted.

 
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no not the grenade pin hole, the hole in the back of the tensioner.....i have circled it in red in the picture in my first post