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-   -   Timing belt - does this look right? (http://forums.pelicanparts.com/porsche-924-944-968-technical-forum/712978-timing-belt-does-look-right.html)

PDX-944 10-23-2012 06:58 PM

Timing belt - does this look right?
 
So i am new to the t-belt thing.
in the picture, the pulley i labeled is doing nothing. i can grab it and spin it freely. is that normal? looks like this is the balance shaft belt idler pulley according to a diagram i found.
at that same point on the belt i can grab it and twist about 3/4 of the way around, im guessing thats too loose? i can search to figure out how to tighten it, thats no problem, but i just wanna make sure first.
TIA!
edit - the label should come up in a sec. its the pulley with the nut on the front just NW of the center of the pic.

http://img.photobucket.com/albums/v3...CE33B5344B.jpg

bordin34 10-23-2012 08:25 PM

There should be about a credit cards distance between the belt and that pulley.

PDX-944 10-23-2012 09:11 PM

okay perfect. what does it do? is there a certain point when it makes contact?

FransB85 10-24-2012 01:47 AM

it stops the belt from flopping too much under load changes. Balance belt should be a little loose, something like 140-180 degrees between thum and index on the long end. rotate the engine a couple of times and re-check.

Rasta Monsta 10-24-2012 07:55 AM

270 degrees is correct for b.s. belt.

PDX-944 10-24-2012 08:10 AM

good to hear! sounds like its about right then. im no pro at checking timing belts, but you can see in the pic (as well as i could see also) there was no cracking. its got 15k and 4 years on it.
safe to wait another year?

FransB85 10-24-2012 08:34 AM

Quote:

Originally Posted by Rasta Monsta (Post 7049710)
270 degrees is correct for b.s. belt.

hmm then I should loosen mine a bit maybe, doesn't whine too much though... Need to re-check tensions anyway it's been about 3000 miles since I put on the new ones

bordin34 10-24-2012 11:19 AM

I had mine at 225* and it was too loose and hitting the water pump pulley. Now its at 180* and makes noise but doesn't hit.
You also cant visibly tell the timing belt condition until it is pretty much too late. If you are having doubts, replace it.

nynor 10-24-2012 11:20 AM

Quote:

Originally Posted by PDX-944 (Post 7049749)
good to hear! sounds like its about right then. im no pro at checking timing belts, but you can see in the pic (as well as i could see also) there was no cracking. its got 15k and 4 years on it.
safe to wait another year?

how lucky do you feel? IIRC, three years or 30K miles, whichever comes first.

Gawernator 10-24-2012 12:43 PM

Four years? Replace it.

Dr944S2 10-24-2012 01:03 PM

Hi,

the video

https://www.youtube.com/watch?v=o1P0n1DXMto

should give you some answers.

Regards,

Jürgen


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