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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Thu Mar 08, 2012 11:30 pm 
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i always white dot the timing marks before taking anything off.... turn the engine over by hand acouple of revolutions when its reassembled.....the dots are easier to see when its back to the starting position....

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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Thu Mar 08, 2012 11:34 pm 
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dirty hands wrote:
i always white dot the timing marks before taking anything off.... turn the engine over by hand acouple of revolutions when its reassembled.....the dots are easier to see when its back to the starting position....

Yes I use TIPEC to mark them with :lol:

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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Fri Mar 09, 2012 1:31 pm 
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awesome link, i cant believe how expensive the flywheel lock is from porsceshop.

Image

but at least i know where i can get one. Its the tool for the job though, fits into the same bolt holes as the starter ahh i see.
And the teeth lock the flywheel. Simple effective but £70!! :shock:

I stripped my S down some more and have felt the tensions on the timing belt and balance belt. I had hoped the balance belt
was going to be on the tight side, but as previous, I can freely spin the idler with the belt just resting on it.


The timing belt i checked by this rule of thumb.

Image

At the bottom of the water pump belt shield, i can just touch it with the belt.



Image

At the top i cannot, its too taught to deflect this much.


My belts are pefectly tensioned going by these rules of touch and feel. But i have the classic whine sound. Which might be idler bearing noise instead?

Heres my S running have a listen.

http://www.youtube.com/watch?v=VFCXH3Ya5wU


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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Fri Mar 09, 2012 2:41 pm 
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That sounds exactly like mine, which has new belts on. However, I didn't do the change, I have to hope the garage I bought it from did it well.

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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Fri Mar 09, 2012 4:48 pm 
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http://www.porscheshop.co.uk/acatalog/p ... html#a5186

Thanks for the link Alex

Ive commited myself to pulling the belts so ive bought this tool. I shall set the engine to TDC going by these timing marks, which i havnt yet found on my S. Good idea with the tip ex, once im at TDC ill put a spot on the flywheel.


Image


Image


Image


Then release tension, pull the belts and get the pump off. I wonder if the pump could be making the whine?


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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Fri Mar 09, 2012 11:17 pm 
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I bought my 944 and 968 flywheel locks from OPC Exeter both were a lot cheaper than Porsche shop at the time.

Rich


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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Sat Mar 10, 2012 6:12 pm 
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Joined: Tue Mar 06, 2012 11:30 pm
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Image

S enjoying the dismanterling process. In this case cut the cable ties and most of the front came apart.




Image






Image

This is where im at with the starter out and the belts exposed, now I need some advice

Whats supposed to be here, this hose became visable when i removed the airbox, one end went into the box itself but the
end with the clip? looks like there should be something attached to it? i cant see anything obvious anyone anyone?



Image

The casing, should this part come off without having to pull the pulley? Advice please.

I see someone has already touched it up with tip ex handy! Not many 924's with a spring tensioner 8)


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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Sat Mar 10, 2012 8:52 pm 
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You will have to remove the alternator belt, then the cover will come off. Not sure what those pipes go to, its been a while since i saw a 2.5 na.
It may be the angle of the bottom photo but the idler pulley for the balance belt actually looks like its putting the belt under tension, that would certainly make it whine.

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 Post subject: Re: Balance belt timing belt 924S 1988
PostPosted: Sat Mar 10, 2012 9:09 pm 
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Thanks dude, will get the drive belt off, that pulley does look like its tensioning against the belt at that angle, but thats the one i checked i could spin freely, i will check it again though thanks.


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