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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Sun Aug 18, 2013 1:04 pm Post subject: How to set the timing and balance shaft belts on a 924S/944 |
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Ok, I didn't know what to call this thread, but this is not a "how to install, or tension the belts". This is only how to get the timing marks to line up flawlessly with very little effort... I've seen guys trying to rock the crank back and forth, or even try and stretch the belt over the sprockets in hopes they could get it to line up.
Anyway, I've been meaning to do this thread for a long time and I hope that it will save people alot of time and effort. I can change these belts in about 10 minutes with these procedures and they work great, enjoy!
Also, before rotating the cam, you must make sure the crank is at TDC. Don't worry about rotating the cam this tiny bit, this is how professionals install belts.
If you follow these steps you will have no problems, but I'm not liable if you mess up. As mentioned, these instructions do not include how to tension the belts, but you can find hundreds of write ups across the web that cover that.
Part One:
The timing belt...
_________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver
Last edited by edredas on Sun Aug 18, 2013 1:21 pm; edited 1 time in total |
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edredas
Joined: 09 Dec 2004 Posts: 861 Location: Charlotte, NC
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Posted: Sun Aug 18, 2013 1:04 pm Post subject: |
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Part Two:
The balance shafts!
The timing marks are on the back of the sprocket and plastic belt cover.
Below I have the upper shaft set to -10 degrees or ~1 tooth CCW.
Here's a better look at the timing marks. Notice the line on the face points to the notch on the back of the sprocket. Do not use the "0".
The lower balance shaft timing mark is also on the belt cover, and is just visible below.
Make sure you have the belt installed around the lower BS and tensioner, then lift up on the belt to pull all the slack to the top area and hold it as you perform step 3.
In this photo you can kinda see how the slack has been moved to the lower right side of the shaft.
Here you can see the lower balance shaft and the slack coming off the crank.
Don't be too upset if you can't get step 5 to work, just turn the lower balance shaft and you're ready to set the tension. _________________ '84 944 -White, Brown interior
'84 944 -Red, Automatic
'86 944 -Garnet, Fully loaded, Koni suspension
'87 924S -Red, 300hp 951 swap
'87 924S -Red, Project Car
'88 924S -Red, Daily Driver
Last edited by edredas on Fri Oct 04, 2013 5:17 am; edited 5 times in total |
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peterld
Joined: 10 Dec 2006 Posts: 947 Location: Noosa Heads QLD Australia
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Posted: Sun Aug 18, 2013 10:17 pm Post subject: |
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Great write-up red ass Ed! Thank you. _________________ 80/81 932/8 ROW |
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PhoenixOO10
Joined: 10 Jul 2009 Posts: 12 Location: Portage, IN
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Posted: Mon Aug 19, 2013 4:48 pm Post subject: |
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This is great! As someone that is not a very experienced mechanic, i can not thank you enough for this. Bravo, good sir, bravo. _________________ 1988 924S - everyday driver. |
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hdrider19
Joined: 03 May 2016 Posts: 193 Location: Catawissa Missouri(40 mi sw of St Louis)
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Posted: Sun Mar 19, 2017 3:51 am Post subject: |
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Now you have me thinking I should pull the covers off and reset my belts before 1st startup. Another great tip. _________________ 87 924S |
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