AOS DIY 997.1 C2
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Jeroen//997 (07-11-2023)
#3
Track Day
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38500 miles. I did not have clear cut signs of AOS failure, but I have a troublesome CEL and this is part of my plan of trying to solve it.
Last edited by 911ct; 12-20-2012 at 11:03 PM.
#5
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At the beggining I used an E10 socket for the intake manifold screws. When I got stuck(at the foremost screw of the intake manifold I could not fit the E10 socket) I got one of the screws and went to a Advanced Auto Parts and found a Duralast 5/16''(not metric) ratcheting wrench that was a perfect fit for the screw. That wrench saved the whole project.
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Paint2spec (03-06-2021)
#6
Drifting
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Good job 911ct and belayed thanks for this write-up... sorry I missed this earlier - looks like it came in during the x-mas holiday. Will post it on the 997 DIY sticky.
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#8
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amazing job, I heard it takes a ninja to do this if you cannot drop down gearbox.
usually AOS only gets changes when gearbox goes down due to extremely difficult access to those bolts, like you already found out.
usually AOS only gets changes when gearbox goes down due to extremely difficult access to those bolts, like you already found out.
#9
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My AOS just failed. The symptoms were a screeching on the outside of the engine on start up. I though this screech was the idler pulley bearing. I replaced it and I didn't hear the symptom for some time.
Later when I was driving, the screech appeared again consistently. I pulled the engine compartment open but by that time I had a large rush of white smoke out the exhaust. I shut it down and got a tow home.
After some investigation (turning the engine over by hand, changing oil and filter looking for debris, disassembling the intake and finding oil on all the surfaces), i was able to diagnose. The screeching was coming from the AOS.
I pulled all the parts of the top of the engine following the write-up (great write up by the way!). I had to make a special wrench to remove the intake manifold while the engine was still in the car (see pic).
I also found that even though the starter has been working great, the starter cable was a little melted. So I replaced that in the process.
When I jacked up the car, I found that I could access some of the AOS bolts from the underside by reaching past the transmission. This may help some people.
Putting it all back together tomorrow.
Later when I was driving, the screech appeared again consistently. I pulled the engine compartment open but by that time I had a large rush of white smoke out the exhaust. I shut it down and got a tow home.
After some investigation (turning the engine over by hand, changing oil and filter looking for debris, disassembling the intake and finding oil on all the surfaces), i was able to diagnose. The screeching was coming from the AOS.
I pulled all the parts of the top of the engine following the write-up (great write up by the way!). I had to make a special wrench to remove the intake manifold while the engine was still in the car (see pic).
I also found that even though the starter has been working great, the starter cable was a little melted. So I replaced that in the process.
When I jacked up the car, I found that I could access some of the AOS bolts from the underside by reaching past the transmission. This may help some people.
Putting it all back together tomorrow.
#13
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It took me about 4 hours to pull everything apart but that includes investigation time, changing the oil, jacking the car, cutting and torch bending a wrench etc. I expect 3 hrs to put it all together.