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Chain noise
Lately, my engine developed a distinct chain noise at high mid to high rpms. It is especially frustrating since I rebuilt it with upgraded chain idler arms and pressure fed tensioners only two years ago. So, I did a partial engine drop for valve adjustment, and removed my chain covers to investigate. The passenger side was nice and tight. But on the driver side, I found the chain not as tight, could lift it about 10 mm from the ramp. And also, the idler arm can move back and forth on its axis by at least 1mm. Questions: 1. How can I tell for sure if my tensioner is bad? 2. Is the back and forth play on the idler arm axis normal or not?
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OK I did a little search, and the play on the idler arm is normal. We are only left with a possibly bad tensioner. I noticed it is less extended than on the other side.
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Check to make sure the nipple didn't come detached.
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Quote:
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I removed the tensioner, and I can compress it fully by hand! I really think it is toast. My plan is to revert back to my old setup with safety collars. I still have the old chain covers and the old tensioners, which are very strong. No way I could compress those by hand.
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It may not be toast, compare it to the resistance from the other tensioner. The running resistance is greater as they have the pressure from the oil.
I believe that you can disassemble and repair it as well, I haven't had one apart in a while. This would be a good time to bullet proof them by doing the "Jerry Woods Mod". Quoted below for your convenience; Quote:
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Here is a link to the thread:
http://forums.pelicanparts.com/porsche-911-technical-forum/199819-shops-dont-recommend-carrera-tensioner-update.html |
Thanks Shane, I was just looking at this thread. In fact, I already dismantled my tensioner, and unlike the old style tensioners, there are no o-rings that can fail. The only part that could fail is the spring, and mine looks fine. So, my new plan is to refresh them by adding grease on the piston, and do the Jerry wood modification for peace of mind. Then, if the chain noise is stil there, I have bigger problems...
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