Cam Chain Tensioner? - Chicagoland Sportbikes
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post #1 of 6 (permalink) Old 06-26-2011, 02:09 AM Thread Starter
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Cam Chain Tensioner?

I have an 05 CBR600RR (~14K miles) and lately I have been hearing what I think is chain rattle when I have the engine at around 5K RPM. The CBRs are known to have issues with the automatic Cam Chain Tensioners. Anybody have any experience with this? Should I replace the CCT with another Honda part or install a manaul CCT? Also, can I adjust the automatic CCT I have so the rattle goes away?

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post #2 of 6 (permalink) Old 06-26-2011, 02:28 AM
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Stock auto cam chain tensioner is not adjustable.

Buy the stock part and pay someone experienced to put it in there correctly. There is a procedure in the manual that needs to be followed precisely or you will destroy your motor.

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post #3 of 6 (permalink) Old 06-26-2011, 08:59 AM
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like grasshopper said, have a professional do it. if you try to do it yourself and miss the smallest detail it can lead to severe top end damage. id have a professional diagnose the problem before you assume that is the issue though, could be a number of things
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post #4 of 6 (permalink) Old 06-26-2011, 09:20 AM
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Quote:
Originally Posted by AgentofDarkness View Post
I have an 05 CBR600RR (~14K miles) and lately I have been hearing what I think is chain rattle when I have the engine at around 5K RPM. The CBRs are known to have issues with the automatic Cam Chain Tensioners. Anybody have any experience with this? Should I replace the CCT with another Honda part or install a manaul CCT? Also, can I adjust the automatic CCT I have so the rattle goes away?
If you know it's the CCT and you're going to replace it. I'd go with a APE manual. http://ape-store.com/shopsite/page4.html

You might have a stretched chain too, so I'd look at replacing that while you're at it.

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post #5 of 6 (permalink) Old 06-26-2011, 10:47 AM
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Personal experience during the development of a inverted tooth chain drive 12K rpm system over the last two years, they are very sensitive to tensioner damping / back lash / spring rate. If you think the tensioner is bad, replace it with a OEM part.

A fixed tensioner dramatically increases the stiffness of the chain system. The only damping remaining is in the guides, and chain stretching within the elastic region of the material. This will raise any natural frequencies in the system up higher, but also increase the magnitude of the stresses. If not adjusted to keep up with the chain wear, the system now becomes very soft (loss of guide contact), and chain slapping or impact loads become a problem.

The tensioner is probably a ratcheting steel plunger in a steel body, with a calibrated orifice for damping. Not much of anything to wear out, except the ratchet mechanism. More likely its a stretched (0.5 - 0.8%) chain or worn chain guides. Although the guides would probably NOT cause a rattle.

As Grasshopper said, start with an experienced mechanic to install the tensioner. If that doesn't work, measure the stretch of the chain (typically a spec over 10 links), as OldSkool said. Rattle doesn't always indicate a durability problem with chain drives, it just might indicate a looser than nominal system (lower natural frequency) getting closer to a valvetrain or crank resonance.
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post #6 of 6 (permalink) Old 06-26-2011, 12:14 PM

 
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Don't just throw parts at it. Get it fixed right. It could be a cam chain tensioner, is could be a valve, it could be the exhaust. Lots of things make noise. Just because it's a Honda doesn't mean it the CCT.

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