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Jeep Liberty KJ and KK (2002 - 2012) Technical forum for all Jeep Liberty (also known as Cherokee in non-US markets) vehicles.

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  #16  
Old May 6th, 2017, 10:33
cushdaddy cushdaddy is offline
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Re: KJ question sorry.

Well, I figured it out. The key on the crank that drives the timing gear failed. There was about 10 degrees of rotation on the gear. That key design is stupid. There is just one little tab that engages the gear and it broke. It looks like the key is hardened. Case hardened possibly. I'm going to check it at work Monday. Nobody local has the key so the dealership won't have them till Tuesday. This makes more sense to me than 4 bad sensors. I'll update this when I get it back together. Only question is should I replace the gear?
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  #17  
Old May 7th, 2017, 08:16
trippled trippled is offline
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Re: KJ question sorry.

If the gear shows any damage or is questionable in any way then yes.
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  #18  
Old June 6th, 2017, 10:00
burntkat burntkat is offline
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Re: KJ question sorry.

Quote:
Originally Posted by cushdaddy View Post
Well, I figured it out. The key on the crank that drives the timing gear failed. There was about 10 degrees of rotation on the gear. That key design is stupid. There is just one little tab that engages the gear and it broke. It looks like the key is hardened. Case hardened possibly. I'm going to check it at work Monday. Nobody local has the key so the dealership won't have them till Tuesday. This makes more sense to me than 4 bad sensors. I'll update this when I get it back together. Only question is should I replace the gear?
I have no experience with that engine-0 but it sounds like a woodruff key. This has been used to hold crank pulleys on engines with no problems for years such as the SBC crank pulley. Works just fine.
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  #19  
Old November 17th, 2017, 11:18
WB9YZU WB9YZU is offline
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Re: KJ question sorry.

Old thread, but, I think he meant Timing Gear.

The most common time you see this failure is a failure of the cam bearings.
With the advent of using aluminum heads and cams running in the head, oil starvation can cause the aluminum in the head to seize to the cam; which breaks the key.

The Damper is also held by a key, and a huge bolt. I've not worked on an engine that wasn't this way.
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