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  #1  
Old 03-02-2015, 11:09 AM
scubacamper scubacamper is offline
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Default Possible effects of a broken timing chain guide

2004 Quest SL - 200,000 miles

I had lots of ticking coming from the motor in the area of the timing chain.

I replaced the timing chain tensioner which alleviated the problem for a little while, but now that sound is back.

I'm beginning to think the timing chain guides have broken.

What are some possible negative effects of having the guides broken?

Thanks!
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  #2  
Old 03-02-2015, 04:36 PM
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mpe235 mpe235 is offline
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The timing chain can become loose and jump teeth on the gears. could potentially damage the engine.
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  #3  
Old 03-02-2015, 05:36 PM
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smj999smj smj999smj is offline
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I haven't heard of any issues of timing guides "breaking" on VQ engines. On the 3.5's and 4.0's, there have been problems with the upper chains cutting into the upper tensioner's plastic "faces" or "feet" (the part that sits on the end of the tensioner plunger and contacts the chain), but this issue creates a loud "whine" type noise, not a ticking. I wonder if you could have a bad accessory drive bearing or idler bearing at the front of the engine? It might be worth removing the serpentine belt and running the engine to see if the noise is still present.
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  #4  
Old 03-03-2015, 04:40 AM
scubacamper scubacamper is offline
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I wonder if this issue could have anything to do with my other issue: Camshaft Sensor Issues with stalling
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Old 03-03-2015, 03:09 PM
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mpe235 mpe235 is offline
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Quote:
Originally Posted by smj999smj View Post
I haven't heard of any issues of timing guides "breaking" on VQ engines. On the 3.5's and 4.0's, there have been problems with the upper chains cutting into the upper tensioner's plastic "faces" or "feet" (the part that sits on the end of the tensioner plunger and contacts the chain), but this issue creates a loud "whine" type noise, not a ticking. I wonder if you could have a bad accessory drive bearing or idler bearing at the front of the engine? It might be worth removing the serpentine belt and running the engine to see if the noise is still present.
The guide on the tensioner side of the main timing chain breaks and drops. That causes the tensioner to fully extend and leaves slack in the chain. It is very common on the 3.5L. You can verify it by taking the black cover over the tensioner off. You should be able to see the tensioner fully extended.
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Old 03-03-2015, 03:16 PM
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It will look like this picture. The plunger will be contacting the back of the guide instead of the plastic part that extends off of the back of the guide.
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  #7  
Old 03-03-2015, 04:55 PM
scubacamper scubacamper is offline
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Could something like this be causing my quest to stall while driving it?

It stalled twice today while driving down the road - I'm getting quite irritated...
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