HELP! LOL Horrible noise from timing chain area. Lost of slack... - Chevy Colorado & GMC Canyon
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post #1 of 3 (permalink) Old 04-08-2017, 03:49 PM Thread Starter
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HELP! LOL Horrible noise from timing chain area. Lost of slack...

Hey all. I have an 05 with the 4 cycl. Nearly 300K on it. I changed the oil all the time and have kept up with it pretty well.
I'd say the last month or so when I'd start it there was a sound that I'd attribute to like empty lifters pumping up. After a few seconds the sounds would go away and it would run fine. Then about a week ago it started to stay longer and longer and now it does it all the time at low idle. But if I'm driving and the RPM goes above 2000 it goes away. Drop below 2000 it is like a switch, right back on. It sounds horrible. I have a video here. https://youtu.be/s208FAIwWOQ

It sounds like it is coming front the front of the engine. You put your hand on it and you can feel the vibration of the sound. If you open the oil cap while running it is pulsing air out in sync to that sound.

So I had the front cover removed so we can look down in there and the timing chain seems loose but I don't see anything else could be causing this. Any ideas? At 300K should I replace the timing chain while it is apart? https://youtu.be/mhoFsoLSKZk
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post #2 of 3 (permalink) Old 04-08-2017, 05:17 PM
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The video doesn't show the front cover off, just the Camshaft Cover. Something is definitely worn or broken that tensions the chain. There is the tensioner and two guides behind the front cover. The guides are a plastic material and may have worn through.

You are looking at major disassembly to fix this, so you might as well replace anything that is behind the front cover i.e. the chain, sprockets, actuator, guides and tensioner. Probably would be a good idea to replace the harmonic balancer as well. I am pretty sure the balancer bolt is a "one time use" item.

The oil pan will have to come off in order to remove the front cover as the oil pickup tube is bolted to the front cover.

I sent you a PM.
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post #3 of 3 (permalink) Old 04-08-2017, 06:26 PM Thread Starter
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Well, luckily this wouldn't be the first time I tore into an engine that deep. Thank you.
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