Internal rattle??? - Page 3 - IMBOC
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post #31 of 34 (permalink) Old 11-17-2016, 01:04 PM Thread Starter

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I know its been a while but thought I would give an update. I bought a stethoscope but cant seem to pin point the noise. I did notice that with the cooler temperatures the sound is not there at all until it gets to operating temperature. That being said do y'all think it could be the timing chain tensioners not working properly? OR timing chain itself?
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post #32 of 34 (permalink) Old 11-17-2016, 01:36 PM
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understanding that the motor has at least 80K on it from previous posts on this thread, it could be the tensioners and or chain or the guides. the guide are a plastic or have a plastic what you might call ramp on them and they do wear and that could allow enough slack in the chain to make it rattle. I would think that temperature would not necessarily make a difference but I guess it could. have you listened all around with the scope? are you sure it is not an exhaust leak or a noisy injector?

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post #33 of 34 (permalink) Old 11-17-2016, 09:43 PM

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Dang man, sorry you're still fighting this. If it was an exhaust leak, I would think it would act the opposite. Would seal up once it built some heat. But that would be the simplest solution. I also know when I was planning on swapping heads it was highly recommended that I replace the timing chain and guides because I'd already be pulling the heads anyway. I would think you could put the stethoscope on the front cover and it would be instantly obvious if it was the timing chain or something in that area, especially if you can hear the noise in the car.

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post #34 of 34 (permalink) Old 11-18-2016, 10:21 AM

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That makes some sense. As it gets colder the oil will be a little thicker when you first start it up. The thicker oil is taking up the slack which prevents the tapping noise. As the engine warms and the oil thins out, the noise comes back. Everything is starting to point to the timing chain area. I highly suspect the plastic guides. Those things start to go bad not based upon mileage but more over time as the plastic gets old, hard and cracks. It you go in and replace them, also replace all of those parts for many more years of reliable service. Those plastic pieces that are put in the timing chain area (whether guides, gears, etc) are the weak point of many engines and have been for many, many years.
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