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Help Identifying Source of Rattle Near Timing Belt

 
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  #1 (permalink)  
Old 07 Jun 2016, 01:36 pm
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Default Help Identifying Source of Rattle Near Timing Belt

There is a rattling sound that appears to be coming from the engine near the timing belt. Video of engine Idling and the rattling can be heard:


When the engine revs above roughly 1400 RPM the rattle subsides and can barely be heard.
After the engine is warm and at idle the rattling does not change.

I looked at the timing belt yesterday but I did not try putting tension on the belt between the camshaft sprocket and the tensioner pulley - oh retrospect. Maybe I should check the tension there?
IMG_20160606_115249638.jpg
IMG_20160606_115237850.jpg


Background: Looking at service records the timing belt and water pump were replaced 15k/6 yrs. ago. However, there is no mention of the timing belt tensioner or idler pulley being replaced in the parts list.

Any ideas? What further troubleshooting should I do?

Thanks!
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Old 07 Jun 2016, 07:18 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

Sounds like my wife's 2002. What I hear sounds like valve clatter on the exhaust/back side.

About two months ago her water pump failed (1 year old and under warranty), I took the opportunity to replace all 8 exhaust lifters.

But what I found on the camshaft may have been of greater concern; it had checking (or chips, for lack of a better description) on several lobes. I grabbed a new/used exhaust cam while I had the chance and it did help a little.

Much of the 'rattle' remains and I'll be changing the oil very soon and blending a 5w-30/10w-30 mix to see if this quiets it down. (Have been using 5w synthetic exclusively since we bought the car March 2015.)

The other possibility I suspect - and hope it's not - would be a failing oil pump. Low oil pressure may well be the source, but I'd like to hear others pipe in on the symptoms of such a failure.
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Old 07 Jun 2016, 09:17 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

Quote:
Originally Posted by RCSnyder View Post
Sounds like my wife's 2002. What I hear sounds like valve clatter on the exhaust/back side.
That sounds EXACTLY like my son's 2002. He's had it for about 8 years now and it has always sounded like that. I just assumed it's how the Mopar 2.4 engine sounds when running. I test drove a 2001 last year, and it sounded the same.

My 2006 does not sound like that, but it has a dual exhaust. So... ???

Just my $.02 worth...
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Old 08 Jun 2016, 07:46 am
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Smile Re: Help Identifying Source of Rattle Near Timing Belt

I would concur, that's definitely valvetrain. Worn lifters and/ or cam I suspect. The only real way to tell for sure is to get in there and take measurements. Would I be at all worried about it? Nope
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Old 08 Jun 2016, 01:50 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

Thanks for the replies! I'll just accept the noise as "normal" unless something breaks. It sounds like some model-year PTs just sound like this. I've had the car for 2 years and it's always made this noise.
But I figured since I have silenced a lot of other odd noises this car used to make I'd look into this one.

Just a thought: Maybe it's related to this Manufacturer Communication on the NHTSA web site?

Manufacturer Communication No.: 0900704
Component(s): ENGINE AND ENGINE COOLING
NHTSA ID Number: 10006455
All Products Associated with this Manufacturer Communication expand
Details close
0 Associated Documents
Manufacturer: Chrysler (FCA US LLC)
SUMMARY:
IRREGULAR ENGINE SNAPPING SOUND. *TT


Do you think it might possibly maybe be worth trying Lucas,Marvell Mystery Oil, or a thicker oil with my next oil change to try and reduce the chatter?
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Old 08 Jun 2016, 01:57 pm
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Smile Re: Help Identifying Source of Rattle Near Timing Belt

I really wouldn't bother about it, different or thicker oil won't make it any better, worry about it when it stops making that noise
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Old 13 Jun 2016, 09:53 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

Tonight I had the car up on ramps, working on another issue, and decided I may as well try using a screw-driver as a stethoscope, per another user's suggestion, and see if I can pinpoint the rattle. After putting that screwdriver everywhere else I put it up to the flexplate panel and my ear and I could hear the rattle clearly.

So I am thinking it may either be a cracked plate or there is loose bolt(s). In the next day or two I am going to try and tighten those bolts since it only take about 15 minutes to get to them.

I will post the outcome.

Here's to hoping.
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Old 13 Jun 2016, 10:00 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

When you say "those bolts", I'm guessing you're referring to the torque converter to flex plate bolts?
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Old 13 Jun 2016, 10:00 pm
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Default Re: Help Identifying Source of Rattle Near Timing Belt

Hope only loose bolts
Good luck
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Old 22 Nov 2016, 11:54 am
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Default Re: Help Identifying Source of Rattle Near Timing Belt

I am finding may owners with similar noises, yet advice is all over the map. I have the exact same issue on my 2005. After the car warms up, it seems fine.

Here is another interesting thread:
"engine tapping noise"
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