Sudden onset of a loud banging noise - Team Camaro Tech
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post #1 of 19 (permalink) Old Dec 29th, 09, 06:40 PM Thread Starter
Robb
 
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Sudden onset of a loud banging noise

Here is a long explanation of what I got, I hope someone has some simple suggestions.

Had a well running 350 with a TH400 automatic until a wide open short pass. After the pass, I heard a clacking noise, slowed down and started listenening to it. It eventually got louder and sounded like it was coming from the firewall area. I made it home and parked it in the garage thinking the worst. I took off valve covers and checked all valves, they all seem to be adjusted properly and in working order when the engime is turned over. There is nothing obvious out of place. I started the car again and it fired right up, but the noise was still there. After listening closely it sounds like something hitting metal, like the oil pan possibly. It is hard to isolate where the noise is, but I would say somewhere in the flywheel area, but definatley down low on the bottom end. The noise is consistent but not to fast. It does go faster when the rpms are increased.The trans shifted fine and I still have all gears. The engine sounds fine and does not miss at all, it starts right away and does not sound bad except for intermittent clacking.

What are some things to look for? Could something be hitting in the oil pan while the engine still runs good? Could it be something with the flywheel or torque convertor?

I don't think it is a flattened cam I have been through that before. This sounds different.

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post #2 of 19 (permalink) Old Dec 29th, 09, 06:43 PM
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Re: sudden onset of a loud banging noise

What did the oil pressure do? I suspect you spun a rod bearing.

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post #3 of 19 (permalink) Old Dec 29th, 09, 06:45 PM
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Re: sudden onset of a loud banging noise

Exactly, where is the oil pressure? Drain the oil and take a look inside the oil filter if nothing is obvious.
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post #4 of 19 (permalink) Old Dec 29th, 09, 06:52 PM Thread Starter
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Re: sudden onset of a loud banging noise

I forgot to mention I still have good oil pressure, and that did not seem to be affected.

I have not looked at the oil yet, will do that this weekend. If a bearing is spun will that be obvious in the oil? Does a spun bearing make a loud noise?

Thanks for the replies.

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post #5 of 19 (permalink) Old Dec 29th, 09, 07:12 PM
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Jeremiah
 
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Re: sudden onset of a loud banging noise

I would check the fly wheel, make sure no cracks and bolts are tight.

I use a piece of 3/8" rubber hose with one end to my ear and poke the other into the valve covers etc to better pin point where it's coming from. You can also use a pry bar etc with one end to your ear and the other on the head/block.

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post #6 of 19 (permalink) Old Dec 29th, 09, 07:17 PM
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Re: sudden onset of a loud banging noise

You blew a header gasket.





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post #7 of 19 (permalink) Old Dec 29th, 09, 07:41 PM
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Re: sudden onset of a loud banging noise

Quote:
Originally Posted by JimM View Post
You blew a header gasket.
Good thought, sometimes that can sure sound like a metalic sound.

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post #8 of 19 (permalink) Old Dec 29th, 09, 10:22 PM
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Re: sudden onset of a loud banging noise

The dreaded spun rod bearing. Cross your fingers.

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post #9 of 19 (permalink) Old Dec 30th, 09, 04:41 AM
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Re: sudden onset of a loud banging noise

Diagnose a spin rod bearing by pulling off, one at a time, a spark plug wire to each cylinder.
When the noise changes, the faulty cylinder has been found.
Like JimM suggests, I'd check for a blown exhaust gasket.

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post #10 of 19 (permalink) Old Dec 30th, 09, 04:55 AM
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Re: sudden onset of a loud banging noise

Quote:
Originally Posted by Everett#2390 View Post
Diagnose a spin rod bearing by pulling off, one at a time, a spark plug wire to each cylinder.
When the noise changes, the faulty cylinder has been found.
Like JimM suggests, I'd check for a blown exhaust gasket.
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post #11 of 19 (permalink) Old Dec 30th, 09, 06:50 AM
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Re: sudden onset of a loud banging noise

Sounds like you cracked the flywheel.
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post #12 of 19 (permalink) Old Dec 30th, 09, 07:28 AM
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Re: sudden onset of a loud banging noise

It would of lost oil pressure if he spun a bearing.
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post #13 of 19 (permalink) Old Dec 30th, 09, 11:49 AM
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Re: sudden onset of a loud banging noise

Hopefully you didn't spin a rod bearing. If the torque convertor bolts become loose or break it'll sound like it's about to throw a rod.

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post #14 of 19 (permalink) Old Dec 30th, 09, 05:58 PM
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Re: sudden onset of a loud banging noise

First place I would look is under the dust cover for cracked flywheel or loose bolts. Could be torque converter or front pump.
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post #15 of 19 (permalink) Old Dec 31st, 09, 07:44 PM
col
 
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Re: sudden onset of a loud banging noise

check your bell housing area out first. fly wheel bolts torque bolts that fun stuff.......if there is no loss of oil pressure rod bearing is unlikely
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