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Engine noise in 460 1983 E 350

Clanking sound in 460 1983 engine after engine warms up and at slow idle (750 rpm). Noise is in front of engine by lower timing sprocket. Timing sprockets and chain have been replaced as was water-pump. It sounds like a loose chain slapping against side of oil-pan. Noise goes away at 1100 rpm. Fuel pumps are in the gas tanks. I suspect a piston rod sliding around or some sort of piston slap. Desperate for help as this is my motorhome with only 65,000 miles on it.

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  • oremins1 Jul 03, 2008

    Timing chain and sprockets were replaced. Could it be excessive carbon build-up at upper section of one cylinder?

  • oremins1 Jul 05, 2008

    Thank you. I have a stethoscope. The clatter sounds like something is hitting the oil-pan, from front to back. Today it was 31 degrees Celsius and the noise started after about ten minutes after start-up. I removed spark plug wires one at a time and this of course made the engine shake. The clatter was loud and consistent. Engine mounts are new so it is not external to the engine unless it is the "flywheel". It has an automatic C-6 transmission.

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Hi, I have a 1999 Ford Expedition Eddie Bauer......2 days ago i heard a loud clanging, today it is really loud and EMBARRASING....and frustrating.....just wanna give you guys input I heard from 3 close friends that are mechanics........the consensus was that they are ALL saying it is my flex plate.....and they think it is cracked.......they all told me if i do not get this replaced asap, i will NOT be able to start it up......right now it is SOOOOOO LOUD!!!!!! Then I was at a Wawa and a random guy came out shaking his head, so I got out and said "Do you hear that"? He said it reminded him of his truck he had about 15 years ago....he said it is the Plate between the engine and tranny, which is the flex plate, he said his had a small crack in it and started out pretty loud and got louder and louder day by day......he said his mechanic said the crack went to the area it is bolted and got louder.....but he said he replaced the flex plate and the noise stopped.......the whole time his truck ran fine, just loud.......so the general consensus is I need to replace the flex plate.....hopefully it will not cost that much......the rough price I got from 5 different guys was around $400-800.....so im gonna get it fixed and sell the Expedition, anyone wanna buy it? I love it but I wanna get something newer since I can probably get a helluva deal on something newer.

Posted on Nov 09, 2009

I focused on the flywheel and discovered a bit of a wobble at 1050 rpm. I carefully scoped out the noise position with a Stethoscope and discovered that the engine block itslef had no clatter but the oilpan sounded like a drum (That's odd). The viewing port on a FORD is very small so I could not see much of Flywheel. I scoped the metal plate between the engine and tranny and discovered a loud clatter spot there. Based on all this I took the vehicle to Transmission repair shop and $630.00 later the cracked Flywheel was replaced and the noise is gone.

I apparently had about 100 km's to a catastrophic destruction of the Flex-Plate ("Flywheel"). Again the clatter sounded much like loose main bearings BUT there was no noise on the block itself, ruling out a loose crankshaft.

Thanks for your help.

Posted on Jul 10, 2008

Not loud enough to be a loose connecting rod. Flywheel looks okay. Based on input so far and what I have been able to read it likely is the main bearings of the crankshaft - likely the middle one being the worst. My worst fear. I had over-heating problems two years ago. After much agony and money and effort, at my insistence Midas replaced the muffler. It was plugged badly, but the damage was done. Thanks for your help. This is a motorhome. Now can I get 1,000 km (650miles) for my vacation or do I risk a break-down in this range of use?

Posted on Jul 07, 2008

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This is hard to diagnose without hearing it but its either the timing chain or wrist pin on a piston

Posted on Jul 03, 2008

  • james kilgore
    james kilgore Jul 05, 2008

    no carbon buildup makes a pinging noise under power, one thing you can do is take a piece of metal and hold it to the engine in different places it will transfer the noise up the metal an extension works good, this will pin point the noise and let you know exactly what it is.

  • james kilgore
    james kilgore Jul 06, 2008

    if its sounds through out the oil pan its either a conecting rod or the fly wheel is broken can you remove the dust cover from the flywheel and inspect it while its running you would be able to see it wobble if its broke use a flashlight.

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