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| Rattling noise https://www.slantsix.org/forum/viewtopic.php?t=45034 |
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| Author: | monzav8 [ Fri May 20, 2011 7:05 am ] |
| Post subject: | Rattling noise |
Hi, running a 225 from 1977 in a dodge van and I got this rattling noise coming out of the engine, like something is loose and hitting something inside the engine.  The rod and crank bearings are fine, valve lash have been adjusted and the timing chain is OK.I checked the timing chain today and it's fine and the converter, to check if there were any loose bolts. Could to much advance in the ignition system cause this? This sound is new to me, and hope you guys have a clue what it might be! 
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| Author: | wjajr [ Fri May 20, 2011 12:09 pm ] |
| Post subject: | |
Engine or rather odd noise is hard to diagnose without hearing it in person, so be patient with us on this one. Is the noise a deep heavy solid thunk or clunk and rhythmic? Is the noise lighter sound from say a less massive chunk of metal that could have loosened just enough clatter? Is it tinny such as an air cleaner snorkel rattling against a solid object as the engine moves about on its mounts? Dose this noise only manifest when sitting in gear idling at a light, and when a load is placed on drive train dose it go away? Try to describe the sound in more detail, and where it appears to be coming from for us. Things to look at, or rather, listen to: air cleaner and related parts hitting on something; loose flex plate bolts, something internal hitting oil pan; engine mounts; transmission mounts; fan, brake backing plates; exhaust parts too close to undercarriage; etc. |
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| Author: | Fopar [ Fri May 20, 2011 12:27 pm ] |
| Post subject: | |
You might pull dipstick out, some of the others have had their dipsticks broken off. The dipstick should have a slight curve towards the outside of the pan. Richard |
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| Author: | monzav8 [ Fri May 20, 2011 3:19 pm ] |
| Post subject: | More in detail |
The sound occurs at idle, mid-throttle, but seems to fade away when I rev it up. It sounds like hard metal to metal noise, but the sound level and rhytm remains the same at any rpm. Thanks
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| Author: | Reed [ Fri May 20, 2011 3:38 pm ] |
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Might be an exhaust leak. Look for a crack in the exhaust manifold and feels for exhaust leaks around the head and the exhaust manifold to pipe junction. |
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| Author: | ceej [ Fri May 20, 2011 3:44 pm ] |
| Post subject: | |
Exhaust pipe is a possibility. Check to make sure it isn't touching something under the car. It can transmit up the head pipe and sound like it's coming from the engine. It can start at the back of the car, but generally sounds like it's back there if thats the case. CJ |
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| Author: | monzav8 [ Sun May 22, 2011 2:25 am ] |
| Post subject: | Exhaust |
The exhaust manifold haven't cracked as far as I know, and the exhaust pipe is sealed with new gaskets. Going to record the sound for you guys, but for me it seems like the fan is either hitting the trans. cooler liner or there is something laying on the rockers.
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| Author: | DonPal [ Sun May 22, 2011 5:22 am ] |
| Post subject: | |
PCV Valve Rattling? |
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| Author: | monzav8 [ Sun May 22, 2011 1:38 pm ] |
| Post subject: | |
Quote: PCV Valve Rattling?
How loud does is the rattle from the PVC valve?
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| Author: | wjajr [ Sun May 22, 2011 2:25 pm ] |
| Post subject: | |
Quote: How loud does is the rattle from the PVC valve?
Just palpate the valve with your fingers, you may feel a slight vibration as its plunger osculates up & down, and determine if that matches your noise. I’m betting that it won’t be the source of your noise, as the sound from a PCV valve is more of a buzz if it can be heard at all.
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| Author: | 65CrewCabPW [ Mon May 23, 2011 1:27 am ] |
| Post subject: | Re: Rattling noise |
Quote: Hi, running a 225 from 1977 in a dodge van and I got this rattling noise coming out of the engine, like something is loose and hitting something inside the engine.
If this is an auto, your description sounds a lot like loose torque converter bolts.... Or a cracked flexplate. The rod and crank bearings are fine, valve lash have been adjusted and the timing chain is OK.I checked the timing chain today and it's fine and the converter, to check if there were any loose bolts. Could to much advance in the ignition system cause this? This sound is new to me, and hope you guys have a clue what it might be! Even heard vaguely similar noises just from loose bellhousing to engine bolts. |
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