Whats this sound!?!? New Motor... Video inside

C

chrisf695

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I just got my 408 sbc running Saturday and Im getting this sound from it. Once its warmed up it goes away and if you give it throttle it goes away. I have good oil pressure and no misfires. Kinda baffled...

Things that come to mind... pistion slap from short skirts, exhaust leak, lifter clearance?

408 sbc startup noise - YouTube

Powerplay XLT Integra with 408 sbc - YouTube

Any help would be nice!
 
Grandad

Grandad

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Re: Whats this sound!?!? New Motor... Video inside

Hi Chris, I'm no expert but, those belts seem to have a lot of play in them. Is the tension correct? Stopping the first video shows quite a resonant wave in the belt at about the 19 - 20 second mark. - Grandad
 
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chrisf695

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Re: Whats this sound!?!? New Motor... Video inside

Wow... now that you said that... that is alot of play... Can that cause noise like this at all?
 
Don S

Don S

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Re: Whats this sound!?!? New Motor... Video inside

Get a mechanics stethoscope and pinpoint where the sound is coming from exactly.
Kind of sounds like it's coming from the timing chain cover in the video.
 
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chrisf695

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Re: Whats this sound!?!? New Motor... Video inside

Don S said:
Get a mechanics stethoscope and pinpoint where the sound is coming from exactly.
Kind of sounds like it's coming from the timing chain cover in the video.
Click to expand...


Ill pick a stethoscope tonight... but looks like its coming from the alt... the power steering isnt moving in the video and the belt is all uneven... looks chewed up...
 
Grandad

Grandad

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Re: Whats this sound!?!? New Motor... Video inside

chrisf695 said:
Wow... now that you said that... that is alot of play... Can that cause noise like this at all?
Click to expand...

I dunno if that's the cause of the noise, but if they're slack it can't be good for accessories or for the belts themselves. - Grandad
 
Don S

Don S

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Re: Whats this sound!?!? New Motor... Video inside

Take the belts clear off and start it for a minute and see if it makes the noise. It won't overheat that quick.

If the noises are gone, you know where to start looking.
 
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