sound at start up and shifts

tfish · 05-01-2005, 08:47 PM

I have a 302 crate motor with a rebuilt C-4 and a 9'' in a 67. At start up and when I shift gears around 3-4000 rpms I get a bad sounding dry metal on metal clank. It only occurs about half the time. The sound is like some one dragging a quarter over radiator fins, just a real quick sound. Could this be the alternator bearings or PS pump? It seems to be from the front part of the engine. I have looked underneath it today and don't see anything loose or out of place. The flex plate looks ok. Thanks

Fat0eknee · 05-01-2005, 10:35 PM

engine shifting a little and fan hitting the fan shroud maybe?

tfish · 05-03-2005, 09:02 AM

I don't think so, I have no shroud... If this helps the sound is the same in durration and loudness no matter how it shifts. At start up its about half as long, 1/4 second maybe.. just quick enough to hear it... thanks AJ

Fat0eknee · 05-03-2005, 10:50 AM

no shroud?! ..yeah you need a shroud man to properly pull air through the radiator

~The Jester~ · 05-05-2005, 07:29 AM

Could be dry bearings on the alt. Here's what I'd do. Have someone else start the car while you listen for the sound under the hood. Have them keep starting it while you zero in on the noise.

Bad alt bearings should "fluctuate" in sound though, different RPM usually makes different sounds. Also check that the alt bolt didn't come loose, and maybe the alt fan itself is hitting the casing. Pull the inspection cover, and double check your converter bolts, make sure they're all still tight too.

USMC302 · 05-05-2005, 09:01 AM

Does it only happen under load?

05-01-2005, 08:47 PM	#1
tfish Registered Member Join Date: Nov 2001 Location: Santa Rosa CA Posts: 35	sound at start up and shifts I have a 302 crate motor with a rebuilt C-4 and a 9'' in a 67. At start up and when I shift gears around 3-4000 rpms I get a bad sounding dry metal on metal clank. It only occurs about half the time. The sound is like some one dragging a quarter over radiator fins, just a real quick sound. Could this be the alternator bearings or PS pump? It seems to be from the front part of the engine. I have looked underneath it today and don't see anything loose or out of place. The flex plate looks ok. Thanks

05-01-2005, 10:35 PM	#2
Fat0eknee I'm slow ...I know. Join Date: Dec 2003 Location: houston Posts: 518	Re: sound at start up and shifts engine shifting a little and fan hitting the fan shroud maybe? __________________ When you do things right, people won't be sure you've done anything at all...

05-03-2005, 09:02 AM	#3
tfish Registered Member Join Date: Nov 2001 Location: Santa Rosa CA Posts: 35	Re: sound at start up and shifts I don't think so, I have no shroud... If this helps the sound is the same in durration and loudness no matter how it shifts. At start up its about half as long, 1/4 second maybe.. just quick enough to hear it... thanks AJ

05-03-2005, 10:50 AM	#4
Fat0eknee I'm slow ...I know. Join Date: Dec 2003 Location: houston Posts: 518	Re: sound at start up and shifts no shroud?! ..yeah you need a shroud man to properly pull air through the radiator __________________ When you do things right, people won't be sure you've done anything at all...

05-05-2005, 07:29 AM	#5
~The Jester~ Rat Killer Join Date: Aug 2002 Location: Cold ass Ohio Posts: 1,143	Re: sound at start up and shifts Could be dry bearings on the alt. Here's what I'd do. Have someone else start the car while you listen for the sound under the hood. Have them keep starting it while you zero in on the noise. Bad alt bearings should "fluctuate" in sound though, different RPM usually makes different sounds. Also check that the alt bolt didn't come loose, and maybe the alt fan itself is hitting the casing. Pull the inspection cover, and double check your converter bolts, make sure they're all still tight too. __________________ d-Con Racing "Nothing fancy, just 347 inches of RAT POISON!" MICE need not apply.....

05-05-2005, 09:01 AM	#6
USMC302 Registered Member Join Date: Apr 2001 Location: Gallatin, Tn Posts: 1,326	Re: sound at start up and shifts Does it only happen under load? __________________

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