Strange, LOUD noise after engine is turned off - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

burnin oil · 04-28-2020, 11:34 AM

Probably the starter hung. Next time you start it drive a few hundred feet and touch the starter. If its really warm the starter is toast. They will screech sometimes since the bearing isn't designed for cruise RPM. A side possibility is a worn ignition switch powering it in both state and run positions.
A throw out bearing can make a loud screech but can normally be heard above the engine. I can hear mine over 2 chamber mufflers when its acting up.

**Boog** · 04-28-2020, 12:11 PM

If the outer ring of the damper had slipped it would not continue to spin well after shut down.

**jaros44sr** · 04-28-2020, 12:20 PM

You don't have electric fans or electric water pump on it by any chance, couldn't see in the pic

hamjet · 04-28-2020, 02:59 PM

By reading your 1st post, you shut it off. noise started. you let the clutch out, engine not turning. still making noise. YOU STARTED IT UP AND BACKED OUT OF THE GARAGE. can't be the starter spinning or you would definately know when you started it up if the starter was already spinning.... could it be something crazy like built up pressure in the radiator blowing out the rad. cap making a strange noise, like when you blow through a blade of grass up to your mouth? everything else has been asked..please find the problem, it's killing me! lol....

04-28-2020, 11:34 AM	#26
burnin oil Registered User Join Date: Jan 2013 Location: Eastern TN Posts: 1,921	Re: Strange, LOUD noise after engine is turned off Probably the starter hung. Next time you start it drive a few hundred feet and touch the starter. If its really warm the starter is toast. They will screech sometimes since the bearing isn't designed for cruise RPM. A side possibility is a worn ignition switch powering it in both state and run positions. A throw out bearing can make a loud screech but can normally be heard above the engine. I can hear mine over 2 chamber mufflers when its acting up.

04-28-2020, 12:11 PM	#27
Boog laying low Join Date: Mar 2001 Location: Searcy, Ark. USA Posts: 13,535	Re: Strange, LOUD noise after engine is turned off If the outer ring of the damper had slipped it would not continue to spin well after shut down. __________________ Boog 69 Chevy stepside, 358/T350, 4.11 posi, 4.5/4 drop, rallys, poboy driver primer is finer 91 Chevy sportside, Tahoe, Yukon & GMC Crewcab All GM..'nuff said. I stand for the flag and kneel at the cross

04-28-2020, 12:20 PM	#28
jaros44sr Senior Member Join Date: May 2006 Location: Philadelphia, Pa. 19454 Posts: 9,766	Re: Strange, LOUD noise after engine is turned off You don't have electric fans or electric water pump on it by any chance, couldn't see in the pic __________________ Semper Fi...Uncle Sam, you da man All parts offered to help are free, unless otherwise noted Dont try this stuff in my build thread, unless you have 55 years of mechanical OTJ training SAFETY FIRST AS usual, off topic They say your mind goes second, can't remember the first Jim

04-28-2020, 02:59 PM	#29
hamjet Registered User Join Date: Apr 2013 Location: South Westerlo, New York Posts: 1,325	Re: Strange, LOUD noise after engine is turned off By reading your 1st post, you shut it off. noise started. you let the clutch out, engine not turning. still making noise. YOU STARTED IT UP AND BACKED OUT OF THE GARAGE. can't be the starter spinning or you would definately know when you started it up if the starter was already spinning.... could it be something crazy like built up pressure in the radiator blowing out the rad. cap making a strange noise, like when you blow through a blade of grass up to your mouth? everything else has been asked..please find the problem, it's killing me! lol.... __________________ Thanks, Joe.. 1969 C/10, 348 C.I., 3X2 bbl. V8, 2004r , LWB.



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