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#1 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
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High pitch squeal under acceleration
If I step on the gas I get a high pitched whistle, like a TING!........It doesn't always occur under the same RPM, and appears influenced by a rapid increase in acceleration.
I'm mostly certain I've heard the same in drive, and this has been going on a long while, despite lubing the belts and pulleys. It's just more obvious in park. Other than that, the engine sounds good. If necessary, I could create a video. Thank you.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#2 |
Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,218
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Re: High pitch squeal under acceleration
That is usually caused by a belt. Try tightening the alt belt. Sometimes a fan clutch is locked up or has been replaced with a heavy duty fan can put excess torque on the belt. If a guy has removed the A/C belt it will put too much load on the alt. belt.
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#3 |
Scrapper 1
Join Date: Jan 2007
Location: Riverside Calif
Posts: 1,649
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Re: High pitch squeal under acceleration
my one ? dose your truck have the AC compressor on it.Check as see if the compressor is locked up.the other thing is start checking bearings ALT power steering pump water pump smog pump all have center bearings.
2 take off all your belts look at your pulleys see if they look like glass in side means your pulleys need to be roughen up a little or your pullets are no good any more if your belt dose not stick up a little bit over the pullet too small of belt |
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#4 |
Registered User
![]() Join Date: Apr 2012
Location: Stillwater, Oklahoma
Posts: 874
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Re: High pitch squeal under acceleration
Read through this thread. I had the same problem. Starter hitting the flywheel under acceleration/ deceleration / under load.
http://67-72chevytrucks.com/vboard/s...d.php?t=569719
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1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#5 | |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
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Re: High pitch squeal under acceleration
Quote:
Edit: I bought a new fan also. Board member restores them. If it works like it looks then I couldn't be happier.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 Last edited by 71CHEVYSHORTBED402; 04-09-2016 at 11:08 PM. |
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#6 | |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
|
Re: High pitch squeal under acceleration
Quote:
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#7 |
Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: High pitch squeal under acceleration
To isolate just remove the alternator belt and ( i have done this ) find a place it will hang free without hitting the power steering belt, fire it up and rev it, if the squeal stops you know its the alternator belt. I have been thru the frustration, deglazed the pulleys with sand paper, different pulleys, over tightened to the point of destroying bearings in the alternator, new sets of belts, checked pulley alignment ect. Whats frustrating is the truck was fine for years after my rebuild, then it decided to start making noise.. I can still get it a little bit but its not near what it was.. Frustrating.
The only thing i didn't try was to remove the fan blade ( i don't have a fan clutch ) and put it back together with just the water pump pulley, if you try that it will reduce the drag on the belt and may stop the squeal?? If that works try purchasing a fan clutch.
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Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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#8 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
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Re: High pitch squeal under acceleration
Good advice, thank you for all the responses. I'll wait to diagnose during rebuild. With a some luck I won't have to.
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#9 |
Registered User
![]() Join Date: Apr 2012
Location: Stillwater, Oklahoma
Posts: 874
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Re: High pitch squeal under acceleration
Do you have a hi-torque starter? Both mine and the other guy's truck with that issue did.
__________________
1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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#10 |
Senior Member
![]() Join Date: Feb 2009
Location: Northern Nevada
Posts: 7,250
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Re: High pitch squeal under acceleration
I replaced it about three years ago, but I don't remember what it is....though HT does sound familiar. I had to shim it once or twice. I'll probably replace it again, considering a new flex plate. Any recommendations?
__________________
Tony 71 Custom Deluxe, SWB, 2WD, 402, A/C. I developed an assembly kit for restoring the (a) truck from the ground up. My build thread, and more on the assembly kit https://67-72chevytrucks.com/vboard/...d.php?t=730025 |
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#11 |
Registered User
![]() Join Date: Apr 2012
Location: Stillwater, Oklahoma
Posts: 874
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Re: High pitch squeal under acceleration
Well, we both had to shim ours, or go back to a stock one.
You could also buy a starter for a '90's Chevy. Read this thread, TXfirefighter describes how he uses a (mini) starter from a '98 Tahoe as a direct bolt on replacement. http://67-72chevytrucks.com/vboard/s...d.php?t=622405
__________________
1971 C/10 SWB, 15x8 Rallys, 4.5" X 7" static drop, C-notched, 350/350, 3.73 Posi. .........A 383 and Gear Vendors are on my bucket list. 1972 GMC 4X4 K1500 Survivor - Sold No matter what problems life throws at you, your time on Earth can be incredibly fulfilling and rewarding.....if you just lower your expectations. -Phil Dunphy |
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