terrible squalling sound coming from somewhere

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madtom
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terrible squalling sound coming from somewhere

Post by madtom »

My 72 highboy makes a very loud "squall" when coasting. Never when at idle, accelerating or constant speed, but almost always when letting off the gas and it last about 3 seconds. It's hard to tell where it's coming from, but it sounds like right in front of the brake pedal, which would be the transfer case.

My first thought was carrier bearing, but now I'm not so sure. I'm in the process of taking the body off now, so I'll have good access to the drivetrain soon. Anyone else experienced this or have any ideas where to start looking? Thanks for any comments.
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sargentrs
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Re: terrible squalling sound coming from somewhere

Post by sargentrs »

Throwout bearing?
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: http://www.fordification.com/forum/view ... 22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
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cep62
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Re: terrible squalling sound coming from somewhere

Post by cep62 »

Before you take it apart , try to diagnose it.
Support the back axle with some good stands and run it.
Without a load it might not make the same noise , but maybe something close.
When you're driving , then coasting you're loading the gears and bearings differently and if they're worn can make some noise.
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Re: terrible squalling sound coming from somewhere

Post by madtom »

Good idea. Thanks
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Re: terrible squalling sound coming from somewhere

Post by madtom »

I've got the motor out and the body is off the frame, so I can see everything real good. Is there anyway to tell if the throwout bearing was the culprit by looking at? It turns smoothly by hand and everything looks pretty normal.
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Re: terrible squalling sound coming from somewhere

Post by Ranchero50 »

terrible squalling sound coming from somewhere
Usually that's just the wife...
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sargentrs
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Re: terrible squalling sound coming from somewhere

Post by sargentrs »

:yt: :lol:
madtom wrote:I've got the motor out and the body is off the frame, so I can see everything real good. Is there anyway to tell if the throwout bearing was the culprit by looking at? It turns smoothly by hand and everything looks pretty normal.
Unfortunately, not a lot you can about it now. About the only thing you can do is to try to spin it real fast to see if maybe it might've had a little play/wobble in it. How did the fingers on your clutch pressure plate look and feel? How about the surface of the flywheel? Smooth? Cracks? Glazing? How about the Z-bar (bell crank) pivots for the clutch pedal? A lot of moving/wearable parts go with a manual transmission/clutch assembly. Any of which could cause an odd sound under certain conditions.
Randy
1970 F100 Sport Custom Limited LWB, 302cid, 3 on the tree. NO A/C, NO P/S, NO P/B. Currently in 1000 pcs while rebuilding. Project thread: http://www.fordification.com/forum/view ... 22&t=59995 Plan: 351w, C4, LSD, pwr front disc, p/s, a/c, bucket seats, new interior and paint.
1987 F-150 XLT Lariat, 5.0/C6 auto.
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ezmerf
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Re: terrible squalling sound coming from somewhere

Post by ezmerf »

A mechanic's stethoscope will help are a wooden dowel.
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Re: terrible squalling sound coming from somewhere

Post by Lee »

If adjusted correctly the Throw out bearing should not be in contact with the Pressure plate while you are experiencing the sound (coasting) ,.... that is unless you are coasting with the clutch pedal in.

Lee
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