Squeeling like a pig
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Tuned
Joined: Dec 2016
Posts: 296
Likes: 21
From: Ohio
Squeeling like a pig
My truck, a 78 F150 4.9 NP435/ 205 has developed a squeal. I do have a 3G on it and thought that's what it was. I replaced the belt and it did not stop. It doesn't squeal all the time. It comes and goes. Today it squealed longer than it ever has. About 3 miles worth. It squeals mainly at low RPMs. It will start suddenly and end just as fast. It does not seem to change with RPMs. I filled PS pump. Changed both it and the 3Gs belt. What else could it be?
Laughing Gas
Joined: Nov 2013
Posts: 1,207
Likes: 60
From: S.E. Louisiana;so far USA
It could be many things. If there are other belts, it could be one of them. It could be a bearing in the alternator or water pump or power steering pump. Try some of that anti-squeal belt treatment. Loosen each belt one at a time briefly to see if it stops.
FTE Legend
Joined: Nov 2015
Posts: 30,955
Likes: 4,126
From: Angier, NC
I think each belt dose the water pump so you could pull the ALT belt and run the motor.
It would be a little harder for the PS pump but could also be done the same way.
If you have AC just unplug the compressor so it cant run and the belt just free wheels.
Dave ----
It would be a little harder for the PS pump but could also be done the same way.
If you have AC just unplug the compressor so it cant run and the belt just free wheels.
Dave ----
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Tuned
Joined: Dec 2016
Posts: 296
Likes: 21
From: Ohio
I believe I found it. It finally started to squeal when I pulled in the drive tonight. It's the actual alternator. It came from the junkyard and I knew it was gonna be shortlived because the copper the brushes run on were grooved pretty deep. Looks like it has finally given up. Thanks for all the replies.
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