Screeching Belts or Something?
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New User
Joined: Mar 2009
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Screeching Belts or Something?
I have a 1986 F150, when I first start it up there is an ear piercing screeching sound that goes on for about 10 minutes, it will finally stop once the engine warms, but everytime the engine is shut off and re-started it happens again. I have had the belts checked by a local mechanic who said the belts were too tight and it rectified the problem only for a short period of time, like a week. I have put Belt conditioner on the belts, to no avail. Anyone out there have any idea what this screeching noise could be or how to fix it? Thanks
Moderator
Joined: Nov 2007
Posts: 22,415
Likes: 92
From: Denver Metro Area, CO
Could also be bearings in one of the accessories.
I would remove the belts, probably one at a time, and start the engine after removing each one and see if the noise disappears or not.
When the noise stops, you've found where to spend more time investigating.
I would remove the belts, probably one at a time, and start the engine after removing each one and see if the noise disappears or not.
When the noise stops, you've found where to spend more time investigating.
Logistics Pro
Joined: Jan 2002
Posts: 3,739
Likes: 3
From: GANS
ctubutis hit the nail on the head.
You could just try unhooking the belts and turning the accessories by hand to feel the bearings.
Also, I have a 135 amp alternator. It does the same thing until the battery catches up with the charging (I only have it on one v-belt instead of two).
You could just try unhooking the belts and turning the accessories by hand to feel the bearings.
Also, I have a 135 amp alternator. It does the same thing until the battery catches up with the charging (I only have it on one v-belt instead of two).
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
Consider the harmonic balancer. My son's 1984 4.9L did the same. You can make a mark across the balancer with a crayon or marker and then drive. Later, check to see if the "line" has shifted. If so, the rubber has broken down.
