Engine Squeal
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Junior User
Joined: Apr 2017
Posts: 58
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From: Canton
Engine Squeal
Some background: 400 in a 1969 F100, been in storage for about 20 years. I changed the oil, and reprimed the system until there was oil lubricating valve train through the push rods. Got it fired up and noticed a very loud squeal from engine. One by one, I unhooked the following to identify the source: power steering pump, alternator, fan/water pump. Squeal still there, unfortunately. Could this be a cam or crank bearing? I'm hoping its not something major but am not confident at this point.
I read where bad vacuum lines can cause a squeal, but this noise follows the RPM range - gets louder with more RPMs. Its really tough to narrow down exactly where it is coming from, but it appears to be the front of the engine.
thanks.
I read where bad vacuum lines can cause a squeal, but this noise follows the RPM range - gets louder with more RPMs. Its really tough to narrow down exactly where it is coming from, but it appears to be the front of the engine.
thanks.
Fleet Mechanic
Joined: Feb 2015
Posts: 1,661
Likes: 111
From: southwest missouri
A friend had a crate motor from a national supplier and his squealed at low r p m's it was a chevy but still same. Turned out to be cam bearings and maybe cam the well know company would not do a thing the only good that came out of this he swore off chev's if he would have kept the truck he was going to put in a 302ford I wish that had happened.
Laughing Gas
Joined: Feb 2003
Posts: 1,234
Likes: 3
From: In the woods of Oregon
awesome you fixed the problem and than finished off the thread with the solution. So many times I have done a search, got to the end of a thread and no solution. Its a real bummer! A vacuum leak you say, must have been one hell of a leak to sound like that.
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Donny Q
1987 - 1996 F150 & Larger F-Series Trucks
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Dec 2, 2006 01:17 PM
