truck runs but belt turns slow and is making a noise
1988 f150 2wd 4.9l starts runs but is not rite sounds and looks like the crank
pullys slipping with a noise in the front bottom of motor. I looked at the valves
and they seem to be fine thruogh the valve cover
Is the belt good? Is there a tensioner on the motor to keep it tight? Is tension of the belt provided by adjustment to something like the alternator? Tensioners on late model vehicles is provided via a spring loaded system with a pully attached about three inches in diameter. The bearing does go out which will cause a noise. Check it if your vehicle is so equipped. With the belt off, if the tensioner wiggles back and fourth from back to front it's shot.
All brand new
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