I have a "unique" hum coming from my motor as of this afternoon. Seems to be coming from the frontish portion, under the valve cover (Imagine that!) Does not seem to effect performance, meaning the truck felt the same on the ride home, but loud none the less. The truck is an '86 with a non feedback single, and a hydraulic lifter is/does occasionally stick.

Any help is greatly appreciated.

Josh

86' D100 stock slant six 4spd

I would pop the valve cover off for a look see. It may be a lifter or push rod. Or it may be gum and gunk building up. Better now than gauling a lifter bore or worse.
Frank

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Scrapple: Because a mind is a terrible thing to waste.
73 Duster - Race Car
66 Dart Wagon - DD
178" FED
82 D150
All Slant powered

I think I had that noise.........

I thought it was an alternator bearing, but disconnecting the belt didn't make it go away until..........

It went away when changing from dyno to 10w-30 synthetic oil........

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Ed
64 Valiant 225 / 904 / 42:1 manual steering / 9" drum brakes