You could have an accessery drive bad. It will make an intermitant knock,though.Turn engine off and pry accessery drive pulley forward and backwards, if it moves replace with recon.IF the noise is steady, consistant,look at valve train or piston, rod knock.If noise is at idle but goes away as you slowly increase rpm,it may be normal:the electronic injectors can make it sound like a knock, especially in the freightliner chasis.Also engage the engine fan to run at idle(unplug the fan solenoid,usually on left firewall)It will put a small load on the engine and posibly change your noise/knock; if noise gets better it probably is ok/normal. MARK
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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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