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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