Well, if the rest of it's in good condition, then I'd say run it till the engine gives, then look at used engines and look at new jeeps, price each one. Basically find out which is cheapest. Also depends on if your attached to that particular JEep or not.
Can't help as far as the tap, mines the 5.2. Though it does 'click' some coming from the intake/alternater/top area. Never bothered with it.
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