Question about 2001 Jeep Grand Cherokee

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Ok still tryin to figure this jeep out. 4.7 which has a loud tickin or tapping sound that grows with acceleration. checked all the rockers and the hydraulic lifters and all seemed fine. is it possible the its the a/c compressor? dont know how many times i listened around with a long screwdriver but alot and always end up at the top of the a/c compressor. i can hear like a knockin at the top of it consistent with the revs and the compressor prolly didnt have any refrigerant in it for a couple years. i realize sound transfer, but dont hear it at lower part of a/c or any surrounding spots that are connected to the block since i figure if it was internal ya should be able to hear somethin maybe even louder or more distinct but nothin. its puzzling me, never would think a/c could make a noise that loud and consistent with engine speed. sounds like very very loud lifters but its not. i had changed motors since last one was bad and even the bad one had this noise along with a spun bearing but put the original a/c unit back on so thats why im leanin towards that. so guess im askin if this is posible?

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  • skywarp92 May 10, 2010

    dont i need belt on to start it or how did ya mean to do that?

  • skywarp92 May 10, 2010

    i will do that thanks!

  • skywarp92 May 10, 2010

    took belt off a/c and seemed to help so prolly had 2 noises combining to make it more difficult on me lol. now left with a definate valve tapping sound. i know i checked them all, but unless they are stuck or froze up...how do ya tell between good and bad ones then?

  • skywarp92 May 10, 2010

    sorry... lifter tapping

  • skywarp92 May 10, 2010

    sorry... lifter tapping

  • skywarp92 May 11, 2010

    so whats the best way to prime the lifters before installin the new ones? do i submerge it in clean oil and move the top up and down so oil gets in there?

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Sounds like carbon build up in the combustion chambers remove cylinder heads and clean combustion chambers ,or timing chain slaping the cover

Posted on May 10, 2010

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I would remove the belt from the A/C and run the motor and see if the noise is still there.

Posted on May 10, 2010

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  • James Milzheimer
    James Milzheimer May 10, 2010

    You don't have to have the belt on for the truck to start and run, to charge the battery with the alternator, run the water pump and power steering, you do. You can remove the belt, start it up and run the motor long enough to determine if the noise is still there. I wouldn't try to drive it, just listen to see if the noise is still there.

  • James Milzheimer
    James Milzheimer May 10, 2010

    Well, at least you know now, kind of a process of elimination. Most likely 1 or more are stuck, or not holding oil pressure and collapsing, since they are hydraulic lifters. If it's not too much money, I'd replace them all while you are in there. To test them properly, a machine shop would have to do a bleed down test on them, to see if the hold pressure.

  • James Milzheimer
    James Milzheimer May 11, 2010

    Yes, that's the best way to do it.

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