4.0 knock noise

[Christian D.]

I attached two videos of my jeep. Both videos are at the same time but just a sound comparison. I also took off the belt so that way there weren’t any other sounds or noises from the parts all moving. I did an engine swap in January from a local you-pull-it. The motor itself has 120000 miles on it. Wanted to see if anyone knew a diagnostic on how I could fix the problem or relieve engine failure for a little longer. (I’m in college now and want to put a crate motor in hopefully in two years) thanks!

 

[Chris]

It's either lifter tick or an exhaust leak (usually in the manifold or downpipes).

4.0s are notorious for lifter tick, though usually they only do it during cold starts, and it will go away after 30 seconds or so.

You can pinpoint an exhaust leak with the soapy water test, but my bet is that it's the lifters.

 

[bromel]

Classic 4.0 lifter chatter. Turn up the radio.