my 4.0 sounds like a diesel :(

[XJLI]

Hmph.

[grundlepunch]

your bexter spring is shot, making the rattling noise. replace it or just re-lube it if its still in spec.

[Pete]

i have 190k on mine its still quiet and 40 psi of oil pressure at idle but im still keepin my eyes open for a low mileage one to rebuild or as least freshen up. sounds like top end on yours is going

[Rowdy XJ]

Is there a way to check your compression??

[XJLI]

Is there a way to check your compression??

yes, its called a compression check.

[wannabejeep]

i have 190k on mine its still quiet and 40 psi of oil pressure at idle but im still keepin my eyes open for a low mileage one to rebuild or as least freshen up. sounds like top end on yours is going

40 psi of oil pressure? must be nice...

[Arundlemcbrundle]

oil pressure is no problem for me. 60 at idle an 80 when driving. jeep has 180K on it tho. i took it to my friends shop and he thinks one of my lifters is shot. he's gonna tear it down tomorrow.

sucks cuz i wanted to get rid of this thing and buy a tj this summer but its kinda hard to justify after i just put all this money into it

[CumminsJeep]

oh man that sucks dude. start using diesel oil. I run mobil delvac 15 40 in the cummins. but rotella is good too

[XJFez]

yes, its called a compression check.

My 93 used to do this after fresh oil changes....couple hundred miles after, it would quiet down again....i figured it was just the norm. for the 4.0...ive heard the same noise more often than finding a quiet one.

[Rowdy XJ]

yes, its called a compression check.

[Ruecifur]

could be the timing chain guides... sometimes they wear out and it sounds like hell coming from the motor. put a long screwdriver up to the timing cover and listen... if it's loud as shit there than you've found your problem (and pray that thats what it is... cause thats a lot easier than rebuilding the bottom end)