JERRY T

Looks like it is leaking betweene the head and block on pass side 2003 4.0L is this a normal leak or is the gasket blowen? is not running hot and it does not seam to have any power los frist Jeep os i'm lerning about 4.0L now. as i go.

kjc

No leaks are 'normal'.. if oil is coming out from under the head, it's most likely a leaky head gasket. Clean it real good and make sure it's not the valve cover leaking and running down.

JERRY T

Thanks for the in put.

BrofessorXJ

Most likely the oil filter adapter or the "elbow". That sits on the passenger side and a little leak can spray oil everywhere when driving. Prone to leaks and a pita to change the o rings in them.

cruiser54

My standard response:

I'd be looking up above first. A leak at the back of the valve cover could produce the same symptoms. Don't jump on the RMS/oil pan gasket bandwagon just yet.

Almost any oil leak on your 4.0 is gonna drip from the RMS area for 2 simple reasons. First off, the engine sits nose-up and oil will run back to that area. Secondly, the RMS area is also the lowest point on the engine. Simple physics and the old plumber's adage apply here. "$hit flows downhill".

Valve cover gasket, oil pressure sending unit, oil filter adapter seals and distributor gasket have to be eliminated as possibilities first.
Revised 3-23-2012

Matts Jeep

Agreed, it happened on my '98 XJ and once i replaced the gasket on the "elbow" it was all fixed. Also if it is a small leak you could try looking at the sending unit and see if it is leaking from there..just a thought.