Brief backstory: I had a blown head gasket and cracked head on my 02' 4.0L. The engine was VERY sludgy when I opened the valve cover, not black sludge — more like chocolate milkshake sludge. I got most of it out that I could but I know there are remnants in the engine. When it came time to add oil I did 6 quarts of 5w-30 conventional and a bottle of MMO (hoping to clean out the crud) I went with a new WIX oil filter as well.
On my first drive I noticed good oil pressure (40 psi) until the engine temp reached 210F. The psi was fine while driving but when I stopped at a red light it quickly went down to 10 and then 0 down to the "CHECK GAUGES". As soon as I started driving again the psi went up to about 20.
As for "did you check the sending unit?" Yes, I installed a new Mopar one back before I did the head job.
So I've been reading various threads about low oil pressure but I haven't exactly found the answer to my question. So my question, is this low oil from all the nasty crud I'm trying to flush out and it will get better once I do a flush? OR are the bearings / camshaft / engine internals on their way out the door? And I'm better off saving up for a used engine?
Thanks - I am new to working on Jeeps and engines in general... I downloaded the FSM and watched lots of YouTube videos to get the head cylinder installed in my driveway so I'm trying to learn along the way
On my first drive I noticed good oil pressure (40 psi) until the engine temp reached 210F. The psi was fine while driving but when I stopped at a red light it quickly went down to 10 and then 0 down to the "CHECK GAUGES". As soon as I started driving again the psi went up to about 20.
As for "did you check the sending unit?" Yes, I installed a new Mopar one back before I did the head job.
So I've been reading various threads about low oil pressure but I haven't exactly found the answer to my question. So my question, is this low oil from all the nasty crud I'm trying to flush out and it will get better once I do a flush? OR are the bearings / camshaft / engine internals on their way out the door? And I'm better off saving up for a used engine?
Thanks - I am new to working on Jeeps and engines in general... I downloaded the FSM and watched lots of YouTube videos to get the head cylinder installed in my driveway so I'm trying to learn along the way