EZridaz
NAXJA Forum User
- Location
- Charleston, WV
I have a 1998 XJ with 112,500 miles,4.0. About a week ago I had to replace the rear main seal as it was leaking a drop here and there. I really could have waited but I am anal retentive about things like that and take care of them asap. So while I have the pan off I decide to do the oil pump with a Melling high volume pump with pick-up tube since it was cheaper than an OEM without the tube. Nothing was wrong with the old pump as it held good pressure.Cold idle was around 35-40 psi and 2200 rpm was around 40-45 psi and hot idle around 20-25 psi. So I changed the rear main and torqued the cap from 40-60-80 ft. lbs.. I "massaged" the pan as I did have a clearance issue with it hitting and had to carefully bend the tube up from the bottom a little bit as it was hitting as well. Next I add the oil back in which is Valvoline Max Life Full Synthetic 10w-30 and a WIX 51515 filter as I always use. So now I have a cold idle oil pressure of 55 psi.,a hot idle oil pressure of 40 and at 2200 rpm/ 60-65 mph and an oil pressure of 65-70 psi.. That was the part that was worried about is the 65-70 psi while I'm running on the interstate. I am afraid that the pressure will make the cam walk or wear my distributor gear. I do hear a tink tink tink in there that wasn't there before but I believe I didn't bang the pan out enough and am getting a vibration from the pump against it. The pan went on fine which lead me to believe I had clearance but I guess it was just enough to clear it. So I went and bought a mechanical gauge and it confirmed my dash readings, so I ruled out the oil pressure sender and dash gauge going bad. So today I take the high volume one out and put in a "regular" Melling oil pump and the readings is even higher! WTF!!! It is about 55-60psi at cold or hot idle at 600rpm and when I get to say 1500-1800 rpm it pegs over to 80psi on the dash gauge and mechanical gauge. Sorry to be so long winded but I'm trying to get all the details out of the way. Any help would be greatly appreciated!!!