94cherokeeman

My motor has had a knock for a little bit now I here it more now what can I do? Also how long will it take to pull it out and a new one put in

1991Jeep_Man

Try running a heavier oil. I run 5w40. Didn't really have knock, but there was little noises that the heavier oil cleared up. I ran the 5w because of winter. If you're knocking, I'd suggest sticking with a 10w40.

94cherokeeman

I have 10w-30 with Lucas in it

1991Jeep_Man

...oh. Then if you're running lucas with a 10w30, Idk what else to offer. Lucas itself is already nothing but a thickener.

94cherokeeman

Thanks anyway

Firestorm500

Don't use Lucas. Drain the oil, change the filter using a good brand, and put good 10W-30 in it with no additives.

A thicker oil strains your oil pump and doesn't lubricate the bearings as well.

Thicker oil doesn't prevent or cure engine wear. It actually accelerates it.

DFlintstone

Did you check the torque converter bolts? They are known to loosen and knock like hell. And Amen ^...my pump must be REALLY strained, pushing that 30W for 263,000 miles. (OK only the last 120K for sure!)

pulltabmike

A little more info please....Mileage, oil pressure, last tuneup. Is the knock coming from the bottom of the motor or higher up? Could be a couple of reasons that do NOT require a rebuild or new motor.
PM Bohnett and see how far he is from you, he may be able to stop by and help you idenify the problem.

cruiser54

What brand of oil filter are you using?

And the torque converter to flexplate bolts, if you have an auto trans, and has already been suggested, is where I would start.

94cherokeeman

Ok its a out 230,000 miles index at running temperature going 55mph the oil pressure is at 40psi, and the knocking is hard to tell if you r under the hood it sounds like it is on top but if u are going into the cab with the door open it sounds like its coming from the bottom, and I am using mobile1 oil and frame oil filter

1991Jeep_Man

Not entirely true. Going overboard with 20w50 or what not will do harm, but Xw40 oils have been proven to show lower wear numbers in UOA's.

xjsnake

Get rid of the fram filter. I know some people say they run them and are fine but I've used them in the past and my engine runs quieter now that I've switched brands. Go with Napa Gold (made by wix), wix, mopar, Mobil 1 or Motorcraft oil filters.

94cherokeeman

How do I find bohnett? Im on a moble app

Firestorm500

As I have said before, the salvage yard is full of vehicles with Fram oil filters.

The Orange Can Of Death.

cruiser54

The old OCODs. More than likely the singlemost cause of bearing failure in our beloved 4.0s.

That said, it sounds like the OP may have loose TC to flexplate bolts since he has good oil pressure. Have we determined he has an auto trans?