i have a 88 cherokee that im having some oiling issues with its a 4.0 L my problem is i cannot get oil to the rocker arms im worried its a spun cam bearing .... i took the pan off and hoped id find out the oil pump was bad which wasnt the case i chucked the gear end up in a drill and stuck the screen in some oil well it pumps oil just fine can someone please help weve spent hours on building this rig and it really sucks to hit this big of a bumb in the road this close to compleation anyone know what it could be what to check or something im over looking ???? please and thank you in advance my cell is 618 410 2536 if youd rather text it doesnt matter either way just some help at all would be great

 

Is it rattling from the rockers or just flat not getting oil? Mines doin the same thing after a fresh build and 200 miles. I get good oil everywhere but the last 4 pushrods and have a ton of lifter noise. I'm gonna try a high volume pump I guess and ill post the results here for ya.

 

Are the push rods clean/clear?

 

I didnt take the valve cover off but pulled the plug where you fill it with oil and didnt see any oil in there at all. It makes some lifter noise as well. I guess i could try a high volume pump but mine works just fine. Ill also try cleaning the push rod prts. I hope thats it that would be nice and cheap lol. Thanks for the help

 

How's your oil pressure? If its low thAt could be the cause also pull ur push rods and see if u can see day light through the other side

 

As others have said check oil pressure and push rods and oil level also could be your lifters while your in ther check your valve lash almost every lifter noise problem i have worked on has been due to improper tightining of the rocker arms

 

get a oil pressure gauge and pull the dist and check the pressure manually, stock spec is 17 psi i believe

 

How common is it or likley that it could be a spun cam bearing

 

I believe the lifters have their own pressurized oil gallery, separate from the cam. So unless the lifter gallery, or lifters, or push rods are plugged, oil should be reaching to the valve train. Any spun bearing is not good but a spun cam bearing should not stop oil flow to the lifters if I'm reading the diagram correctly.

 

Do you see any when you rev the motor? There is not much flow to be seen through the oil fill hole when engine is idling.

 

What diagram are you looking at. Id like to look or find one myself. That would be great. I changed the oil filter to a brand new one and started the motor and let it idle. Shut it of and now oil got to the new filter. What does this mean to anyone? ??

 

It was the oil pump. I guess even though i checked it out it wasnt building enough pressure .. high volume oil pump from car guest for 70 bucks and its purrin perfect