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Here are 3 causes for lifter tick!
Bad Lifter, Dirty Oil Deposits, Bent Push Rod, The rocker arms will make a noise if push rod clearance is not adjusted right. God-Bless! and hope this helps you!or the rocker arms may be worn.
All of the engines I've played with that had hydraulic lifters also had hollow push rods. The lifters act like little pumps and oil comes up through the push rods to lubricate the end of the rocker arms.
flat end down onto the cam
hole end up for the push rod to sit in.
Your push rods are different lengths. The intake push rods are the shorter ones and are marked with yellow paint. The exhaust push rods are marked with green paint. Double-check to make absolutely certain that you have them all in the correct position. (failure to do so will cause IMMEDIATE severe engine damage when the starter is cranked.)
Other than that, it is common for the lifters to leak down when the engine has been disassembled. I have even had several that made it very hard to start and "clattered" for like 5 minutes after starting the engine. It will be OK when the lifters pump back up.
You may not have a lifter noise. I seem to recall reading about the 4.0L (not sure if its just 4.0L that were affected or sure about years affected as well) having bad push rods that would mushroom on the tips and cause what sounds like a lifter noise.
They would need to be inspected to know for sure. And if this is the case some hardened push rods should be installed as well as rockers. The rockers could be damaged from the push rods and they also wear in with the push rods so old rockers and new push rods may not mate well.
lifters ride on loped surface of the cam shaft the other end of the lifter a push rod sits on , when the cam shaft rotates the lifter moves up and down allowing the push rod to move the rocker arm which opens and closes the valves.
hold up rod bearings were did you get that?lets take it from the top.camshaft lobs move lifters on rotation,which lifters move push rods,push rods push valves up and down,which other side of valves push up and down valve stems,which open and close exhaust and intake stems.ok now were clear on that to see your push rods.take off your valve covers on side with tick.1.check for valve loosness.need a feeler gauge for this and specs for you truck to do this.because ticking is mostly associated with valve loosness or to tight.2.if rod is bad loosin valves but not off and inspect the rods for bends.on a flat surface.replace if bend.also make sure they to go back in same place.and repeat step 1.finally noise continues need to take in and checked possible internal damage.
Where did it go?? Just wore through? You have to get the lifter out of there and replace it with a new one, or a used one. For some reason, it is not getting oil. You might be finding more damage as you go. One of these days you are going to have to fix that engine right, new cam, lifters, etc. You can make a hook out of 1/4 inch rod, grind a flat spot in it with a small shelf left at the bottom for the hook, it will grab the edge of the lifter and pull it out. Hope this helps.
If it has push rods, you will find them under the rocker cover on the top of the engine, they are hiding under the rockers. The rods ride on a lifter that rides on the cam and then they push the valves down, and squirt oil all over everything, a spring brings them back up. The overhead cam eliminated all these extra parts. Lifters, rods, rockers. Hope this helps.