Lifter geometry is interesting, the bottom of the lifter that contacts and rides on the cam faceis sometimes convex with about a 30 inch radius (some may be flat). Take two lifters and put them end to end with the bottom sides in contact, hold them up to the light and you will clearly see this curvature if it is there. Now consider the cam lobe and the wear pattern. There is a sideways slope and the shiny part is the high side. You have a situation where the contact point of the CAM/LIFTER is off-center which will impart a rotation to the lifter. This does a couple of very important things. The rotating lifter bottom now has a rolling contact with the cam face. This GREATLY reduces wear and spreads the wear over a larger area. Without this rotation you would get a wear-line across the bottom of the lifter, slow rotation and lack of oil will produce a concave surface. With the valve cover off and the engine running you can see the push rods also rotating with the lifters. Sometimes the spin fast enough to sling oil
Three seconds of this video ended 2 days of research trying to find the "right" part. Thrust bearing goes on journal 2 not journal 5. No one ever says this. I failed to photo the teardown and 366 seconds in you solved all my problems. Love the videos. Thank you so much.
Thank you very much for this videos man, i own a 2door 98 cherokee with the 2.5 and im just trying to learn as much as i can. No other videos on youtube are this good. Keep it up!
Hi… does the large timing chain sprocket have a pin that connects the sprocket to the cam shaft? If so I did not see you call that out and I am wondering if that is why the whole camshaft came out when you were pulling the timing chain sprocket out…. Tks in advance for your reply!
never saw a Hydraulic lifter taken apart. Oli pressure will "pump up" the lifters to take up lash (technical term for loosey loosey slop) and cushion the valve action. those holes (tech term for orifice) are very carefully engineered for proper oil pressure/operation.
Interesting as mine sits at 90 psi which is probably a very bad sign. The cylinder walls looked good on yours so I am surprised to hear you think it was partially blow by.
The camshaft normally doesnt come out with the gear.....and that gear has a hole that matches up with a pin thats on the camshaft, thats how there is no way to get it wrong....unless u dont match the dots up lol like i did
@@mlss5413 watch out for any machining that needs done. When I priced out what all needed machined, I found that it was cheaper to buy a long block assembly, and easier.
Good to know as I have been running my 2.5 Jeep Diesel over all the Moab trails for years. I always wonder when it is going to give up. I wonder if I should pull the head and replace the lifters? Or just run it until it gives up? How much wear did you have on your cam lobes? I love climbing Metal Masher next to $80k Jeep’s! They laugh until I pass them on the trail😂
@@michaelthompson1720 I thought my cam looked fine but I don't have a lot of experience in that area. I've noticed it quiets down if you let the engine rev a bit more. Like if you shift around 5k rpm a few times. It just helps get oil in the lifters. I've heard of some people using lifter treatment in their oil
@@JeepSheepTV thanks for the response and great videos. I guess I will carry on until it quits. It does quite down a bit once the engine has run for a bit. But wow, it does sound like a diesel for a long time. And, she is a beast on the trail.
