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

@JeepSheepTV

4 жыл бұрын

That cam/ lifter offset you talk about is such a simple yet elegant way of reducing wear. That's so neat! Thanks for sharing!

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!

@JeepSheepTV

4 жыл бұрын

Thanks! Thanks for watching!

Great series

2.5 yj engine is one of the best engine ever build is immortal

Really good video. Thanks. Engine re-assemble itself? Tony from the auto workers union wants to talk with you about that...

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!

One more question, what was your compression psi on the cylinders before tear down? Where do you think the compression leak was?

@JeepSheepTV

3 жыл бұрын

It was 50-60psi. I think the leak was a combination of the rings and valves.

@michaelthompson1720

3 жыл бұрын

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.

@JeepSheepTV

3 жыл бұрын

@@michaelthompson1720 The reason I think that is because when I added oil (tested wet) The compression increased.

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.

@JeepSheepTV

4 жыл бұрын

Nice!

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

@JeepSheepTV

4 жыл бұрын

Yea I realized later that they separate but it was so much easier to remove them as an assembly so I rolled with it lol. Thanks for the info!

@mlss5413

4 жыл бұрын

@@JeepSheepTV i actually lined mine up 3 teeth off.... probably why my motor is trashed

@JeepSheepTV

4 жыл бұрын

@@mlss5413 I don't think it's an interference motor so you should be able to salvage it. Unless you know otherwise?

@mlss5413

4 жыл бұрын

@@JeepSheepTV yea im gonna rebuild her.....i mean a master kit is only like $350

@JeepSheepTV

4 жыл бұрын

@@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.

So why did the engine sound like a diesel? In your best guess? Connecting rod bearings?

@JeepSheepTV

3 жыл бұрын

It's the lifters. Pretty common for this engine and turns out it's not much of an issue.

@michaelthompson1720

3 жыл бұрын

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😂

@JeepSheepTV

3 жыл бұрын

@@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

@michaelthompson1720

3 жыл бұрын

@@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.

@JeepSheepTV

3 жыл бұрын

@@michaelthompson1720 Yea man, what it lacks on the highway it makes up for on the trail!

lots of time editing. good series.

@JeepSheepTV

4 жыл бұрын

Thanks!

Dude…… really. This is the first engine you’ve ever had your hands on and it shows

@chevrock22

Жыл бұрын

What a dumb comment

@prelaw503

3 ай бұрын

Woah why? Im asking because I plan on doing this for the first time to lol.