I Found A Surprising Secret During My Jeep 4.0 Rebuild - Must Investigate Later! 

I had the piston skirt break off on my 4.0. Got some sealed power pistons, hastings rings, sealed power bearings and a melling oil pump. Rebuilt it in about 3 hours. One of the easiest engines that I have worked on.

It amazes and saddens me how people can abuse and neglect these beautiful 4.0 engines, when with routine maintenance you can get at least 200,000 dependable miles out of them.

Great video! Not to sound rude, but try to remember those safety glasses. Really. I had glasses on and a welding shield when grinding. Got a piece of dust in my eye. Thought it was an eyelash or something. At midnight I was driving myself to ER cause I couldn’t take the pain anymore. I flushed the metal out but it rusted on my eye. It hurt, I assure you. Messed up my vision too after they grinded the rust off my eye.

The fact that the old skool hot rodder who has lived through the pinnacle of speed and design on American cars has now got hooked with the xj, my generations hand me down do any thing vehicle is some thing special to me. You rock Tony I believe your genuine

I know you worry about how long your videos are but I swear it's funny: This video was almost an hour but seemed like only half that. I guess time flies when you're enjoying something.

Looked like the cylinder head was pinned. Had to have it done on a Chevy 250 because I could not find a non-cracked head anywhere local.

The stitch weld was very cool. Thanks for sharing

The company Lock and Stitch makes something for fixing cast iron cracks maybe that's what you're seeing there on the head....check it out 👍👍

Love all your content I bought the red hat I had you sign before sending to me. I own 3 xjs and 1 2004 Wj 4.7 HO wandering what happened to the 4.7 ho motor content you were doing on the lifted wj. I enjoy learning what your know thanks for making RU-vid videos

I love your videos Dex don't worry about the length of your videos you teach so much it's worth every minute

Evaporust thermocure is awesome for rusty coolant passages in a block. Just got done running it through mine and it's spotless.

Dex I can't get enough of the videos.

I don't know but, those marks in the cylenders looks like that aera got hot, and they are close to the freeze plugs. Your probably finished with this motor, so it don't matter. Just a thought.

Interesting box sitting under the stroker on the stand. 😎

That's my favorite color Cherokee. The maroon

Dex you are the man Thanks for all the vudeos

I’m loving the channel and the content man. Giving me some motivation to work on my j20 I’m ls swapping. I had a 96 zj in high school and all of my friends had or still have xjs over a decade afterwards. Wishing nothing but the best for you man.

I am in framing my 4.0. But now I have to put in cam bearings do to lose front cam (like your last video I saw about a week ago). I was hoping you would show how to install the cam bearing as I have never put them in. HAVE A GREAT DAY!

NOS cam and lifters are the only other choice 👍🏻🇦🇺.

Hey dex, I have had a wild hare for a while now, can't find anything if a jeep 4.0 can bolt up to a 1999 dodge dakota 5 speed transmission, I would very much appreciate it if you could do a video on it or something, cuz my 1999 dodge dakotas 318 has right at 200,000 miles on it and it's about shot and pure junk, but I think it would be very cool if I could fit one in and if there is a way I can keep a 4.0 fuel injected, I have already done measurements if the motor will fit. And it sure does, but pls if you can write back it would be awesome. Thanks.

Very interesting

That’s head looks pinned. I got one from AutoZone that was like that. I returned it and had mine rebuilt.

i had text you about aluminum valve cover for a 1999 grand cherokee you said you had older one that would fit with the correct valve cover wish you would show what had to be changed to put the older valve cover on the newer jeep

Just curious, what's your thoughts on the 1993 motors, pros and cons vs the newer ,say 96 and up engines

Been seeing that since 1998, when Jeep started using short skirt pistons.

No I don't replace wheel studs every time but I replace valve stems

What do you think about the head made by Edelbrock

Question, my head gasket failed between cylinders but never overheated! Does that cause the pistons to Crack like overheating?? Thanks in advance!

Please do a RHD build !

I was understanding that head bolt held their torque by stretching. Like a u-bolt. Is that incorrect. While selling parts in the class 8 truck industry a mechanic would never reuse a headbolt or a u-bolt

Was it welded n sand back to spec?

I’m suprized to hear y’all play jazz music but it cool

how many engine stands do you have???

Some parts of the country you don't need antifreeze so it had just water in it that would cause a lot of rust

Could not afford a 3 dollar thermostat, apparently. Will new antifreeze with anti rust clean up the water jacket? It’s pretty roached. I am just curious about how well it works. Dex, was that your wife that popped in to ask if you gaged those new rings? Great build Dex and Justin!

Any ideas? I'm supposed to pick up this "running" wj with 4.0. Owner says it fouls a spark plug on one cylinder every drive. Plug will make it 100 miles. Guys mechanic says it's got piston slap on that one cylinder.

Quick question for jeep bros. Sound like cam bearing failure? 00 4.0 cold start up and under light throttle theres a knock until its warmed up. Oil pressure sits at around 50 until warm drops to just above 20. 213k miles and no tick and knock is only audible in the cabin

SOME ENGINES HAVE STRETCH BOLTS THEY ARE JUNK SWAP THAT FOR STUDS ARP

I should have added "without a rebuild".

Is the missing Teflon the surprising secret?

My 01 is that color

Question. can i drop the crank out of a 4.0 with the transmission still bolted up?

Throw that p'of's in recycling bin and get the 91 though 95 Head these heads or thicker less cracking the 96 on are thinner and crack almost all the time.....

No dex. You dont get new studs every time you get new wheels. But everytime you rebuild an axle and get new wheel hubs what are you doing? Getting new wheel studs. Thats even less miles in between new studs than engine rebuilds. New heads bolts every time for me just cause they dont cost much. And then i have a whole stock of used ones incase they ever stop making parts.

I’m betting if anything is wrong it’s the #3

49:55 I’m dead

What is your web site.for junk yard ? Looking for a 5.2 or 5.9 motor and transmission and transfer case from a jeep CHEROKEE

Dexter’s laboratory

Im not a professional engine either. But i know when i see one.

Jeez stop leak more like stop flow, that head's coolant jacket is totally clogged up I'd be super surprised if the head isn't warped.

Build it

Were they running E85 in it 😂😂 that’s strange

Spray that idler with some oil

Nothing "spicy" about Sealed Power

Piston slap ? 0331 heads=trash

Gold plateme

$5K for that"rebuilt"engine???😂😂😂😂😂😂

$5G ?!?

yur tyre is flat

There ain’t nothing wrong with the way you talk

They stretch I replace anything I over headed or I refreshed twice rule of thum for me anyway