I Found A Surprising Secret During My Jeep 4.0 Rebuild

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

Рет қаралды 14,733

3 ай бұрын

Seems like rebuilding Jeep 4.0s has become just causal to me, But it seems like a certain year model is just known for being less reliable than others. Never really found out why, but I think I stumbled across a big issue worth investigating later on. Otherwise a video of me doing my regular 4.0 rebuild/refresh to resale. Hope you enjoy and can't wait to dig deeper on this idea!!

Пікірлер: 102

@conqueeftador225 3 ай бұрын

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.

@rudigeyser3939 3 ай бұрын

Im gonna start tomorrow. Did you do it in frame?

@conqueeftador225 3 ай бұрын

@rudigeyser3939 Yes, i did it in frame. The only thing i would have done differently was to remove the engine bay wiring harness completely

@Gaston.- Ай бұрын

@@conqueeftador225nice and the wiring harness isn’t hard to remove either. I did it in under two hours without removing the dash.

@paulanderson388 3 ай бұрын

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.

@caseyb65 3 ай бұрын

I have beat the absolute brakes off of mine consistently, done only oil changes and it’s got 270🤣

@KarstRats 3 ай бұрын

At least 200k? Lollll. Try triple that.granted i did rebuild with the heavy skirt pistons

@Gaston.- Ай бұрын

They’re great. Honestly 200K miles is entry level for an XJ.

@John-d7p 13 күн бұрын

With good maintenance, 200K is an easy mark - even with chronic piston slap. I would classify these engines as 300K'ers with no rebuild, just normal external parts replacement as needed. Move over Volvo. They are as good as the 300 Ford. Not as strong, but just as long-lived.

@paulanderson388 12 күн бұрын

The Ford 4.9 liter, 300 cubic inch 6 cylinder is the gold standard for durability, dependability. and longevity. The Jeep 4.0 is a close second.

@MoBCommunity 3 ай бұрын

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.

@Dmowery5036 3 ай бұрын

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.

@johnhbenn Күн бұрын

You forgot the most important safety precaution... the safety squint

@tjshort9124 3 ай бұрын

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

@benmudn 3 ай бұрын

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.

@genobrn8743 22 күн бұрын

Love your videos and forensics style👍🏿. I bought my mother in law’s 01 GC , 4.0L with 49k, all of her orig miles.- I meticulously maintained it with oil changes every 3-4k. I enjoyed it as my daily, again meticulously maintained. At 158k suddenly developed a rap/slap toward the front block. I dropped the pan a found a silver mine- both #1 skirts sheared and shattered. Got a Jasper($3000) and my buddy’s garage installed it. Ran well for a while. Early ion got low oil pressure intermittent reading and then between 25-27k started to consume coolant with all the classic symptoms. 3yr/100k warranty. May 2024 another Jasper eng- with NOT a penny out my pocket. During the 27k miles- 9 full Syn oil changes- with Blackstone Lab analyses on all oil changes. Copper, lead etc levels increasing with each change and the last 3 analyses Phos/coolant contamination became obvious. The forensics: well of course cracked head and blocked oil return passages. All from the #1 engine reman Co. in the US- JASPER👎🏿👎🏿 Thank you, love your Channel

@TheMainLead 3 ай бұрын

The stitch weld was very cool. Thanks for sharing

@bobbystalder3323 3 ай бұрын

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 👍👍

@NickMango 3 ай бұрын

It does sort of look like that technique: www.locknstitch.com/pdf/cruise_ship_repair_final_report_2011_new.pdf

@justinchandler5436 3 ай бұрын

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 KZfaq videos

@TheMainLead 3 ай бұрын

Justin won’t let him play 4.7s they’re junk

@randyhenslee1206 2 ай бұрын

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

@CKILBY-zu7fq 3 ай бұрын

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.

@tylerworkman386 3 ай бұрын

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.

@kenslagg5304 3 ай бұрын

Dex I can't get enough of the videos.

@dalebailey1844 Ай бұрын

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!

@jaidenaxtell9366 3 ай бұрын

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.

@aefgshwrthwrhnwrhnbw 3 ай бұрын

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

@Tater4200 20 күн бұрын

Btw those coolant ports where clogged up good. Thats what that stop leak crap does for ya

@yosef79 3 ай бұрын

Interesting box sitting under the stroker on the stand. 😎

@edwinpagan4705 3 ай бұрын

Dex you are the man Thanks for all the vudeos

@forreststrong797 3 ай бұрын

That's my favorite color Cherokee. The maroon

@brianandglendaharkin9457 3 ай бұрын

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

@oldxj 3 ай бұрын

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

@DependableAutoTruck 3 ай бұрын

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

@timothyproksch2915 3 ай бұрын

Very interesting

@j.finesseflights1403 3 ай бұрын

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

@shannondillon3369 3 ай бұрын

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

@jakehanneman6956 3 ай бұрын

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

@nickmcminn2137 3 ай бұрын

TTY bolts should never be reused

@Tater4200 20 күн бұрын

Hey that head has been repaired with those taperd pins. Then they ground em flat.

@subparinternet4014 3 ай бұрын

Please do a RHD build !

@jamesgeorge4874 2 ай бұрын

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

@edwarddavis507 3 ай бұрын

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!

@Skiridr22 3 ай бұрын

Was it welded n sand back to spec?

@georgemorales7958 3 ай бұрын

What do you think about the head made by Edelbrock

@timothyproksch2915 3 ай бұрын

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

@mackelby1 3 ай бұрын

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

@Wooden_Crate 3 ай бұрын

how many engine stands do you have???

@jerrywhalen2100 3 ай бұрын

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

@incogrhino0101 24 күн бұрын

#ganggang

@boostedzjadventurevlogs4121 3 ай бұрын

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.

@chineseempanada420 3 ай бұрын

Find out if it’s fuel, oil, water. If you finds whats fouling it then you’ll know what’s needed to fix it

@Tater4200 20 күн бұрын

Apparently your supposed to change the tty head bolts. But ive reused them lol

@steveesposito 3 ай бұрын

Is the missing Teflon the surprising secret?

@eagleone5456 3 ай бұрын

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

@thisisyourcaptainspeaking2259 3 ай бұрын

20 psi hot at idle is pretty good for a 200,00 mile+ motor, your knock sound could be anything from an exhaust pipe banging against the frame or against the pipe hanger while driving, to a cracked. piston skirt. All new bearings and pistons and probably minimum overbore depending on how much distortion the cylinder walls have. Use a torque plate while boring if you want a 500,000 mile engine. I'm not a jeep 4.0 guru.

@pisstoffcat5136 3 ай бұрын

Try Lucas oil stabilizer , mine was going to 18psi hot, started running Lucas and got 27-35psi hot ,

@thisisyourcaptainspeaking2259 3 ай бұрын

@@pisstoffcat5136 10psi for every 1,000 rpm is generally adequate, according to widespread rule of thumb (not 4.0 specific). My Buick for instance, idles at 10psi hot on a good day and drops as low as 5psi on the hottest of days, it's normal for this motor. If oil pressure jumps right back up with rpm, this is a good indicator that you want to see.

@pisstoffcat5136 3 ай бұрын

@@thisisyourcaptainspeaking2259 I had my jeep 4.0 before this one would sit at 15psi hot and one nite I heard a knock pulling off from a few stop 🛑 sign. Looked at the oil gauge was sitting at 12 psi and a slight knock , limped her home dropped the oil pan and the rod bearings were showing brass, I polished the crank thru some new bearings and a high volume oil pump , had 45 psi cold and 29 hot ,put 50k on it before I wrecked it

@thisisyourcaptainspeaking2259 3 ай бұрын

@@pisstoffcat5136 Gotcha. One question, was the oil pressure rock-steady, just low? I've noticed when a bearing spins the mechanical pressure gauge needle vibrates as the crank turns. This is because oiling leaks occur more in one crank position than another.

@KarstRats 3 ай бұрын

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.

@damionrichter 3 ай бұрын

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

@brysonshires9742 3 ай бұрын

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

@pisstoffcat5136 3 ай бұрын

Probably not, definitely not on a manual, on a automatic you would have to move the trans back to get the flex plate and that other big plate between block and transmission, I think it could be done but would be way easier to just pull the motor out and do it on a stand.

@brysonshires9742 3 ай бұрын

@@pisstoffcat5136I was planning on pulling the engine, it's just that I don't want to pull one in the junkyard when I only need the bottom end. I'm already thinking I'll have to take the head off to get pistons out that I won't even use most likely

@jeremyhanna3852 3 ай бұрын

I don't see why not but why

@pisstoffcat5136 3 ай бұрын

@@jeremyhanna3852 exactly, 3 times the work.

@jeremyhanna3852 3 ай бұрын

@pisstoffcat5136 2 wks ago I went to pick a part for a starter came home with engine trans and tcase cause they ain't making oem parts anymore

@Skiridr22 3 ай бұрын

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

@kevinclevenger8741 3 ай бұрын

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

@boostedzjadventurevlogs4121 3 ай бұрын

Come to Illinois and pick up. I'll give you either but not both. $1000.

@boostedzjadventurevlogs4121 3 ай бұрын

5.9+46re or 5.2 44re. Both 1998.

@randomritchie 3 ай бұрын

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.

@haroldpetri1495 Ай бұрын

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.....