They went from this to this🤦‍♂️

[@basshunter428]

I don't need any more info. I own a 98 Wrangler (4.0L) and after many years of working on it I can agree 100%! Jeep hates everyone! 😂

[@analogueoverdigital929]

Why is that? And also why do their engines run naturally hot. Like super hot?

[@basshunter428]

@analogueoverdigital929 These vehicles were designed to severely limit the owner (and outside shops for that matter) from making repairs. I say this because even in the 90s there was a "special" scanner that only Jeep techs had access to and only they could run certain diagnostic tests. Jeep wanted the owner in their shop (as much as possible). And in the case of the TJ, the frames were designed to rot out in ten years if in a snow/ice environment because they held the water/salt and didn't drain! The engines run hot by design, but that doesn't affect durability. The 4.0s frequently outlast the chassis. They are real tough.

[@malakihayes9774]

Facts

[@tylerdunn6578]

@@analogueoverdigital929yeah I’ve often wondered why they run so hot so I changed thermostat and started running virgin antifreeze and believe it or not it runs ten degrees cooler

[@ronwallace6273]

all car companies have had 100 years to make a perfect engine did you ever notice they are always putting out new engines new designs new every couple years. chevy made a 350 then said this works to good lets make the weakest engine we can a 305 , now today aluminum birdnest bs I hate new junk

[@paulberkland5700]

4.0 is not based on the 2.5. The 4.0 is a slightly improved version of the original AMC inline 6.....232/258. They are one of the best inline 6 cylinder engines ever produced

[@PaulShaw-ex7ri]

Exactly . The 2.5 was based from the IRON DUKE.

[@JosephCowen-fz8vj]

Correct my friend it was an AMC six

[@dualsportrider3221]

The 2.5l jeep is def not raised on gm engine. It's a 4.0l missing 2 middles cyl. 4.0l has its history from 258 family, heads swap to fuel inj cj

[@ligitstrawberry]

The ford 300

[@Hqwef]

Definitely one of the best. The 2.5 was completely junk tho

[@inteligentvtec]

Many 4 liter jeep engines with over 300,000 miles that have never had the valve cover off. Change your oil often and don't overheat it and it will run forever.

[@will7its]

The chevy 6's have removable side plates so you can access them and have been ohv since like 1915.....

[@dmelson7502]

And that's why it's sick that we still love our Jeeps. It's a dysfunctional relationship. See you out in the hills

[@alexandrebrundula563]

They knew we'd be doing a few headgaskets. Just gotta do em at the same time😂

[@georgehill3528]

If you don't run the 4.0 without oil or coolant you never take it apart. ❤ 200,000 is pretty good push rod engineering 🎉

[@paulberkland5700]

@@georgehill3528 only 200k? Should've changed the oil once or twice.....lol

[@KC9UDX]

No kidding. 300k is more like it.

[@georgehill3528]

@KC9UDX est engines of the 20th century list.

[@derekjohnson5346]

I got 260k on my 99

[@KC9UDX]

@@derekjohnson5346 my wife's 00 is 400 or so. (The drivetrain is from a 91 that had well over 300k when the odometer quit working :) )

[@Anthony-vq1wn]

That's because Automotive engineers are a special kind of jerk whose sole purpose in life is to make automotive technicians jobs as tough as possible.

[@chrisgodinez2568]

This is why the Ford 300 4.9 is a superior design. Not to mention a gear drive timing set.

[@Superstitiousobserver]

Hands down best engine ford ever made

[@danhammond8406]

​@Superstitiouthats not saying much. Just means you need a tow back home at the end of the block instead of the end of the driveway.

[@Charlesvonschwenke]

Yeahh I really wish you could remove the lifters without removing the head, it’s the main reason I’ve hesitated on installing a comp cam in mine

[@jamesmatthews2966]

That 4.0 is a strong engine had one in a amc and it would roll very fast

[@Lakeman3211]

My 85 Cherokee was built with the GM 2.8 v6, and a Chrysler 3 speed automatic…very piggy…I still have the beast…

[@paulberkland5700]

@@Lakeman3211 do a full meal deal on that 2.8, then get a speed

[@paulberkland5700]

@@Lakeman3211 5 speed

[@TalesoftheScales]

You should try machining them out and so they clear easier and make it an easier repair for yourself in the future.

[@Chevyguy-1984]

I don’t think the design of the casting would allow that

[@JF32304]

I was just wondering if this could be done. I'm surprised no one has made an aftermarket head for it.

[@123ABC-Machine-Basics]

Love the 2.5 & the 4.0 !

[@BrandonZ55XJ]

Gotta love these engineers... I think I cuss them out during the day more than anything or anyone else!!!

[@derekcrooks7669]

@dexjs you can do the lifters without pulling the head, but you’d have to pull the oil pan instead. I did my lifters in the 4.0 from the bottom.

[@Tpbmods]

I dont even want to know how this is possible.

[@DB-yj3qc]

I just hope you're not a dentist too.... 😮

[@JayS-w2c]

😂😂😂​@@DB-yj3qc

[@frankhuddleston6548]

That's why I like the 4.9 Ford. They gave you a damn lifter pan

[@swiftyuras1]

The reason I hated the 4.0 was because of the time my buddy blew his exhaust manifold apart. The bolts that held the exhaust also held the intake. Granted, i was 15 trying to help him fix it. As soon as we got one thing lined up, something else would fall or mis-allign by just enough...

[@JDeer-sw4qn]

I never comment on much here. But thought I’d give my 2 cents. I own a 96 and 99 GC. Can confirm the inline 6 4.0 is one of the best engines. Both of mine have 250,000 miles on them and run like sewing machines. As a former mechanic I always thought jeeps were junk. After I bought my first Jeep I realized that’s not always correct. Typically bad owners that don’t do oil changes, maintenance. There is a reason they stopped making this platform. The manufacturer’s don’t make money off equipment that doesn’t break/die. But yes pulling the head to change lifters is not so great.

[@DependableAutoTruck]

is there room to use die grinder to open them up to replace

[@aceleradosperformance]

Ford 4.9 inline 6 is the best inline motor They put a lifter cover on the side of the block to get to the lifters

[@BFMB69]

Cummins is worse for lifters/tappet removal. Many cam in block motors I have worked on are the same. The 4.0l motor is a pretty solid unit. Only issues I have ever had was cam sensor drive gear failure that resulted in oil starvation. Lack of maintenance and over rev downshifting too soon.

[@irchrisb]

Small engine guy here. I feel your pain... ish. Kohler singles use lifters from an SBC, but you have to pull the head to replace them. Ugh.

[@elirenigar9357]

Can you mill the 4.0 head out for clearance? Or was this space used for larger cooling passages to compensate for the larger engine.

[@f.chrisliuzzo7889]

AMC 258 cu in (4.2 L) inline six-cylinder: This engine was available in the Jeep Cherokee from 1971 to 1990 and produced 110 horsepower.

[@wewillsurviveone]

Same thing when you go from a small block Chevy to the LS1 platform. You could pull the intake, swap the lifters on a SBC but have to pull the heads on the LS1 on. I get it makes the block stronger on them but this Jeep thing doesn't seem like it makes much sense

[@HowardClifton-sh9lx]

I went through the same thing on mine turn the motor upside down on engine stand you can loosen the rocker arms take the push rods out the lifters will fall down out of the way Paula cam out and you can get the Letters Out put the new ones in put a new cam in and you're good to go

[@islandtrooper4x432]

4.0L is based off the AMC Rambler engine. They just left it the way it was.

[@kevin2960]

Someone already said it but the 4.0 is based on the AMC in line 6 that goes way back to the late 50s.

[@allennewman632]

Pretty sure the first motor for it was the gm 2.8. Which sucked

[@zanehayes4380]

No, it was introduced with both the 2.5, and the 2.8.

[@bachtomin213]

So, is swapping in a Ford 300 into a Jeep a thing? Or is fighting crap design more important than going to something easier to work on?

[@martintodd1971]

The 4.0 is a great engine. Maybe you can grind it out enough yourself.

[@NunyaBizness-p8y]

Realistically, if one of these engines is talking to you enough tha you need to replace the lifters, you need to do a top end overhaul anyway. Replacing lifters and pushrods is just a bandaid outside of very soecific circumstances. Do it right the first time.

[@stevenhaneklaus8087]

Never been able to pull the lifters through any head on any engine ever and I've been a mechanic all of my life. The 4.0 is not based off of the 2.5, it was based off of the AMC straight 6

[@jessprouse6982]

2.5 is the Pontiac Iron Duke. 4.0 Jeep engine is based on the 4.2 AMC engine. Just ask me about 2.5 liter camshaft composite gears.

[@keithwright1642]

All I can say is if I am swapping lifters, I’m going to pull the head for inspection and swap out the head gasket anyway. I work on my own stuff, so I’m not worried about how long it takes- I will do it right.

[@allq7138]

Wait, there's no lifter covers I guess I thought it would have lifted covers like a ford 300 Which is the Motor I'm more familiar with since it's in my pickup.

[@chrisfegan3475]

4.0 is one of the easiest motors to work on. Might as well replace the head gasket anyway.

[@jarredivey-z5s]

Yesss!!! Can the push rod holes be made large enough (aftermarket or drill?) I rum into this with a valve job the guy didn't torque the rocker arms they fell off in the valve cover.. Used a magnet reset the lifters and got lucky it all worked out til it had a fire.. Still working on that it's a mess of wires I need a pre 96 harness.. u got one??

[@robertseely7084]

4.0 is a good inline six, slant six even better!

[@umpatas5468]

A good machine shop can fix that. And make guide inserts for the push rods. That 4.0 is one of the best lasting engines ever made. Just jeep owners have issues with checking and changing oil.😂

[@bobhalstead1879]

The gm ls motors have to have the heads removed to replace the lifters also.how often do you need to replace the lifters.

[@TheDeadwood11]

The 4.2 was around a long time before that. Look at your 70s jeep AMC vehicles.

[@nbowling10trio]

Can't make it too good😂

[@matthewgaul8197]

Ford 300 has a cover on the driver side for the lifters

[@boost1728]

I knew Jeep hated me long before that. As soon as I went to remove the intake and exhaust manifolds it was CLEAR AS DAY. What a nightmare

[@speed284504]

Wasn't the 4.0 an AMC product?

[@JosephCowen-fz8vj]

Yes he's a dud , it was an AMC six from the 1960s

[@marioarchuleta8723]

I didnt need to know threw the 3 generations engines but i loved it all

[@robertpolkamp]

Did the 4.2 have a better design for lifter replacement?

[@TheDeadwood11]

4.0 and 4.2 are very similar. You can take a 4.0 head close a cpl coolant ports and put it on a 4.2 and gain 100 hp with port an polish. 4.2 was AMC I believe. However most American motors lifters are installed before the heads.

[@MrChevelle83]

in my opinion. by the time a 4.0 wears a cam and lifters out. the whole thing probably needs rebuild. im guessing 300k miles on the cam. ive seen these engines running perfect with nearly 300k.

[@glennschlorf1285]

4.0L was not based on the 2.5... It was based on the Ambassador 232/258

[@FULLradiator]

Cant pull lifter thru head of 4.2 either.... Thats why your 4.3 vortec swap with marine intake manifold to accept carb

[@johnskinner1863]

Old school engineer, versus new yung engineer

[@branndonbowman]

That’s wild!!

[@bernisrogerson9224]

Well boys Im getting out the drill😂😅 New and improved 4.0l heads coming soon.

[@chriskennedy8525]

Is that the later craplar heads for obd1-2. My 88 waggy rinex head has the bigger lifter holes. Did the lifters year before last and didn't take off the head.

[@Donald-qc1rr]

The 4.0 is not based on a 2.5 it's an AMC design from way back called the 258 and they are one of the most dependable engines ever made.

[@maxfritz4813]

Do you think it would be technically possible to bore out the hole to the correct size to fit the lifters through or would it hidden oil passage or coolant Passage

[@rayhogan796]

My 4.0 went for 330,000 without ever having the head off. Sold it running then, probably still running around sonewhere

[@jeepsblackpowderandlights4305]

what about the 4.2 ? from amc

[@floridagunrat1625]

That's what I was wondering, too!

[@Nathan-u2b1w]

Same as the 4.0L just a different crank and rods. You can actually swap the crank from AMC 242 into a jeep block and boom you have a 4.2L stroker motor

[@MrKotel007]

It is possible to change the lifter from bottom? (Including changing camshaft) I have rebuild the head and leave the old lifter's (my bad) and i don't want to put down the head again. I do it when the engine is in chasi and it's he'll of a pain to unscrew and rescrew the exhaust bolts.

[@imchris5000]

yes

[@abelaruca3951]

That makes the engine stronger

[@ftlbs11]

Pretty sure the 4.0's roots are in the old 258 from many years ago. It's not the inly engine designed that way either.

[@coryvinson8343]

And that's how a head gasket turns into a valve job and cam that turns into a 4.7 stroker....and I'm broke

[@williamwarner3982]

😂😂😂😂😂😂 the 4.0 was based on the 4.2. The 4 banger was its own. There was a 2.8 Buick V6. But it was a joke.

[@ericlassiter533]

Wasn’t the original 2.5 a Pontiac iron duke?

[@doughaner2709]

I knew my 2.5 was superior.😂

[@joanstehlik235]

My only issue is the way the exhaust and intake manifolds mount to the head.😢

[@lamontbest1693]

Inline six was around long before the four cylinder.

[@Dmowery5036]

Isn’t that some crap.... didn’t know that

[@goneforever4659]

They made the 4.2 first then the 4.0 which was fuel injected

[@Hqwef]

It's because the 4.0 was bullet your not supposed to rebuild them. 😂

[@bencarpenter9107]

That’s because GM design the 2.5

[@rocksannexj3195]

GM 2.5 Ironduke is not the same 2.5 XJs used. AMC designed their own 2.5. Only similarities are the displacement and cylinder count.

[@globalexcursion]

What about the 4.2 head ?

[@Wiz-kidddd]

Yep been there done that 😅

[@vanpenguin22]

Would you cut into the water jacket or an oil gallery if you were to bore those out?😅

[@twobalcain]

Thats a very common deal.

[@Milkeywhey]

A fool and his money go separate ways.

[@dan27052]

“Just to prove how much jeep hates you” instantly knocks a chunk of dirt into the cylinder… lol

[@DE-vf7gy]

Am I the only one who noticed that hunk of debris falling in the hole?

[@malakihayes9774]

This why i take my time remove the head and reshape the ports so i dont have to take it off again

[@thelonewrangler1008]

The hole is never too small

[@jamescrouch740]

If it ain't an old Jeep made by Amc with the 304 v8 in it then i don't want it!!!!

[@Classic-lips]

Isn't the 4.0 based on a Ford straight 6 from the 70s or earlier?

[@Fixerjak]

The original inline 6 was not a 4.0 and it was designed by a French company. And Jeep used that for years.

[@jimbertrand1429]

My rule of design. It must be REPAIRABLE using as little time and effot as possible.

[@bobbylewis9587]

I'm sure they saved $1 per hole and a 100K moters. So they saved 600K. But you are still paying for it😂

[@ae111black]

Jeep still doing this today with all their everything…..

[@jamesgeorge4874]

Never have seen a lifter / cam failure in 33 years as a tech, but plenty of cracked hesds...

[@JayS-w2c]

You dropped something down the lifter opening in the first motor.

[@EliAlexanderClark]

They could’ve given you a V8 and two heads, two gaskets, two exhaust manifolds… They only hate you a little bit.

[@ethank1]

could u shave metal away to make it fit?

[@michaelbishop242]

get the carbide burr out and make a video

[@deadspeed6679]

😂 I got one ticking I might just do it

[@MrMrsregor]

YES !! But, the cleaning up all of the metal bits afterwards is the hard part 😂

[@deadspeed6679]

@@MrMrsregor shop vac it is

[@FoxInABoxLT]

​@@MrMrsregoryou'll have to pull the head once to drill out the holes but then you're hunky dory

[@MUUKOW3]

Well I guess by the time it may need a lifter it would be time to freshen it up anyways! Its like its a high wear item.

[@sammolloy1]

This was a tradition since the 199 in what, 1964? I don’t know why. I’m told that to adjust the valves you buy pushrods in different lengths.

[@goodvibes0101]

Hate engineering that makes our life harder not easier

[@andrewjohnson7103]

Wrong! The 4 cylinder was built from the 6 cylinder.

[@mudboysjeeps92]

Wait what if you milled them holes ???

[@1windozesuk]

I wish the HEMI could do that!

[@leewilliamson3424]

🤨 that sucks they should have never taken away the side cover