4.0 jeep Engine rebuild

4.0 Jeep engine assembly

[@thecitygunfightx]

It may be 3 years old but if you retitle this as 4.0 cam bearing swap, the views would quadruple. I literally cannot find anyone who doesn't just take it to a machine shop, maybe you are the machine shop! Furthermore if you just have videos specifically for cam bearings on all of your engines, a standalone video, titled correctly you would make money for sure! Like you said, everyone just goes to the machine shop, it's a skill I want to learn! I just wish you had **bored us** with the full install

[@bryanrudy3161]

Guys, as a professional mechanic for many years myself. After watching this video, I just wanna say this guy KNOWS what he's doing! very thorough with sound information and tips. Great video man!

[@Myvintageiron7512]

Thanks!

[@duster0066]

I'm just learning The Jeep 4.0 so I can't say on it. But this guy knows the Ford FE better than me. That gets my nod. As luck, good or bad, would have it my 95 ZJ started puking water out the tail pipe...head gasket, piston slap, and 235,000 miles say I need to learn 4.0 Jeeps now.

[@GrandMasterEmizo]

Finally, after watching so many bad "rebuilds" I find a person that knows what they're doing!

[@hmcalequin4854]

This is by far one of the VERY BEST videos I've seen on a Jeep 4.0L engine rebuild!!! I very much appreciate this guy, he very much knows what he is doing, knows what he is talking about & most importantly knows how to convey his knowledge to others in a way that ANYONE can understand. Keep up the good work guy!!! We need more automotive knowledge like this... I learn a lot by watching this guy!!!

[@No_Legos]

I can't believe how much information is crammed into this video, by far the best jeep engine video there is

[@Shanks344]

I have worked at an engine machine shop for the last 6 years and I would let you build me an engine any day. Nice work!

[@dfcvda]

I know nothing about engines i enjoyed this video and I`m in England and looking at an old 4.0 Jeep this week

[@brettb.7425]

I rebuilt one of these years ago and I absolutely love how simple these are.

[@philliptaylor5981]

This was by far the best video I've ever seen on an engine rebuild! The lighting, succinctness, explanation, pacing! Well done, man!

[@Myvintageiron7512]

Thanks

[@paul2466]

your method of checking yourself and making sure its right, nothing taken for granted...thats what impresses me so much...great work...great video...thank you

[@dateatorjr9671]

Best engine building videos out there. I actually feel like I could build an engine after watching.

[@Myvintageiron7512]

That's the idea Thanks

[@specforged5651]

Bottom end in those is a lot more stout than I imagined. Thanks for sharing.

[@jpcallan97225]

Thank you for the effort you put into making these 4.0 video. Like a previous commenter that wrote "Can't find the video of you stripping and cleaning the engine.", I too looked at your previous videos trying to find the video on prepping the engine for rebuild. If you never posted it, I hope you will. I'm on the verge of rebuilding a 4.0 in a 1996 ZJ Grand Cherokee with 188K miles.

[@filipnieb2491]

Prime example of how a motor related video should be introduced. In the garage, sittin on the bike, shorts, probably crocs on. Works gonna get done and you already trust who's doing it

[@oregon-castnblaster6664]

Great job, it would take me a year working on it everyday to rebuild the 6er in my jeep lol. Nice watching someone really good at it, thanks for the vid

[@kathyrudd4523]

Never watched a more informative and logical "how to" video. I have a '97 Grand Cherokee with 250k miles. It still runs like a Singer sewing machine but I'll be ready should it ever give up the ghost. Thanks for the information.

[@Myvintageiron7512]

Thanks

[@craigtimmons3468]

You must of had the same teacher I had when I was learning the trade back in the mid 70's, every step you preformed is how I was instructed, like you I prefer engine oil over assembly lube on the main and rod bearings for the same reason and also because I always prime the oil pump and system prior to start up which i believe just washes the lube out, but I still use assembly lube on the valve train components. Before assembly lube came about we just used a good quality bearing grease (I always used Wolf's Head (Red Bearing Grease) Brand) and still use Wolf's Head products today. Yes you are right special tools are that pricey. Im semi retired now and only do about 1/4 of the truck/ automotive work I use to do, and now have ventured off into the 2 cycle world of smaller engines to keep me occupied. Love the videos and thanks for your time.

[@zmxl1020]

Thabks for posting. Very relaxing video. You do things both the right way and tha easy way.

[@stephenhumphries7721]

Sir I am just about to embark on my first rebuild attempt 4.0. I was intrepid, but your presentations(s) has given me at least to confidence to START the project. I have watched all the other video’s but without doubt you are indeed a master at the subject matter for which I am sure we all thank you for taking the time and the pace that we can all follow. Well done sir, well done. BTW I would love to send you my existing engine for a rebuild as quite frankly I know it will be done properly. Regards, Steve

[@916fanatic1]

Outstanding as usual. You are so thorough.

[@jakster1952]

Love your videos brother. A labor of love...Thanks.

[@22trident45]

Great video. Well spoken and illustrated.

[@rickrebel489]

Great video thanks so much for documenting this process

[@paulrusso602]

thanks for the video, gonna come in handy on my jeep one day

[@jdparris8993]

Freshly cranked clean shaft. I'm digging it. 12:15

[@hallhouse5098]

Yeah I’ve watched these videos of his many times . Finally starting my rear down next week.

[@alexmolina7705]

Great video thanks, we still waiting for the rebuild kit and parts you using.

[@TheVintagetamiya]

All this work and cast pistons.Good video

[@aeoo371]

The 4.0 engine is a great engine. I want to build mine as a stroker with a supper charger .

[@travotheman5115]

You killed it man thanks

[@Auguste88]

Great work ethic, very informative, thanks!

[@doggytownfilms9585]

sr. thanks so much for make this video ...I need watch again and again for learn .I rebiuld my 4.0 jeep cherokee in 2 or 3 moths I gonig sure hi from tj mx

[@hockeyrules00]

I enjoyed this vid a lot I currently have a 99 4.0 Just wish I could afford the rebuild 😅

[@mohdsahid5079]

look nice without any rust

[@n8ux1963]

Love the 4.0 Jeep six. Any chance we might see a rebuilt of the venerable Ford 300 six?

[@jasonhauer7850]

What is the cost of a rebuild like that ?? Great video 👍 by the way you have a new sub today

[@tjhamer3]

good vid

[@Charlie_Foxtrot_]

I only clicked on the video because I thought Tom Hanks was rebuilding a 4.0.

[@Gunmetalbluejeeptjs]

Chase Frazee me too

[@dopeass791]

Same lol

[@DutchCherokeeXJ]

Sir, this truly is a great example of professional workmanship! One question though. I need to replace my expansion plugs in my 2001 XJ and just ordered a set of brass plugs made by Melling. I noticed you put in steel plugs. Was this done to keep the overall cost down or do you prefer steel plugs over brass? Thank you for this great video!

[@t54760]

@0:15 Where is the previous video that shows the acid tank, cylinders bored etc ?

[@raymondriley2137]

You look really familiar. I think you were one of my instructors at UTI?

[@jarinylund5168]

Great channel and excellent video as usual. Is it important to check crankshaft endplay now that bottom end is installed?

[@HoweDoYouDo1999]

I do love me a smooth inline 6 platform 😂👏

[@j.e.d.8065]

Thumbs up for not using plastigauge!

[@korydowell965]

What's wrong with that

[@BertMackFilm]

The one part you left out is that after you have installed the cam bearings one needs to shave their stache and change their shirt. It's just proper shop etiquette folks.

[@Uirigoy]

Great video as usual! Quick question, what do you use on your acid tank, I have a 460 that's very rusty on the lifter area and I would like to clean it

[@billydavis16]

Do you ever drill the oil hole bigger in the cam bearing after install, I seen it done on hot rod mag. Years ago.

[@ewilson0060]

Great vids. Decided to do a rebuild on my 2001 Grand Cherokee 4.0 after watching. Immediately came across an issue... I noticed the oil galleys in the block are offset (every other). When installing the main bearings, the oil galley gets partially covered up on every other main. I see that the block in the video is similar to mine (every other galley is offset). Did the bearings you use cover part of the galley? Sorry to bug ya. Trying to make some progress on this rebuild tonight. I tried calling the bearing mfg. (King) but they're closed tonight.

[@uhfnutbar1]

AMC designed an entirely new six-cylinder with a short stroke and seven main bearing crankshaft for 1964. Nash six-cylinder discontinued , the AMC produced the Nash six-cylinder from 1952 through 1965 :)

[@dre04mach]

Thanks for the bad news about that cam bearing tool, lol... I was wondering if there was a chance I could rebuild my motor on the cheap (spun bearing). I guess i am looking at a stroker shortblock afterall... Luckily they've come down enough in price that it makes more sense to buy a shortblock than to spend the time and money to rebuild one (unless you want something crazy out of the ordinary...)

[@MH-es9rn]

Perfect.

[@brandonhamby6778]

I’m getting ready to overhaul a 4.0 myself and I’m on a bit of a budget unfortunately. Could you tell me where you got the overhaul kit?

[@SunnyDaysRFun]

Hi, I'm all new to engine building, so I'm curious, how come you didn't use assembly grease for your crank shaft bearings and your cam?

[@jj4996]

Great work. Do you still build engines, where are you located?

[@dawoodk103]

Young Man, your video is par excellence in engine rebuild, God bless for your effort and passion. What is the name of your shop in Arizona ? I do not have a Facebook account, thanks.

[@yjman5130]

Where did you get that rebuild kit you are using?

[@jpcallan97225]

I am about to begin a rebuild of my wife's 1996 Jeep Grand Cherokee 4.0L due to worsening piston slap noise. Do you have a list of the parts you used and where you obtained them? I am especially interested in learning more about the improved torque cam shaft you selected. While she doesn't tow, we live in a very hilly area where more torque would be good to have.

[@richwalling6694]

What about getting some .001 under main bearings to get the clearances down to about .0025?

[@joshdoinggood8117]

What rebuild kit did you buy for jeep motor

[@johnmckamy6398]

do you use low tension rings for most engines these days?

[@scottdore132]

Not the ford 300 i6 video I was hoping for but close ;)

[@skylinefever]

Fel-pro gaskets make sense on many American engines, especially GM V6 engines, but I have heard that with Japanese engines, OEM is the absolute best way to do things.

[@Myvintageiron7512]

On late model stuff I agree

[@skylinefever]

Ah, thanks for your advice

[@elmarko9051]

The Fel-Pro aluminum-clad intake gaskets beat the pants off of the Mahle factory gaskets.

[@skully353]

Is there a reason you use a micrometer and gauge instead of plastigauge when installing the crank?

[@tswaff8106]

Do you have to put a new cam if you put new lifters in

[@prevost8686]

The 4.0 was a very torquey engine. It would however leak oil from the rear main area regardless of what you do. Other than external cylinder head cracks the oil leak issue was the #1 customer complaint. I don’t think Jeep ever came up with a fix for the problem.

[@r.weaver3769]

It would be nice to have a roller cam in this engine.

[@brucebello9892]

Great vid, thanks for reloading, the engine reminds me of a AMC unit, cheers

[@916fanatic1]

It is the AMC engine, When Jeep was bought the engine came along with the deal.

[@skylinefever]

When Chrysler acquired AMC, they took the 258 and modified it to create the Jeep 4.0 In fact, some people have done the following things with interchangeable parts: 1. You can use an AMC 258 crank as a stroker crank in a Jeep 4.0. I think, depending on the overbore, the engine is 4.6 or 4.7 liters in size. 2. You can use modify a 4.0 head to fit the AMC 258 and there is a horsepower boost by doing so.

[@dewholdingsllc1050]

I did not hear you say what cam you are using or the specs for it. Did you do head to know what cam to go with?

[@CajunWolffe]

I use an inside mic on the bearing bore and compare it to the crankshaft measurement.

[@tylerwilliams786]

Great videos getting ready to pull a 242 out of junkyard to rebuild for backup for my jeep I'm running now. Looking to get a good torque wrench like this. What size is yours 3/8s or 1/2,and brand. Thank you for all the info here in videos👍

[@Myvintageiron7512]

Craftstman 1/2 drive

[@jimclarke1108]

Hows the pontiac 6 OHC engine? ))

[@uhfnutbar1]

LOL i cringed when he said Chrysler 6 cylinder motor.... I`M big AMC fan :) The 4.0 engine was discontinued at the end of the 2006 model year, replaced in the redesigned 2007 JK Jeep Wrangler by Chrysler's 3.8 L OHV V6, which originated in the company's minivans.

[@skylinefever]

They stopped using it in the Grand Cherokee even earlier than that. They used the 3.7 SOHC as the replacement.

[@The__Canuck.]

technically it is a Chrysler motor, it was made to be introduced in 86 and to be put in the 87 model year jeeps, AMC was bought in 87 by Chrysler so being that its first year as a motor was in a Chrysler vehicle it was a Chrysler motor regardless of who built and engineered it. it spent its whole life under the Chrysler badge, Chrysler bought it and modified it and changed it.

[@The__Canuck.]

also your last sentence is copy and pasted from Wikipedia lol, anyone who has ever owned or bought a jeep for the 4.0 knows in which order it was introduced to vehicles and then discontinued, you don't need to copy and paste wiki to make it look like you know jeep.

[@MotoMUSEUM]

@Myvintageiron7512 I'm about to start rebuilding my 1992 4.0 AMC Jeep engine. Can you suggest a high-quality rebuild kit? It will get a supercharger at the end.

[@prevost8686]

Other than heads cracking and unstoppable rear seal area leaks , and exhaust manifold leaks the 4.0 was a reliable engine...

[@noahbones1221]

Wayne Swicegood head cracking is more of a 2000-2001 0331 Head thing

[@JoeJalopy]

Yes I bought a 2000 XJ withe the cracked head and rebuilt it using a Clearwater Cylinder Head (Florida)

[@richardknapp4251]

I have some people saying that I can put a loped up cam in my 2000 ecm xj. I haven been able to find anything but “a guy on Facebook said” If that is true would you know the size of a cam that would work on my ecm without needing reprogramming.

[@user-sy1xz9ko6u]

how much does a job like this cost ? my engine is making a bad ticking noise where the oil pan is

[@jhondoe6664]

Do you have to use a new cam.

[@michaelhoward8749]

Hello, loved your series about the 4.0 jeep engine rebuild. I wonder... could I hire you to build one for me? Thanks very much.

[@Myvintageiron7512]

no sorry I'm not doing customer work anymore

[@michaelhoward8749]

Boy sorry to hear that. Is there another builder that you could recommend? (anywhere in the US). I've had nothing but grief using rebuilds from the "mass" builders (i.e., Jasper, ATK, what have you). I've contacted some other specialty places... but they don't build regular 4.0's. Typically, just 4.6/4.7 strokers - which are way more horsepower & torque for my purposes. Thanks again. Love your vids.

[@leonardgilbreath9004]

I know what you mean about the price of the cam tool got mine from snap on over 30yrs ago and treat it with care.

[@rodneyturner6411]

We’re did u purchase the engine kit thanks

[@pj5870]

Thanks so much man. I just purchased a 89 XJ with 177K original miles. When the time comes, I want to rebuild the motor myself. What rebuild kit would you recommend?

[@michaelg6890]

In the video he says that he recommends felpro.

[@jerrytribble994]

Is their a stroker kit for ford 300 4.9?

[@Joe4USMC]

Man! That's a strange looking V8.

[@georgesantiago6005]

What is the compression ratio of the original 6 in line engine?

[@EisBlade]

Looks like I need to rebuild mine now. Does anyone have a parts list or maybe have a good site to buy a rebuild kit from? building for longevity. Not sure if an aftermarket cam = long lasting. Thanks.

[@jamesgraves6567]

I just don't know if I was building a race 340 or 360 ya maybe but wow no im not saying your wrong its just to much for even a budget rebuild re-ring get the head done and call it a day oh and yes the motor ran fine before it was torn down ...how far out was this motor to begin with im sorry I missed all the other vids

[@anthonietalarico6369]

Where did you order your rebuild kit?

[@shinriley]

Can't find the video of you stripping and cleaning the engine.

[@ronaldanderson9263]

One thing that bugs me, maybe you can enlighten me. With such exacting tolerances, I'm surprised that mic'ing the crank by eye relying on merely "make sure you're in the center of the crank circle" , It seems this is not a very exacting science. By now I would thing there would be a better way. Do you ever have doubts that you weren't on the "center of the circle"? - I mnot a mechanic at all. Very entertaining videos btw.

[@scct82]

How big is your garage?

[@colby.wriborg]

how much does just the motor weight??

[@sixt9stang]

Nobody ever says what do do if the tolerances are not within spec for the crank and bearings. Do you need to get the crank ground and then new resized bearings?

[@Myvintageiron7512]

Something is off either you have crank wear or the wrong bearings so you need to do some measuring to figure it out

[@ChickenNoodle0404]

How much does the engine weight?

[@Myvintageiron7512]

summit is the best

[@jamest.5001]

I have a question. on the 305 GMC six. what kind of fuel mileage do you think it would get. basically idling at 1000 revs? or I guess gph? gallons per hour. I have one . I'm thinking about using it for a generator. it would only need about 40 HP. but at first. I would only be spinning 6, 150amp alternators. but later I may add 1-2, 4000 watt ac generators. for house power. that way I can heat the house with the water. just like heating a car. other wise I'd be looking for a old air cooled vw engine. to spin all the alternators. since I plan on adding the ac generator. that is about 15 hp to spin it with heavy loads. come to think . I may need to run a smaller drive pulley. and spin 1500-1800 rpm. to spin 6, 150 amp alternators at 3K rpm. will take a lilbit of power. then the 4-5 kW generator. I may need that rpm to get the power. just think what engine is on 5000 watt generators. then all the alternators. I may get by with spinning them at 2,000 revs. at the alternator. spinning them faster takes more power. since its been sped up with pulley ratio. its like 6, 18000watt generators. needing about 6-7 HP each. so 36 to 48 hp for the alternators. then the generator needing 10-15 HP. that's pushing 60 HP. have you seen a dyno graph. of the old 305 GMC Sixer's? what rpm would they make 50-60 HP? great video. sorry I have missed them for the last lil while. thanks....

[@skylinefever]

I don't know the information about using it as a generator or irrigation pump. However, the website most likely to have the info is: 6066gmcguy.com/

[@Sea2Skyward]

What year is that 4.0

[@nickandraka9922]

3.5 Thou on the mains? doesn't that seem a little loose? specs for the 4.0 are 1 - 2.5 thousands.

[@chrissraceporting7055]

In regards to head gaskets which is better fel pro or victor reinz

[@Myvintageiron7512]

I like Felpro

[@dabuck08]

I have a jeep Cherokee Laredo and have a 4.0 engine. how much did it coast to rebuild the Engine?

[@Myvintageiron7512]

2500

[@DannerPlace]

There's supposed to be a reinforcing strap on the bearing caps!

[@lachlancarslake9654]

Only on certain years of the 4.0

[@JoeJalopy]

Yes my 2000 XJ 4L does have the reinforcing metal piece.