How To Replace Engine Main Bearings.

In this video we are replacing main and thrust bearings on a Diesel Cat 3406 E, but the principles are the same on most engines. Thanks for watching. @AdeptApe on Venmo or [e-mail] on PayPal for donations, thank you so much for supporting the channel!
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[@cryoine7194]

idk but this video was oddly relaxing to have play in the background while i looked at my main bearings

[@robertovillalon2841]

Thank you!!! I love how concise this video is!

[@chele-chele]

Merry Christmas and thanks for the great tips, always a pleasure to learn from a master.

[@aliahmadbilal666]

Thank you Josh. I keep learning from you .

[@deleteduser3749]

Great video. I didn't know how to change bearings on an assembled motor. This makes it look easy. Merry Christmas.

[@ij632]

Including the cam shaft inspection was icing on the cake 👌

[@jamesscott1932]

Merry Christmas! This video is nominated for “Joshua’s Best Video” of 2022.

[@briant7067]

Thank you for post! Most appreciated! Have a great Christmas!

[@michaelschweizer4772]

Thanks for all the great videos.

[@kerrygleeson4409]

Thanks for sharing your knowledge Josh always very interesting

[@chrissalomon5271]

Awesome video, thank you so much for all of your content.

[@nothingtoitdm6191]

After a year diesel School in Vo-Tech, swapping main and rod bearings of an in frame engine rebuild was one of my more fond memories

[@RLeoSC]

Excellent video, well explained step by step and great visual

[@marktiitto7616]

Slid more than few sets of bearing in . Y'all done good From an old wrencher

[@danielvrana9444]

Merry Christmas too you and your family. Let’s have great new year!!!

[@styleauto1025]

Very Clean explanation thanks

[@giggiddy]

Thanks for the nice, long, detailed video. And, often dust particles look more pronounced when being recorded using a light. In other words, it always looks worse than it really is.. Your quality is impressive! Merry Christmas sir!

[@peteengard9966]

I have used Lubriplate 105 for reassembly for more than 50 years. Dissolves almost instantly in warm oil. My roll in/out tools are short bolts with the heads ground down.

[@jcm78]

My bearing procedure is almost identical to yours. I use a long brass drift to push the bearings in instead of the screwdriver. Used to torque turn with an impact but we acquired a raptor pneumatic torque multiplier at work. That thing is awesome! Especially with the new Detroits that have to be angled 90 degreesX2 and Cummins head bolts that are 300 ft lbs + 90 degrees. Prior to the raptor we had to use a 1” impact gun when angling the ISX head bolts. I can’t say enough about the raptor, it’s a great piece of equipment!

[@red6423]

THANKS BROSKI. MERRY CHRISTMAS 🎅 🎄

[@madatlas3806]

I was always taught that the bearing tab kept them from spinning. Guess ya learn more than you thought you would with Adept Ape :)

[@oldpete3153]

Inframed dozens of Cummins 855's in the 60's and 70's...all the mains then were torqued to 300 ft lbs then lock plate tabs folded over. I used a 1/4 inch clevice pin to extrate the tuff ones instead of a heel bar. Usually dropped all caps except #2 and #6 ...rolled in 1-3-4-5-7 then after that #2 and #7 and the thrusts were on the #7 ...you need to experience torquing a full set of mains laying on a creeper to 300 ft lbs. Lol

[@cwj9202]

I found dropping and replacing 1 through 4 main bearings as a group, then installing those main caps, and then dropping and replacing 5 through 7 allowed very easy installation of the upper main bearings.

[@1979kw]

I'm working on a 1980 300 big cam right now, not alot of fun

[@rsmith3033]

i’ve done several cummins my self an i used a brass rivet on tha hard ones,put it n tha oil hole n tha crank an bar it around

[@badgerpa9]

Merry Christmas to you and your family Josh. Stay safe and healthy.

[@AdeptApe]

Thank you Badger. Merry Christmas to you.

[@raycollington4310]

Great when an engine is this traditional configuration. More engines seem to have split blocks now that incorporate lower main bearings in the casing, thus screwing any in-frame bearing replacement. MAN & Kubota to name a couple. Thanks for the great video, love the use of the air brake diaphragms.

[@dmitryhwguy1646]

Iveco Cursor too((((

[@XcoolcoolbeansbeansX]

It’s purposeful, as it’s functionally much stronger to use a split block/bed-plate design.

[@tonydiesel3444]

Kubota has a modular crank That is inserted into the Block in the round mains

[@scrotiemcboogerballs1981]

Thanks for sharing merry Christmas

[@RJ9mech]

Congrats on 200k! Merry Christmas!

[@AdeptApe]

Thank you RJ.

[@michaellea6435]

Great video...Cat for life 😊

[@damondavis1866]

Thank you have a great holiday

[@expatconn7242]

Always good to learn.. ty Merry Christmas

[@Mark-vu8ct]

I just had this done on my C15 Accert. They rolled in the rod and main bearings. I had an oil filter gasket fail and I lost 8 gallons of oil in a very short amount of time. No critical oil pressure warnings but I wanted to be sure. The bearings were very close to spinning according to the CAT folks when they pulled the #2 and #5 caps. I'm glad we didn't just fill her back up based on the lack of critical oil pressure warnings.

[@OscarFlores-gl8gn]

Awesome work awesome teacher Mains I’m coming for you

[@kodykj2112]

Show em who's boss

[@markiefufu]

I'm doing an inframe on a Cummins 8.3. Wasn't planning on replacing the mains, but after seeing your video, I see how easy it is. Just hope I don't have to torque up to 200-300 ft-lbs as all my 3/4 stuff is sockets, a rachet, and 3ft breaker bar. No impact larger than 1/2.

[@foxyota86]

Thanks for the videos. I own a fleet of 8 trucks. Once I get my big shop built I hope to start rebuilding my own cat engines. I learn a lot from your videos. Keep them coming please.

[@shairafzalkhan3106]

I am also planning the same. can we so it together. where are u located. if u r interested. Reply

[@hillman2131]

top notch as usual happy christmas

[@larrytalley117]

Ok, I haven’t replaced any bearings for many years, but I have been told I’ve lost my bearings, and then there’s the issue now that I’m older of the wrench in my back. 😊. Josh, I hope you and your family have had a wonderful Christmas and can look forward to a happy and healthy new year.

[@AdeptApe]

Hi Larry. Merry Christmas to you abd yours as well.

[@patrickwendling6759]

Thank you for your knowledge and video's USA 🇺🇸

[@victorhernandez769]

Thank you for the video

[@josephpuchel6497]

Excellent video tutorial. I take it you wash down engine downward after pulling sleeves then once more from bottom prior to bearing installs. Nice camera footage. Merry Christmas

[@AdeptApe]

I'll brake clean the liner bores and the bearing journals before installation of anything.

[@michaeldunagan8268]

@@AdeptApe I started using lint-free cloths last week when I was doing valve-cover gaskets on my 1999 Toyota Solara. It could be paranoia, but I just want to be super careful not to have leaks. I purchased them from advance Auto Parts which is an auto parts chain here around the Chicago area. They do carry some truck parts like headlight bulbs and I've used them for just that.

[@big_daddy_pp]

Good job, quality video

[@davidthelander1299]

Thanks! I’m just about to do this to my Cummins N14

[@mattthompsom2056]

I use that roll out trick on John Deere’s, end up just grinding a small bolt down it works great

[@boatbutch]

My old man used to drive a cabover kenworth with a detroit. Coolant ate his mains and he did this job one and only time on the road in the cold cold north country of NY State.

[@petermolnar8667]

Props for not throwing away good oil 👍

[@intimid8rkid]

congratulations on 200k

[@AdeptApe]

Thanks for noticing, thinking of doing a live stream about it, not sure yet.

[@thebiggsy]

Great video cheers

[@roadserviceinc]

i liked your video. i was told by an old mechanic to oil the back side of bearings as it promotes heat transfer. i have been working on 2 cycle Detroit for 40 years and cat only 20 and still learning.

[@neilstuart9727]

Changes clearance

[@wally7856]

Whether you oil it or not, oil will find its way in there all by itself. There is no O-rings stopping it. I've never taken a bearing off a cap that wasn't saturated with oil on the backside.

[@rdallas81]

​@@wally7856true.

[@BigZack13]

I use an old main bearing, that I bent an inch into one side as a handle, and use it to push the bearing out. But I'll have to try that oil gally trick on my next in-frame

[@javierrflores]

Great video

[@zayin123]

Excellent, thanks.

[@nickayivor8432]

PRODIGY Adept Ape My teacher Adept Ape Merry Christmas 🎅 🎄 🤶 Adept Ape Thanks for sharing your knowledge with us. God has bless you thank you PRODIGY Adept Ape From Nick Ayivor from London England UK 🇬🇧

[@AdeptApe]

Thank you Nick.

[@timwhiskerd2133]

I liked this before watching .. :-)

[@tonyking9235]

MERRY CHRISTMAS TO YOU AND YOUR FAMILY

[@johncholmes643]

That 5EK looks pretty good

[@glenparks5175]

Thank u for this video, now I think I can remove my pan from continental 4 in my mf 50 tractor, and try replacing them

[@wagon9082]

Good video Thank you

[@user-qv8df9vj2o]

I knew an older fella back in early 80s who had old dodge truck with 6 cylinder. About every 6 moths he would pull oil pan and shim bearings with really thin piece of leather type material. He ran it for many years hauling junk around the county but drove slow and easy all time .

[@rdallas81]

Awesome

[@digger_jon2778]

Lol shouldn't need to do this every 6 months there was something wring if they needed adjusting lmao

[@anon58973]

​@@digger_jon2778the leather would break down and he would need to reshim the bearings. You're skull is thicc boi

[@mikenicholson2548]

Josh great advice on holding the bolts and cap. My friend was rebuilding a 400 big cam. He thought he had the main bolt threaded enough. It fell out and landed right on his mouth. Needs to say your front teeth are not stronger than the bolt. It was a bad deal.

[@markm0000]

Sorry to hear that. It’s tough learning on my own so that’s why I watch as many videos as I can. I used to be a armchair mechanic but now I’m actually doing it and love it.

[@kodykj2112]

Oh man

[@barttglodo5582]

Jĺlppp00p0p0

[@sulemandurojaye1770]

Very useful

[@mikenicholson2548]

Josh great advice on holding the bolts and cap. My friend was rebuilding a 400 big cam. He thought he had the main bolt threaded enough. It fell out and landed right on his mouth. Needless to say your front teeth are not stronger than the bolt. It was a bad deal.

[@timf6916]

Good job

[@atomicdmt8763]

SOLID video........ I believe I can do it! Perhaps good rule of thumb to simply use the same size, good bearings?

[@jameshaskell6572]

I and multiple people that I work with have discussed torque turns with a impact and we are all to scared to do it. It does show that actually in the Cummins manual but we just haven’t seen it done in front of us. The engines that we mainly work on are German and they use the bolts u hate most, but actually inverted torques have more surface area for the socket and the load side so I see their purpose doesn’t mean I disagree because I hate them as well. Anyway I could go on and on about torque turns and why the factory has us do them and why I was scared to use the impact but I won’t I’m just going to do it. Seriously thanks for showing us, this saves our backs shoulders and hell my ezy red 3/4 bar which I saw u have as well in the tool box video. Merry Christmas

[@AdeptApe]

I actually just gave that EZ Red away to an apprentice as a kind of gift since I got a replacement 3/4" snap on head and bar. I've done a lot of torque turns with impact wrenches, on main bolts, rod bolts and head bolts. No problems and I've seen lots of other guys do the same on Cats, but German engines are a whole different animal. You look at them wrong and it'll through a check engine light.

[@jameshaskell6572]

@@AdeptApe I have that snap on 3/4 bar and drive too but in the marine world we don’t have much room a lot of times ,and taking the different size bars on and off is a pain even if I put a pipe on the shortest one it just feels unstable. I love that extendable ezy red for that reason although I have slipped the gears a few times and hit myself in the mouth. Our heads are inverted torx e22 150ftlbs then 3 90 degree turns and our mains are 250ftlbs and 1 90 degree turn. The mains are conventional head bolt 27mm head and I’m going to try your trick on those and maybe work my way up to the heads.

[@jeremytillery2234]

Merry Christmas

[@AdeptApe]

Merry Christmas to you as well Jeremy.

[@johnnylightning1491]

Fun fact. I used to work for Atlas-Copco in the industrial tools division. One of the multiple nut runners we made was a 32 spindle for Caterpillar heads (I don't remember what engine). I asked the engineers how they handled the toque sequence and to my surprise they didn't deal with it at all. Whichever bolt got tight first got tight first and so on. Not that you should ignore torque sequence but I don't think it's a critical as the manufacturers want you to believe. Keep the good stuff coming buddy.

[@reeceevans4044]

Atlas 🥰💗💗

[@ivanvarela3215]

And guys like this are why engine blocks warp!

[@fernandobriseno8164]

So tolerances for bearing sizes matter but not torque sequences or values? Hmm 😅

[@kevinwest3689]

A new guy that asked a guy that said a guy knew everything. Nobody could tell him what to do.

[@andyperkins2523]

I hope that this helps guys. degree of rotation = (360 / n) * m In this case, n = 6 (the number of sides of the bolt) and m = 2 (the number of sides rotated). Substituting these values in the formula, we get: degree of rotation = (360 / 6) * 2 degree of rotation = 60 * 2 degree of rotation = 120 So the bolt was rotated by 120 degrees when two flats of its six-sided structure were rotated.

[@Houndini]

My 4X4 mainly off-road use hunting/fishing vehicles in Appalachian Mts where our off road hills get way over 16%. It will without a optional 100% full external oil pressured system run your oil sump dry on steep inclines. I drop many oil pan once my oil pressure start droping below 25 psi or below cold & replace main & rod bearings back with Std. Bearings without pulling the engine. Just be careful because a lots times them 4X4 frames will leave you the room to do it with. I did my 79 Bronco that way this fall in less than 4 hour job. It Increase oil pressure right back to normal. Our main problem is over our steep inclines is oil starvation. I never seen that in maintenance manuals but if you careful know what you doing it works. Of course inspect your journals for wear.

[@Raise986]

I've heard using a butter knife with the blade bent in a curve works pretty well. Haven't had an opportunity to try it yet though

[@AdeptApe]

That seems like it wouldn't be strong enough for a Diesel Engine.

[@Raise986]

@AdeptApe I'll try it when I get an opportunity and I'll get back to you on that. I'd imagine probably have to push on the middle to keep it from bending while you push the bearing out

[@hansjansen7047]

WITH THIS TRICK , WHY WOULD YOU BOTHER?

[@davidsol9676]

blass u man great video

[@pedropedro2837]

Thanks

[@garyradtke3252]

Unlike a lot of people here I see little if any problem using an impact to angle torque. All that is required is to get the bolt to turn a certain distance and how that happens doesn't really mater. When removing and installing upper bearings under the vehicle I would slightly loosen all of the mains just enough to give a few thou more room. Along with the bearing removal tool this seemed to help quite a bit especially on installation but I had to be sure the bearings where properly located before pulling the crank back up.

[@cbmech2563]

I agree, do the torque with a torque wrench and then the bolt doesn't care how it makes the turn.

[@AdeptApe]

I'm sure the uppers would be a lot easier if all the caps were loose.

[@youtubeisawesome2487]

@@AdeptApe only if you like doing front and rear main seals, but to each there own. you might get away with it on new seals but holding the crank up by the seals is asking for it

[@johngoldsmith6629]

@@AdeptApe Seen fan belts to tight making the front upper bearing had to R & I. Especially on a 3208 that has several belts.

[@juanrivera8566]

I have one question. Is there gonna be a noticeable difference regarding engine smoothness while running after the bearings replacement? Or an increase on something? Great video, very detailed and full of knowledge. I know it's such a noob question I'm just finding a more appealing reason to do the same work but on a sports bike other than just maintenance.

[@RichardJW1]

great video. What marking pens do you use? The ones we get here seem to wash off easy

[@coryridder1937]

I have never seen the tool to roll the bearings out using the oil port! That will definitely be getting added to the tool box

[@AdeptApe]

You can even use a bolt with a flattened head.

[@johngoldsmith6629]

I have sheared them off on a stubborn bearing. Especially one that has had a failure and is stuck to the crank.

[@coryridder1937]

@@AdeptApe will definitely be trying the bolt. I've got an MBN tore down that the bearings are pretty tight.

[@coryridder1937]

@@AdeptApe do you have a part number for that tool? Thanks!

[@cbmech2563]

I've taken a small bolt and ground most of the head off when I didn't have the tool, works on most engines but not all. As a side note, I worked with a guy that only put the bottom bearing in. I shuddered every time he did it.

[@AdeptApe]

The other guy left the top bearing out or he only replaced the bottom bearing?

[@cbmech2563]

@@AdeptApe left the top bearing in and replaced the bottom. He said the crank was being pushed away from the top bearing. My thought was that you can't buy just the bottom so you might as well change the tops too. I did one that he had done a few years earlier and there were fissures in the babbitt with some pieces of babbitt missing, it had about 200,000 on it since he'd done bearings.

[@BeezyKing99]

18:30... all that dust, is why I prefer face shields over glasses/goggles when working underneath.

[@pureblood8427]

Harrison Slough from I-90 sure is beautiful.

[@largesleepermadness6648]

Question, could you use a torque multiplier on the two flat tighten spec?

[@h7qvi]

I would use a brass or copper tool when pushing things near the crankshaft

[@gustavoanuch890]

Only one thing, normally, you need to measure the bolts, if you exceed the specification, you need to change them, if not, just reuse them.

[@oldcatmech]

I saw were a mechanic took all the main bearing caps down at the same time! Engine had the old rubber front seal, rolled main bearings in, and when he started it was running rough! I said you took them all down with none for support the crank just slightly? The crankshaft gear had dropped down far enough to jump a tooth! Engine cam and fuel system were out of time! They had to pull the front cover to re-time the engine! It was an early 3406A engine! True story!

[@AdeptApe]

That's a really cool story. Not for him though. I always have left at least 2 mains in no matter what.

[@surfreadjumpsleep]

Merry Christmas. How would you know when this operation is needed?

[@bigdaddystep.]

Have you ever done overhead valve adjustment

[@harveyfinlay8250]

I have a 3126B apart that only has 55,000 miles on it. Do I need to use new bolts on the head, main caps and rod caps? Thanks for all the videos.

[@rayclifford9001]

Do you have a video on why a caterpillar motor at startup sounds ok,then sounds like it dies out but comes back? I got 2005 c15 accert, had injectors rebuild, new wire harness, but it was doing it before I had that work done.

[@badlanz8642]

Cool Channel im a ex cat dealer tech/teps deal now a diesel instructor

[@Ripsaw17]

Always use Lucas s*** sticks to everything great assembly Lube

[@carlodonnell146]

What about placing gasket maker in the groove under the rear oil seal; is it necessary to prevent leaks past the seal and can it cause a problem with fit?

[@carlodonnell146]

using the impact is just to make it easier to run the bolt in!!! that is what I do with most things because impacting parts on a vehicle may not always be a ggd idea.

[@rsmith3033]

i my self have never ran head,main or rod bolts up with an impact. i’ve allways used hand tools an a 1/2”or 3/4” torque wrench to finish up. an yes i am old school !

[@twood1954]

Merry Christmas great video. How do I send you pictures of destruction . Thank you.

[@Orlandojmarqzb1]

Hi. What's the name of the pin that you use to remove the bearing? Is not showed on the list of tools

[@anuradhabandara7878]

Great video. Thanx a lot for these kind of videos. I have one question. I thought that the tab prevents rotating the bearing inside the cap. But if the crush prevent that, i need to know the purpose of that tab on the bearings ?

[@AdeptApe]

The tab is for aligning the bearing in the journal bore during installation.

[@anuradhabandara7878]

@@AdeptApe @AdeptApe Thank you very much sir for your reply. These videos are very much helpful to us and we always thankful to you. " whish you a Merry Christmas "

[@mattluszczak8095]

Maybe switch to elec rattle gun to reduce air flinging around dust?

[@Julian_Solis]

Jw if theres no issues with the crank or rods but had issues with the liners do i need to measure the bearing clearnces or do i just throw in standard bearings ?

[@sdhighmonkey4012]

Hey I am going to medium/ heavy duty diesel school and I was curious what would be better for me to work for a company hourly or flat rate ? Plz any advise is appreciated!

[@christinad3425]

question. If the bearing is warped or in rough shape, would that mean i'll need to get new pistons also?

[@Mark_Tschetter]

How do i know if i should order standard size or .10 over size bearings?

[@samcoon3822]

Just a question why do you not use lucas in your engines

[@cameronturner7475]

Good God that screwdriver gives me the willies.

[@Oddman1980]

4:12 I had a rod cap from a Suzuki Samurai hit me in the face that that was upsetting enough, and it didn't weigh anywhere near 10 pounds.