How a Small Failure Caused Catastrophic Destruction! - 6.7 Engine Teardown

In this video, we tear down a 6.7 engine that came in with a mysterious knock. What we uncover is a small failure that led to massive destruction inside the engine. Watch as we break down the damage and reveal how something so minor can cause such catastrophic results. This is a must-see for any engine enthusiast or mechanic-don’t miss it! 🔧🔥
Buy your Used Car Inspection Guide!
(40 Minute Video and 24 Page Manual)
guide.davesaut...
SUPERCHARGED JEEP GLADIATOR GIVEAWAY!
shop.davesauto...
Dave's SECRET SAUCE!
shop.davesauto...
Dave's FLASHLIGHT!
shop.davesauto...
Shop Dave's T-Shirts!
shop.davesauto...
Follow us on all social platforms:
/ davesautocenter
/ davesautocenter
/ davesautocenter
For Business Inquiries Contact:
[e-mail]
www.davesautor...

[@supergrendel]

I'm fascinated that the same people who can afford to buy these trucks can neglect them to this capacity. Unbelievable really.

[@freddyramirez1820]

On credit you mean?

[@MrAnthonyfym]

They make money when they move. I have certain customers that only bring thier work trucks on rainy days

[@ajdest85UNC]

You're right that neglect causes a lot of these failures... Also BS ENGINEERING AND PARTS that just aren't made to last. All these variable cam timing engines are in theory if oil changes are done every 3-5k... And on and on... But all these tiny orifices that oil has to travel through and lifters that operate 2 pushrods .... Stop trying to fix something that isnt broke.I mean auto manufacturers not Dave's shop or any other shop.

[@nickd.4512]

They apparently have enough money that they don't care how much it costs to repair. Must be nice. Myself, the newest vehicle i drive is an 01 expedition 5.4 2v. As new as I'm willing to go. I can still fix most things in my driveway. Too time consuming and it goes to my ford tech who opened his own shop after working for a ford dealer for 30 years. And he's honest, doesnt charge outrageous prices or "fix" things that doit need it.

[@Pigtrapper]

​@nickd.4512 i think most people are so broke from monthly payments and insurance that they can't afford maintenance. Pretty bad when the tiny oil filter for my 20hp welder cost the same as my 5.9 cummins

[@seagullsbtn]

Dave, I love the way you are showcasing more employees every video. They're the team, and your team has tons of experience and knowledge. Nice.

[@DavesAutoCenterCenterville]

Glad you like them!

[@SyNergy81]

I like this technician in this vid. He knows his stuff and appears to be an excellent asset to the team

[@codo7]

I went to school to study diesel in 1977, we were taught if there were a catastrophic failure a motor needed to be disassembled and cleaned - the way you do at your shop, not just a wipe-down after spraying with solvent. A catastrophic failure is destruction of parts like we see on those rollers.

[@kylepalmer8013]

Hey Dave, my 2014 powerstroke did the same thing. I believe its a casting problem on the 13-15s and is almost always on the passenger side. My rocker arms (pivot arm assembly) had excess lateral play that I believed caused the rockers to pop out then send the hydraulic cam lash adjusters out. Truck had 180k miles on it when I found that lash adjuster in the oil pan. New rocker assemblies, pushrods, lifters, and lifter retainers and I am 40k miles on it with clean oil analysis every 5k miles.

[@InsideOfMyOwnMind]

"That's probably why you don't have a shop." Brutal but true.

[@jonkeau5155]

When I had my transmission replaced I had them also do the rear main on the engine. They only charged me the price of the seal. The fact is that if you’ve got things as far apart as this on that engine you might as well replace all the wear items, the parts are cheap and you already paid the labor to get there.

[@RoflCopter726]

Yep, buy once, cry once.

[@seanstephens3896]

I feel for this guy, I went through the exact same issue on my used 2014 6.7. Carfax looked great, but it wasn’t until the engine was out Ford needed the block casting numbers for the warranty we realized it was a used 2012 block. Carfax won’t show shadetree mechanics. Of course I went to a “friend” and shop owner who replaced with a new Ford long block. Honestly paid more for that than going through Dave. I stumbled on Dave’s KZbin after the fact or else being 30 miles North I would have taken my truck to him. Everything has a manufactured defect, in this case the extended oil changes suggested is that manufactured defect. They can’t keep making money if nothing breaks.

[@IntelligenceAp]

Dave never cuts corners ultimate respect for this guy

[@thumprrr]

You mean like using a screwdriver as a chisel taking the lifter apart?

[@stephenczislowski]

Because the perfect tool would have made so much difference

[@EricKing1976]

I just recently discovered my 2014 F250 6.7 rocker arms fell off the intake valves on cylinders 1,2,3, &4. Lots of fun.

[@Warrior_Resisting_Colonialism]

Ouch.

[@ShadowOppsRC]

Sign of a good shop is 1 like yours that does not bandaide the rig back together!

[@gulfrasta5844]

That oil pan. " And up through the ground came a-bubblin' crude. Oil that is, black gold, Texas tea..."

[@gouldnj]

So many auto KZbinrs don’t show shit, half-ass things for failure content and don’t have any true value. You and your shop are different Dave and I would like to say thank you.

[@DavesAutoCenterCenterville]

Appreciate that!

[@ontimelogistic1458]

@@DavesAutoCenterCentervillefind Cory’s engine?

[@stevenbrooks1243]

Looks like lack of oil changes from all that sludge in the pan

[@arthouston7361]

If I wasn't running my own company, I'd take a week off and come and work as an assistant in your shop. I left auto and truck repair with 4 Master certs in 2000 to go and fly jets. Sometimes, I miss doing what you do.

[@Kevin-fs3qd]

So weren't a good mechanic huh ?

[@brianlykins6663]

Dave, I love your videos and business philosophy. You have quality folks there, and it shows when their tools and tool boxes get shown. I'm a 45-year retired aircraft technician. My dad was an aircraft/helicopter mechanic all his life. If it rolled, flew, floated, or cut the grass he worked on it, that what I did all my life as well. So I do recognize little things like the tools and tool boxes. I disagree with one thing you said on this engine teardown. You said with 200k miles with the damage and metal shavings through the engine, you recommended overhaul. Now it may have been just the way I took it, but with metal contamination in the oil, it wouldn't matter if it had 10k miles or 200k miles, you only have one choice. I really enjoy y'alls videos and sharing your business with us. God bless y'all and keep everyone safe working on these things.

[@Centralflorida22]

Fred Flintstone wagon wheels lol your awesome Dave. And just look at that oil/sludge. Dude never changed his oil, that's why the lifter failed. I have a 2011 bmw 328i n51 and I change it every 3500 miles. Did a berrymans piston soak as it was burning a little oil and all is good now. 300k miles.

[@RussellBooth1977]

I was very lucky with my 5.7 litre Chevrolet LS1 V8 engine when the hydraulic lifters mushroomed in it because 6 years ago I had that engine half torn apart at about 338,000 kilometres (about 210,000 miles) & I just replaced the hydraulic lifters as well as throwing in a new Rollmaster timing chain & sprocket set because I had the timing chain cover removed to replace a leaky timing chain cover gasket. 6 years later & at 402,000 kilometres (about 250,000 Miles) it's still going good,I didn't even have to replace the camshaft, I have a spare 0965 camshaft which I bought for $35 AUD cash in hand after someone got a camshaft upgrade done on their series 2 VT Commodore when it was just a valve rocker arm bearing failure which caused the noise in his !

[@Fenix169motox]

Love the videos Dave, keep it up!

[@fucamaroo]

South Main Auto , pine hollow auto diagnostic, and this channel are required watching.

[@GrandePunto8V]

+ATS (Automotive Test Solutions), real Diagnostics (not parts swapping).

[@masterchiller9681]

Don’t forget rainman ray’s repairs, the car wizard and the car care nut

[@ar2043]

Hahahaha!!! You tell 'em Dave @ 8:15 and beyond for a few!! A lot of people, even some mechanically smart people, just don't get how important it is to tear it completely down and start from fresh once you have had metal debris flying through the engine.!!! CRITICAL!!! I used to run into the same problem with people who didn't want to spend the money way back in the day on their two-stroke PWC. Same thing. They have a failure of some sort, burn it down, you can see the head and top of the piston has been bouncing pieces of the piston ring all over the place and they want you to just blow it out and put it back together. (you know what I'm saying) No way!! Also, at this point in the game, most of Dave's customers know the type of work they do. Yeah, you can get it done a lot cheaper at many different places, but you are not getting the quality and attention to detail that you're getting at Dave's with him, and just as importantly, the WHOLE CREW. If I was in his area and needed something done that I couldn't handle, I'd be willing to be part of his clientele because I know what I want and that's that. If anybody thinks that Dave is selling people things they don't need, pay the fee for the analysis and then take it somewhere else. Guaranteed it won't be as good. Rock on everybody at Dave's Auto in Centerville Utah. 🇺🇸🇺🇸🦅🦅

[@dustinbieri9786]

The lifter most likely did not fail first. It most likely was the plastic tray that broke and allowed the lifter to spin. Lifter trays are a massive problem on the 6.7 powerstroke. Especially 11-14 trucks. Ford changed and updated the trays in the gen2 6.7. The bearing failures are normally neglect or 15w40.

[@crazeddiesel]

The more I watch this channel the more I think of how it would be nice if every shop was the same way. I can tell that any tech that works here leaves with a ton of knowledge that they didn’t have before.

[@lucluc2716]

Always wise words from dave! Love what you do man!

[@RonRussell-sj1zf]

One of those funky 4 rockers/4push tubes per cylinder engines. Watched a video recently about installing a Jesel conversion to 2 rocker/2 push tubes per cylinder, which is the way I would go if it were mine. (which it would never be, as I couldn't afford to repair it) By the way, nice comeback on the "why did you put a motor in it" group: "that's probably why you don't have a shop!" Love it!

[@eriksforestryvision8751]

That's why the 6.9 idi international harvester is not just the goat but one of the best motors ever put in a ford especially 83 when it made the least amount of power. No head gasket issues reliable work motor mine has over 400k heads never been off...

[@Arexodius]

I wonder if these lifters failed mainly because of neglected maintenance, too high oil viscosity, manufacturing quality issues or a combination of all three factors. Curious to know which contributed the most. These hydraulic lifters are obviously the weak point in the 6.7:s. But there are ways to adapt to the weaknesses of any tool. Some solutions are more foolproof than others, but everyone can learn to make what they have last as long as possible.

[@scoc253]

@03:10 dang complicated engineering design. one small tiny parts will mess you up and cost a fortune to fix 😅👏🏽

[@SyNergy81]

Definitely makes sense to me to pay more to make sure the engine is all set rather than a bandaid only to have future issues and have it tore down again because if the same original related issue. Thx

[@Bryce-z9v]

Honestly, it makes my blood run cold to see how pathetic those parts are. Thanks again team😬

[@Bryce-z9v]

Just had my 45yr in the trade as a Kiwi mechanic. I learn so much from this channel, thanks team. I know what not to touch 🤨🤨🤨🤨 Those lifters are so tiny for the job they do? Or is it just me?

[@sounboy4498]

That more seems like an oiling concern. Lack of oil changes

[@MrAluntus]

Very cool.. I'd love to see what happens next

[@MrDutch1e]

Dave didn't have his pocket screwdriver in his pocket. That's a demerit point.

[@StephenKirker]

😂

[@Z-Bart]

Gig for Dave. (From the movie Cadence) Watch it.

[@jamesplotkin4674]

Drop and give me 20.

[@DavesAutoCenterCenterville]

😂

[@Z-Bart]

@@DavesAutoCenterCenterville Gig for Dave. Lol.

[@jamesplotkin4674]

That sure looks like long overdue OCI which is premature death for any engine.

[@martinharper5112]

Thank You Dave. Much appreciate the offer of winning a motorbike. Questions. It's probably going spend more sending to the UK? And...I aint got a motorbike license either? Hope the person who wins appreciates the ride... M

[@keithfork8663]

The first time Dave doesn't have his EDC pocket screwdriver.

[@carlschroeder6811]

I'll bet he has his flashlight and secret sauce though.

[@alexgardener46]

7:34 was thinking the same thing! 😂

[@Sunspot-19]

Another PowerJoke broke, now Dave hasta feex! 😉That oil looks like a pressman poured printer's ink in the engine instead of Rotella. No wonder the rollers started sticking and faceted.

[@feelthesteeltatt00piercing]

Planned obsolescence describes the practice of designing products to break quickly or become obsolete in the short to mid-term

[@Outdoorsy368]

Planned obsolescence is shameful. That to me is sub human garbage. Is that how the ones that come up with that crap want the products they buy to be built? Totally shameful

[@feelthesteeltatt00piercing]

@Outdoorsy368 in California theres the worlds oldest light bulb 120 years old. Its seen 22 presidents . Still works today.

[@BL-yj2wp]

@@feelthesteeltatt00piercing And is incredibly inefficient, run like that any incandecent lamp will last that long.

[@feelthesteeltatt00piercing]

@@BL-yj2wpsure at low voltage it can burn awhile, things arent nade the same im absolutely sure you love replacing things more often . the dodge brothers would be furious if they were to see todays Stellantis products. Everything they did was stamped steel. Now its all plastic

[@josephprocopio8423]

It’s sad. But ALLOT of companies are doing this now in many different ways. Auto industry was among the biggest offenders

[@Bigiron429]

Crazy how big that Snapon impact is and still struggling

[@WyattHabel-f8n]

Right. That's stubby work 😂

[@Bigiron429]

@ I agree, I have a crap load of hand snap on tools. But honestly you have to be a fool to pay 600$ for that instead of 2-300 $ for Milwaukees lineup

[@eurowerx4267]

@@Bigiron429it’s more than $600 now. DeWalts better

[@nicholasc2238]

If there is one thing I have learned from watching this channel is do not buy a modern diesel unless its a must for work and you are putting the truck to work on a daily basis.

[@gordonv2456]

businesses idle the crap out of their vehicles and they say don't do it.

[@davetysdal5442]

Nice to see the boss in there being a part of the real work! Most of our higher ups just want to sit at their desks and play with their laptops. The thing is the higher ups are getting fired.

[@chipps1066]

A diesel engine is the last thing on Earth you want to half ass.

[@erickrosito3659]

Great detective work on cause of failure. What’s the cost difference between a full rebuild and to do a rebuilt ir bee long block repair?

[@halleffect1]

crazy how modern engines with roller lifters have so many cam wear problems. how in the world did flat tappet cams last past 100k?

[@v12alpine]

Flat tappets can go 500k+. Probably switched to rollers to avoid the mandatory 30-min breakin process and issues that can go along with that,

[@johnd4348]

People did not let their engine oil changes go bast 3000 miles years ago. Extended oil changes wearing out motors

[@carlschroeder6811]

@@v12alpine One main reason they switched to rollers is catalytic converters came along and wouldn't tolerate the zinc and phosphorous in the oils that were needed to lubricate the flat tappets/cam lobes, this fact leading to mandated vastly reduced zinc/[phosphorous content in oils. This is why you need to run special high zinc/phosphorous oil or additive in classic cars still running FT cams to avoid cam failier.

[@Kebekwoodcraft7375]

Better no customer than a mad customer 😊

[@82randyacman]

Can’t wait to get my light from yall

[@miketyler4536]

Dave how would you know about the lifter failure by just doing an oil analysis?

[@edwardhegarty750]

He said you would see a high chromium content in the oil.

[@bmoore3199]

If and when I ever sell my 19 year old, one owner 2005 Dodge Ram 2500 4x4 QuadCab 5.9l Cummins 170K on the clock I will provide an oil analysis for the prospective buyer.

[@volkerheinsohn5828]

oil changes ??

[@kevhauser]

Oh yeah..oil looks almost new!

[@traviceb]

I WOULD LOVE A BUILT 4.7 JEEP ENGINE !! BY YOU GUYS

[@BL-yj2wp]

It's called PowerStroke because that's what you'll have owning one.

[@carlschroeder6811]

I thought it was called "PowerJoke"

[@MikeHarris1984]

PowerCroke

[@user-ln7of9gs4s]

@@carlschroeder6811that doesn’t make sense. He implied having a stroke, and you’re implying someone will have a joke. 🤷‍♂️ what???

[@carlschroeder6811]

@@user-ln7of9gs4s Are you really that dim witted?

[@brandeehose5434]

Ford learned their lesson with the 7.3. …. They’d never sell another truck unless they made an engine that failed

[@Guido_Sarducci007]

This is where young people need to work, in the trades. Get a job in a pro place like this, start to build your tool box (Snap-On is not a requirement) listen and watch the older guys. Most techs will bend over backwards to mentor you. Give it three years and you wont believe how far you came WITHOUT college loans to pay back.

[@MsFireboy2]

Great find. Thanks for posting. So were you able to give customer a ball park estimate on total engine rebuild?

[@johnharris7191]

It may be really expensive but when they get their vehicle back the engine is almost as good as new.

[@rigell2764]

It will be better than new. Have you seen the quality of engines coming out in the past few years?

[@wickertwm]

Just for those who may be interested a rebuilt Lycombing O540 will cost you between $50,000.00 to $60,000.00. A new one will cost about $150,000.00. So if you want reliability you will have to pay for it. No free ride. Dave's engines don't look that expensive after all, do they?

[@jamesgeorge4874]

No "B" in Lycoming. And aircraft, are whole next level $$$$ toys, the next step up from boats. Gotta pay, to play bud. Nobody is missing a house payment to get their airplane fixed......

[@BruinHerr-bj7uk]

Yeah but if your aircraft engine fails you crash and probably die. If your truck engine dies you just coast to the side of the road and crash at a motel for the night.

[@wickertwm]

Aircraft engines are maintained better that auto engines just because of the rules set forth by the FAA. An aircraft engine like the Lycombing would have to have a complete overhaul (kind of like Dave's rebuilt engine) after 2000 hrs. This diesel engine with lifter failure is probably running more than the 2000 hrs that would be legal in an aircraft engine. YOU HAVE TO PAY IF YOU WANT TO PLAY

[@brendatorres6023]

I’m looking into purchasing a minivan for me and family. What do you think of the Chrysler Pacifica? Or is there a brands that you would recommend that we should look into instead? It’s really hard to know what is a good brand when you’re not a mechanic like me.

[@kinoG242]

So does the block need to be changed as well?

[@dorianleclair7390]

Looks like lack of maintenance. That oil was filthy. Extended oil changes are not ideal.

[@repairvehicle]

Another neglected engine, was not maintained to high standards. But followed good enough advice

[@PeterMacGrergor]

Great decision.

[@mickwolf1077]

Would that kind of wear be from poor lubrication from lack of oil or oil changes?

[@joebaucom4537]

Great !

[@tvtonite79]

I understand about the oil analysis & agree, but what if they change the oil & don't drive it. Many dealerships/car lots do that. Would it still show up?

[@tylervankampen6160]

Where can I get an oil analysis?

[@loluspololus]

To many camshafts lifters problems lately on chevy ford dodge engines

[@Gtforn2]

quick question, does/can the camshaft be the reason of that failure or is just a lifters failure?

[@budlanctot3060]

Dave, for the edges of the roller to get worn down like that, it looks like the lifter roller is wobbling like a bad caster wheel on a shopping cart. Are the lifter trays allowing that, AFTER the roller bearing needles are beginning to fail?

[@michaelbegay9573]

All of the engineers at the big three are looking and saying "that's what's happens?"

[@Amarillobymorning777]

Was designed to fail😊 No question about it

[@Dankcatvacs]

condition- boom bang b roke cause- broken lifter confirm, confirmed 8:32 sludged up lack of maintenance! hey 9:04 etch - a - sketch refill! wouldn't you feel a missfire if the cam is wearing out?

[@paulvlug-zu4tz]

At 8 minutes 50 Dave is making gravy for his roast dinner😀

[@PGcrazy6]

ATTN DAVE, what's your opinion & advice for adding Sea Foam to motor oil ? I saw this suggestion on a KZbin video. I'M old school & this sounds dangerously foolish. I'm assuming the additive has saltwater in it ?

[@brycensfishing3149]

Daves show makes me never want a desiel truck again lol

[@johnd4348]

I use to do hvac service a few dozen car dealerships and they had dozens of engines that failed on pretty new cars. I wonder why all these engins fail before 100 k miles. Could it be extended oil changes.

[@fair-gamer9453]

@davesautocentercenterville A while back y’all posted a video about the 6.7 oil pick up tube. In the video y’all put some sort of one way check valve inside of the pick up tube to not allow all the oil to drain back. I would like to know what y’all placed inside of the tube or how it was Fabricated. Are y’all selling the check valve or how can I get a hold of this? I’m located in Texas and about to pull the upper and lower pan off of my truck which runs a much bigger turbo a lot more fuel and Other added goodies. Could y’all please expand on what was done or give insight on how I can get a hold of one of these check valves? Thank you for any info or advice!

[@anthonyandreula3978]

HOW in 2025 are we STILL dealing with lifter issues all across the board??!!! This crap is unacceptable and really really hard to believe.

[@wickertwm]

Watching your channel and I am starting to see that every engine has an issue. This lifter problem destroyed the entire engine, and it doesn't seem like it could be prevented with maintenance. What I get out of this, is that if I need a diesel (or a gas truck they both have lifters that can fail) then buy new, and get a warranty. Sell when the warranty expires. These engines seem like a ticking time bombs. Its not if they will fail but when. Aircraft engines like Lycombing and Continental also have lifters but because they are in an aircraft they can't be allowed to fail. Very few lifter failures in an aircraft engine. Why can't auto engines be more reliable?

[@oceanmariner]

There's gotta be more to it. Like low oil pressure, intermittent oil supply, collapsing oil filter, maybe an oil gallery restriction. It's not common to have several lifters with excessive wear and it's not common to have multiple cam lobes with excessive wear. Along with main and rod bearings showing signs of trying to spin. Bearings spin because of contact. But with oil pressure rod and main journals never touch their bearing, instead riding on an oil film maintained by pressure. Maybe the maintenance wasn't good and when noise started, the engine got a couple quick oil changes making the sludge situation look better. Old Marine Diesel Rebuilder

[@dc6233]

On top of this failure diagnosis, was it the 200K plus miles on this particular motor that it's just wore out? or did the owner not use a quality engine oil, or was the oil not changed enough??

[@uncleKai_SWW]

@3:51 just look at it 😭🤣

[@garyharrington5300]

We've had 3 6.7s go down in the fleet ,it was determined that the driver had changed the oil and used 15 40w ,expensive lesson for shure

[@supergrendel]

@@garyharrington5300 15w-40 should absolutely be fine for a 6.7 powerstroke unless you are regularly starting it like sub zero temps every single day.

[@Warrior_Resisting_Colonialism]

What ever happened to the good old 7.3l's?

[@BigDaddy_MRI]

Diesel engines are very hard on oil. Change it often. Even the finest metallurgy will fail without viable lubrication.

[@Mr.J345]

Hey Dave have you torn down a 7.3 Godzilla yet?

[@rogerhector5885]

what caused that miles or oil left in to long

[@Lawnfella]

How many miles on it?

[@deanmeyer1815]

He said about 200,000 in the video.

[@dirtymaxjones9732]

Must of let it warm up for to long

[@farisvernon9920]

What happened to the quality? The pin on the duramax used to be a keyway and it's pressed on the powerstroke and they had dog bones for the roller lifters now they just expect em to stay put

[@jasonvesmam7044]

Dave, why can't I find a vvt cam actuator for my 2007 colotado 2.9l. Everyone say part discontinued. Why?

[@Midge99]

Im only here for the flashlight & some sauce or summat

[@fredgompper4925]

That's not oil in that pan its sludge going for road tar!!

[@showtimemyles9643]

So one worn lobe on a cam and we should replace engine or rebuild? My dealer just replaces cam and lifters. Asking for learning purposes

[@kennethbrown8723]

Where do you think the metal from the worn cam lobe goes? It’s now through out the engine everywhere oil goes!

[@matt45540]

It's the cost of getting to it, once you get to a certain mileage and if you don't catch it early enough by doing oil tests it's not worth it. If you're 30,000 mi and you somehow heard it and caught it early sure but 200,000 is too far, just rebuild it If you plan on keeping it

[@86LukeM]

Dumping out the oil pan after saying people who think, he's just selling engines. Ouch.

[@David-yy7lb]

That is the worst rocker assembly I've ever seen in an engine...hey wait a minute after watching the video to the end the 6.7 uses two push rods per lifter to open both exhaust valves and intakes valves instead of a bridge to open both the intake and exhaust valves so that explains why the rocker assembly is so cluttered.....WTF Dave you need to open a shop here on the east coast to

[@stradplayer90]

That oil is incideously thick. Totally nasty.

[@Precisionmobile]

who in their right mind would put a cam and lifters in that and let it go people have a challenge using their brains i swear

[@Joseph-xe3kz]

Bet you it was blow by. Hole in the piston. 6.7 power stroke. They don’t work on any other motors

[@ppump24valve53]

They work on n rebuild everything

[@dsstaang]

They actually do more Cummins than anything.