Detroit diesel 671 4 valve head install

The installation of the detroit diesel 4 valve head on the 671 gm 1947 pd3751 bus conversion

[@danhard8440]

kudos to the camera girl just because its a thankless job but your doing good getting in the angles so we can watch I thank you

[@ShainAndrews]

Yup nice work Kelly.

[@captgrant]

"Your bus attracts rain"...Tyler July 2019

[@larrygall5831]

When drought threatens the crops, farmers should call Scott. Have him drive the bus to their farm.. and give it an hour or two.

[@DellAnderson]

I'm sure you thought of the other advantages of hand tools besides conversation with your son: 1) Happier HOA neighbors and 2) (bonus) more pleasant KZbin audio. Not that anyone minds hearing power tools, just saying they're not necessary for an enjoyable experience. FWIW, almost every breakdown in my bus is followed by a rainstorm or snow, at least by the time the parts and tools are assembled. Thought it was just me.

[@viceroy6382]

Dad and Son working together, NOW that's Bible brother, 2 thumbs up Great video. cant wait to hear it purr again !!

[@TCB-1]

Knowing my luck, I'd drop one of those sealing o-rings down the camshaft galley...

[@1dollarten]

Me too

[@danhard8440]

same lol

[@tracylemme1375]

Over 50 years ago I was engineer on LCM-8 landingcraft. They had four 6-71 engines and no two engines were the same but they all had the same parts. What a versatile piece of machinery it is.

[@kevinhamling4675]

G'day Kevin from Australia. Great episode looking forward to the startup . You mentioned you tow your vw behind your bus sometimes have you any footage or pictures. ✌

[@nizzy1057]

I have a fantastic hose shop near my house. if you need any kind of special hose, or you want me to just send you out some straight stick for your cooling system let me know! they come in all colors too.

[@olemansailor6519]

I really enjoyed the film today. As a frustrated mechanic and big truck driver (stroke), I really enjoy seeing the technical part of your videos. I grew up with my father driving 2 strokes and really miss him when I hear one scream. I’ve never driven one, most of my driving was big hp Cat’s hauling coal. However, there are two guys who run with my old friends who still drive 12v71’s, proving that 2 strokes still live!

[@ranchertrapperdieselbuilds3632]

Who's your friends. I'm in coal country lot of big cats down here I work on them. Glad to see another coal brother on here. I work on 2 trucks today putting 700 to the wheels. 379 Pete's. 1 has polished fenders. I also just converted a accert to a single turbo. Twins went down the other day with 71 ton on the back we lemped it to the shop lol

[@dcw1540]

Sure been lot of rain. I farm an we got 280ac planted this yr.out of 2500 I know what you are going through. Thanks

[@The_Smith]

I can't believe you can work on that bus on the street and not have everyone in the neighbourhood there trying to 'help'. I can't even pop the hood of my 1/2 ton in winter to check the oil without the neighbours coming to see if I need a boost . . .

[@erikj.2066]

With him living in an HOA, if anything the neighbors are peeping out their windows with binoculars like Gladys Kravitz, and snapping pictures to bring to the next meeting.

[@jontisdall6248]

I find that kinda nice. I could be dying in the street and folks round here would step over me.

[@snuffysmiff]

Well dern, I was hoping to hear Lennie and His Screamin' Jimmy Orchestra playing us all a 4-valve tune, Maestro! Guess it'll have to wait 'til tomorrow...

[@SX939]

You need to make yourself a set of centering pins to set the head, I have a set for 53's, 71's and 92's. I makes easy work out of placing the head without displacing the o-rings. 73 - KV4WM - A US Navy Nuclear Submarine Veteran and Licensed Radio Operator.

[@markhull1366]

Ever thought of starting a second channel called "Bus Rain Man? Did I hear you right that you were going to Burning Man? Oh Boy! Here's what I can't wait to see. Will it rain in the desert when you go. I can hardly wait....Heee Heee Heee. Just having fun Scott. Love your vids!

[@larrym6019]

At Burning Man 2019 they won't be able to burn the man because of a torrential downpour of biblical proportions *LOL* Scott must be part Hopi Indian?

[@borochel]

Mark Hull, I believe it will rain if he has to work on hismbus while he ismat Burning Man. 😂😂. It always seems to rain on his own projects.

[@stephensmith1779]

It is nice to see you and your son working so well together. I worked on a version of these on various vessels in the RCN, back in 70's and 80's. Kudo's from an ex stoker in Nova Scotia, Canada.

[@mikemilburn7823]

Watching you put the head on with limited vertical room. It'd be worthwhile for the amount of times you'd use it, to make a solid lift bar out of tubing that would go across the head and attach on each end with a lug in the center to attach to the lift. Least that way, you could lift the head a bit higher and miss the top of the block when you're pushing it in.

[@djr1943]

You have a marvellous team with Tyler and Kelly! I really appreciate your videos which exemplifies your patience and sense of humour.

[@Spyke383]

That storm got pretty bad by my house. A few big trees came down on our street.

[@bogiewheelman71]

That was a tight fit setting the head back on . Hope the water manifold gasket survived .

[@timw6596]

Not sure if it really matters but would if not be smart to have valves lose when head is torqued down ...... ?

[@BusGreaseMonkey]

None of the rocker assemblies were attached.

[@schmittybuilds1624]

Look at the bolts that hold the rocker assemblies.

[@roverdad]

I recall you saying you could put the head on by yourself... not doubting you but am glad you had help. Getting that head on looked like quite a chore. Excellent video as usual. Also, could you detour through Atlanta on your travels? We could use the rain 😁

[@scottpollard3270]

Very satisfying to watch...enjoyed hearing the cicadas (if not it really sounded like cicadas)

[@maniyan_wanagi]

When Lenny says "Gimmie head", it's a major undertaking!

[@L00kWhatIDid]

Does the return line fitting have a restrictor hole in it?

[@Tiger351]

Meanwhile in Australia we're having an unusually dry winter, if you wanna get rid of the rain send it our way.

[@jackchatfield8869]

Robert Leitch which state are you in?

[@Tiger351]

@@jackchatfield8869 New South Wales but it's pretty dry in all states atm.

[@stanpatterson5033]

Do you ever get snow in the winter there? I follow a channel based out of Brooklyn, NSW, don't recall seeing any snow over the last two winters of his content.

[@Tiger351]

@@stanpatterson5033 Not where I am (Hunter Valley about 140 Km/85 miles North of Brooklyn), but it does snow in the Barrington Mountains about 60 Kms North of me (because of the higher elevation). It only gets down to about -5 C (23 F) here, cold enough for thick frost on the ground and freezing cold rain but not snow.

[@rudedog302]

So, any idea what the horse power increase might be with the 4 valve head, or will it be any different.? I know the turbo will bring it up considerably when you get there. Not being a jerk, just wondering how many times you used those head bolts over. I wouldn't be afraid to use them over once. Setting the valves, and injectors is pretty interesting, at least you don't have Jakes, as far as assembly goes any way. Nice if you have them, but less fun to set and deal with. Is your engine a 6-71N, or a 6-71T? Or some other model. If it is an N model, and has a compression ratio of 18.7:1, are you going to put lower compression pistons in when you out of frame the engine, and add the turbo? Or can you get away with the stock pistons, and the higher compression ratio, and add the turbo without needing to worry about that. Will you need different injectors when you add the turbo? Good video, very educational.

[@jmstew642]

Just a suggestion, there is a gasket compound called "high tack" that can be used on heads. It helps hold gaskets in place... FYI

[@Mullay2]

High Tack has been around for at least 50 years. I use it all the time.

[@marty0715yt]

That was funny Scott--Don't touch it , it's hot!! That's ok son. You left the "son" part out but I heard it in the back of my mind. How relaxed we get as age grows!!!!

[@JOHNMORIN100]

Hey thats a whole lot of AWSOMENESS thanks 100 poinnts John in Milo, Maine

[@tater_relocater]

Can you change that ratty looking fuel line? Not a hater . Been watching all the videos.

[@billmoran3812]

The inline 71 series is the most versatile engine ever made. You can change rotation, swap which side the blower is on, switch manifold sides, mount them in twin or quad configuration, etc. the quad 6-71 arrangement was a great marine engine for many years. A long lasting 1200 HP engine. And the 2,3& 4 cylinder versions were great for winches, hydraulics, generators etc. they just ran and ran. There was actually a 1 cylinder version, but I think they were only used by the factory for testing and not sold commercially.

[@jamesanderton344]

Bill Moran are the two cylinder units still around? Love to rebuild one if they’re not too expensive.

[@billmoran3812]

James Anderton there are lots of them. Most were used to power refrigeration on rail cars or for generators. They go for $1500-3000 depending on condition.

[@jamesanderton344]

Bill Moran thanks Bill. Looks like a fun rebuild that could power a small tractor.

[@SomeGuyInSandy]

This has been very educational. Thanks!

[@55nimrod55]

Your not gonna let a little sprinkle like that stop you from working, are you?

[@pgtmr2713]

So... more power? Higher rpm peak power? What do you expect to get roughly?

[@jospi2]

I think the 4 valve head is necessary for the turbo he's putting on later.

[@MrBugsier5]

At the moment nothing, After the install of the planned turbo it will inprove the breating of the cilinders.

[@pgtmr2713]

Diesels usually are tq monsters. I wonder if changing the valve angle would help breathing. I was just curious. I have a 2v 4.6L Grand Marquis. 4v swap would be great in my case.

[@pgtmr2713]

I meant complete engine swap with ECU. Considering the INTECH 32 from a Continental also. I currently have one car that only takes premium, engine swapped with ECU swap. The other option is just P.I. heads and intake. It's my daily, currently less than 100k on the engine. MTX is a possibility. I think that would be fun.

[@TheGalifrey]

Love watching your work but gloves yada yada, skin cancer yada yada... No excuses when you have a cameraman!

[@MrBugsier5]

gloves are for cautch sissy,s

[@timlee4204]

Late 1970s early 80s I worked for a bus company out of Brisbane Queensland, Australia. Had a few V6-71s, completely stripped one down for rebuild, rings, bearings etc. All the bolts were 3/8 UNC into the block, UNF nuts on studs, 9/16 spanner, when I git to the end of the job I was short 2 short bolts but had 2 very long bolts left in the wash tray? Clearly I had made a mistake somewhere and had to backtrack till I found where the long bolts went. Cant mistake the sound of a Screeming Jimmy no matter how many cylinders. Great to watch you guys working on it, buses don't give you much room sometimes. Ted from down under.

[@siaripop7]

I wonder if Lenny will be bringing rain to the "Burning Man"?

[@Barncaster1]

Marc Del Don’t jinx it Marc! That’s the very last thing you want. When it rains there the Playa turns into a glue-like adobe. No vehicle can move in it. Everything is locked in place till the Playa firms back up. It’s a really bad scene when it happens.

[@thomashollingshad5161]

torque is determined by the bolt tensel strength

[@marcelwillems4169]

Hello Scot, wy are you putting a 4 valve head on the engine? Love your channel. Greatings from Marcel Willems, Netherlands

[@OfficialNakatsuMegami]

If a State were in a bad drought, all they need to do is hire Scott to work on his bus and film it in the area affected, and Rain will show up every single time. Drought Solved.

[@tobiasblech1929]

@11:53, I know you've talked about International Compound #2 (peanut butter), but what is it used for, anti-seize or as a sealant of some kind, possibly a predecessor to loctite?

[@charanjeetsingh6137]

Might from where I can buy service manual for Detroit 149 series, used or fresh one? The major problem is I am from 🇮🇳. Plz suggest me, in here nothing Detroit.

[@gcrauwels941]

A couple of things just for S&Gs before installing the head: Make certain all the fluid is out of the head bolt holes and take a coat hanger or bent hose clamp and fish around the cam pockets for anything that could have fallen in there. Nothing worse than a busted block. Guide studs are a lot of help too, even if they are really short as you'd need here.

[@Mullay2]

Scott I am sure you appreciate Tyler's help with the repairs you are doing. After all you taught him everything he knows. How much more power do you think the 4 valve head will give you?

[@hotrodpegleg]

beginning to think you weren't able to do this today with the rain but I have to remember it rains in brazil before indy I should remember this growing up in both places

[@shreddder999]

uh-oh! he's using those evil hand tools again!!

[@jamest.5001]

Why not mill just a few thousands of an inch off the ends of the head to make it easier to install?? .020" should be plenty, Just wondering!

[@marty0715yt]

Does Tyler work on those nasty Fords?? 6.7 stuffed in the box. V8 monstrosity . Oh please remove the cab!

[@Spyke383]

I use to be the lead diesel tech at a Ford dealership.

[@Myrrydyn]

To seat the rubber "O" rings, what I usually do is to put a drop of Vaseline on them and put them in their place, it keeps them from from being displaced by the placement of the head

[@galegregory97comcast]

I seen you do this two times hope this one will make it run better then ever . You where hopeing for that head for some time to be on the bus I hope its runs great

[@mischef18]

Almost like doing brain surgery doing a head change on that bus bro

[@DoRC]

I got a sweet deal on a 400something piece kobalt hand tool set a couple years ago. I've been using them as a part time mechanic since then. I've used pretty much every brand under the sun (snappy, Mac etc) as a full time mechanic for years and so far I've been very happy with the kobalt set. I've used and abused them and haven't broken one yet. They don't quite have the level of polish as one off the truck but for my needs they have been perfect.

[@steventaylor5713]

Sad I was on the edge of my seat waiting to hear Lenny come to life and did not know that to set a 6-71 head you need to grease both ends ,,loved watching you do that with hand tools

[@sexcesslifestyle]

that bus didnt originally come with a 4 valve head. How difficult is it to exchange a 2 valve head for a 4 valve head

[@toddrouch7526]

Hahaha, my Dad always says, the tip reflects the service, lmao 😂😂😂😁

[@ShainAndrews]

I get a chuckle out of you two knuckleheads. Nothing like the banter between a father and son while turning some wrenches.

[@phillipmiller4139]

Agree!!!

[@randysteele7386]

Enjoy your videos,two great mechanics

[@journeymann1878]

I really like the sound of rain. We have 2 seasons here dry season and the rainy season.

[@overtaxed79]

Cicadas!

[@marcw2604]

We need that kind of rain here in Cali sort of not for a while tho.

[@marcleeke1105]

Why did you change head? Nothing appeared wrong with old head?

[@michaelcanto6175]

It's amazing no wonder why you built the shop!

[@gilbertfranklin1537]

When this old bus is done are you going to retire? ...(just kidding) - 😁

[@harriettedaisy2233]

He'll live forever then because the bus will never be truly finished.

[@justingray3456]

So what does the four valve head buy you without the turbo?

[@MrBugsier5]

Nothing, a bit better breathing maby..

[@danljohnston]

Scott, You must live in the rain forest!!

[@nhzxboi]

Original head gaskets had much asbestos in them. I bet new ones do not. But, the old ones did. Beware using "cookies" to clean deck. Definitely wear a respirator. Restoring these things can be a hazard if you are unaware.

[@18robsmith]

These engines don't have a conventional head gasket - there's metallic crush ring at the top of each bore, rubber "O" rings on the various oil/water passages and a rubber outer perimeter seal.

[@Mullay2]

When it rains in your part of Indiana it RAINS!! My brother-in-law lives in Jamestown, just a short distance from Crawfordsville. His wife is from Brownsburg.

[@stantheman489]

Hey Scott, I'm curious to see if you get any benefits such as better MPG's, lower engine temp, or better performance with the 4 valve head. My 1948 PD-3751 had the 4 valve head upgrade when I purchased it, just wondering why someone took the time and expense without any turbo.

[@rayjones3212]

WHAT?!?!? You and Tyler aren't just gonna man-handle that head without a lift? What?? I thought you were a couple of muscle-bound........ So how much did the head weigh back before you put it back on the engine? I doubt if I could even bulge it in any way -- including sliding it one way or the other. Great camera work, too!

[@ronaldheit196]

Great job. Really interesting to watch Y'all wrenching on that engine. That valve clearance double adjustment could work on pretty much every engine. We did it on P & W R1820-53 radial aircraft engines on Coast Guard Grumman HU16e Albatross seaplanes.

[@wi11y1960]

For that shaft you wanted to get the play out of at 2:00? Try McMaster Carr. You can order the bushings with the ID and what ever OD. Just checked the link, select sleeve. www.mcmaster.com/bronze-bushings

[@fastst1]

How much more torque will the 4valve head add? is that an N series? had an 8v71n in a ladder truck, straight piped and stupidly loud!

[@hasletjoe5984]

Enjoy watching your videos and am in fact scouting about for the right bus for my purposes. Question on this video, I see six sets of three rockers each. How are you actuating four valves and the fuel injector? Or how are they sets of valves tied together? Secondary question, I plan to pull a trailer with my soon to be acquired bus, can you give a rough idea of max capacity. Trailer will be used for 6-8 vintage bikes. Thanks, this is my morning routine now!

[@andrewbatty8954]

I can hardly watch as his arm disappears between the head and block. If it were me, being paranoid, I'd have a block of wood in there, just in case.....

[@larrygall5831]

I'm just curious.. why the checkvalve in the cooling system? I'm not a diesel mechanic, so I just don't know these things.

[@carlbrown5150]

Breaking down in Oregon was your first mistake Chuck! Everyone is Stoned.!!

[@Cemi_Mhikku]

So, I recently moved back home to help my dad out with things and while out running an errand yesterday, I spotted a mural by where the local Greyhound stop used to be. It's been there for years now, but it's got a little more impact to me than before. It's of your boy or one of his brothers, a silversides with a Miami destination sign up front. Assuming I remember the routing you mentioned in a previous video, anyway! Location is Homewood, IL on the corner of Dixie Highway and 187th. I'll try and get a picture next time.

[@samuelchartier3684]

My VW torque numbers are 30ft/lbs, 60ft/lbs, 90° then another 90° after that, whoof those things are tight!

[@manuelb8808]

The way you introduce your hand dawn this massive metal part makes me think you have and unflappable trust on your lifting device. Scary!

[@tryduck6993]

Just wondering about them injectors you got and installed when you had your 2v head redone month earlier. Did you have any issues from the 2 - C's being mixed in or did it all work out? Spray patterns looks good just from the month use with the 2v head. Did you have any other injector issues ?

[@BIllMcCambridge]

What a cliffhanger!!! Hahahaha How often to yall get your torque wrenches calibrated? Do yall use different torque wrenches for different spec so that yall are in the middle range of the scale and not at the less accurate lower or upper 10% of scale? Do you maintain a service log that stays with the Bus? I love your stuff its fascinating.

[@davidhuff1820]

Scott thank you for these videos, I was searching for info on the 671s in my boat. Once I started watching it is hard to stop. I just love the 671s and I have learned so much watching. My 671s have about 1200 hours on them, I don't think they are broke in yet. Great motors and great buses. Who used 671s in school buses? Looking for one to consider for conversion to a MH.

[@Steven9675]

Harden the socket after you are finished?

[@bahopik]

RVs usually have a side retractable awning. Time for you to make your own patented retractable awning for the back))

[@1982MCI]

And yet another rainy day for Scott an Lenny while it was another hot, dry day in NC again with no measurable rain now for going on 8 weeks now and I am watching my crops whither up and dry away from no rain at all. I had to buys semi tanker of water a week ago to water my watermelon field with and I think I’m gonna be bankrupt this year. I don’t think I can keep on going like this much longer before I lose everything just from no rain at all. Another great Scott and Lenny video production again. And a great camera girl job also!

[@tbirdracefan]

I was looking at the markings on the heads of the big bolts on the rocker assemblies and they looked like they were marked grade 7. Never heard of grade 7 before. Looked it up and sure enough there is a SAE grade 7 as well as a couple other grades I had not heard of (grade 5.2 and 8.2).

[@calartian85]

15:15 there is no substitute for experience in process excellence. If you explained every little step and reason in a manual it would be 10,000 pages long.

[@KinderYacht]

Maybe take the oil baths out of the way next time?

[@maxpuppy96]

Bet the neighbors love you guys big old bus with a dirty oily screaming Detroit sitting on street.

[@jamesanderton344]

Those channelocks you used on the water manifold nut looked special....some kind of compound leverage tool?

[@schmittybuilds1624]

Me and the wife have been talking about getting a used school bus to convert, but after coming across your channel we are now talking about getting one of these. I worked on these old 2 stroke Detroits for 13 years in the Marine Corps and I miss the sound of them. Love it!

[@dickjohnson4268]

A perfect ad for ''perma-grease." Gotta' love it. The grease on antique anything with engines is something to be experienced to understand it's impact on skin.

[@sailorman8590]

Awesome engine. We have rebuilt our marine 671s several times. These engines last forever!

[@Grandpa82547]

How can a 4-valve head work on a 2-valve engine? Don't you need another cam?

[@MrMauserb]

No, there is a bridge that actuates 2 valves from each rocker.

[@jcnpresser]

Yeah I had to help the diesel guy in our shop torque the head bolts on a 6.4 ford and it was busting our nuts. They were tiiiiggghhhtt.

[@TheSuraj03]

My teacher was a stickler for smooth movements when torquing head bolts. It's a bitch to do when doing some engines but it gives me piece of mind when I do it in one smooth motion.

[@monkeywrenchization]

My kind of mechanic, no gloves. I tried using them, but I always tore the damn things.

[@HankHill757]

Man that’s a pain, all those individual gaskets you have to not knock out of place while trying to install that heavy slab of metal in a tight spot. You have patience!

[@Rs500ybd]

Detroit Rainmaking machine.

[@Boot_185]

I like your wedding band. I had a gold one with silver designing on it and the wife made me get a tungsten ring because I kept bending my gold one when working. (was a auto mechanic with my own business).