73 Honda CB750 Custom Build Part 15 - Assembling The Crankcase Halves

[@Loopyengineeringco]

Unbelievable amount of detail in those castings. I can't believe they were designed almost half a century ago!

[@bullettube9863]

You are a lot more careful then the Honda factory, which never oiled any bolts, and did not use torque wrenches. Ever. I worked as a Honda mechanic and attended the Honda school for a week when the 750 first came out. Afterwards I never had to open up a 750 engine again for the next 5 years that I worked there. And we sold a lot of Honda 750s, in fact we set a record of 105 for Memorial day 1970! By 1969 Honda had their engine precision down pat and breakdowns were a thing of the past.

[@per9912]

Thanks for your videos! They are very nice to watch before doing CB750 surgery. I have opened my engine completely but it is always something new and better procedure to learn. Easy to forget when I did it for long time ago. I saw comment about sealer around the bolt holes for crank close to the shells. No sealer can end up in oil leak via the bolts. I have sealed there 4 times on my engine CB750K6, no problem. 5:th time withing a couple of weeks.

[@donniceblakely1075]

I'm actually doing one of these for the first time, I appreciate the information your sharing.

[@HackaweekTV]

Glad it was helpful!

[@jgodshall80]

I've seen some others touch on the Hondabond near the bearing issue, but I'll just keep watching and see if you have issues later on. As a professional technician for 15 years, I never get anything foreign near a bearing surface, not so much the bonding issue but a contamination issue causing a bearing to spin/seize later on. I have enjoyed the build so far.

[@johnbeardsley7360]

really cool,ive never seen a motor job so detailed.i don't understand why you didn't bore it while you had it all the way broken down.i really enjoy watching your videos,i love motors, speed and the great satisfaction of working on my own stuff.iam 62 and know I will always have more to learn and really enjoy it all,thanks john

[@emrguns1]

The lighting & camera are really crisp. Thanks again. Work shop very sweet.

[@timlane3650]

Great videos Dean.Very interesting, you make it look so simple.Have watched most of them.Your presentation of them is excellent.Keep making them👍👍

[@HackaweekTV]

Thank you!

[@timlane3650]

Still watching your Honda 750 4 rebuild videos Dean, have learnt a lot from them.I remember when Honda first brought the 750 into England in the late 1960s early 70s.We were amazed by such a wonderful bike ( but could not afford one) keep up the videos Dean very enjoyable to watch.👍👍👍

[@iviaverick52]

I'm currently rebuilding an 82 CB750. Totally different engine, but these project videos you have are still insanely helpful!

[@nlanfran1]

Cameron Fischer I just pulled my 81 cb750f engine out to start the rebuild process. Any tips or lessons learned you could offer? Thanks!

[@ncroft1383]

It's coming along really nicely! Always good to see a re-built clean looking engine! Good stuff, can't wait to see it all finished with the head and casings all bolted up!

[@csgoh1]

your videos are my youtube highlight every monday. Thanks!

[@bluangl9wingman]

Thank you for your videos. I may have to do this in the future and wanted to see what I was getting into...

[@jeremyclark28c]

Great Series. I got a cb500 and a cb750f Im turning into cafe bikes. I hope to have the cb500 done in time to ride it this summer. Your videos definately are a huge help. Thanks so much

Howdy! thxs for your videos... you made me put my "hands in the dough" as we say here, and been modifying my W650... me.. an economist/computer geek... Thxs once again for the inspiring work.

[@TEAMVISKAT81]

I really enjoy your Honda CB750 videos that are very good info and you learn something, am looking forward to the next video, greeting a fan from Denmark

[@thekmon]

Always learning something from your videos! Liking this series a lot.

[@dumbbeerholder]

I always thought torques were specified assuming dry threads...

[@willhoggard645]

Putting Honda bond und on the main bearing caps scares me. Is that spec?

[@panospyrgiotis2992]

No, it's not. Took great pains to plasti-gauge the bearings, and then put something in between the main cap mating surfaces. Honda bond only on the external wall mating surfaces.

[@shovelhead1871]

super awesome vid man! lovin the work that u do and explanation as you go... i've been toolin around with an '81 gs550 suzuki that is a cafe for now. Just wanted to mention to all those watchin to make sure your hondabond is not old.

[@kevinlancaster6506]

Love the videos. That engine is looking ultra Kewl right now. See you have fans in South Africa too. Peace

[@liamforeman2553]

Hey Dean, I was wondering if you could provide the link for those print outs that you use when installing your case bolts. I have a Clymer manual but would prefer simple diagrams rather than old murky pictures. Thanks alot!

[@Logjam5]

Good idea using the air on bolt pockets.

[@PetersHouse]

Great videos! I just discovered these last week! Not sure if you found out what that bolt was for yet at the 25:00 min mark, but I just pulled the motor out of my '77 CB750 last summer and will take a look tomorrow to see if my motor has that bolt or not. Again, great videos! Will definatly reference these during my upcoming rebuild!

[@PetersHouse]

Checked my bike tonight, bolt holds a small elongated hoop bracket on top that looks like it would contain the carb overflow hoses. Not sure how to post a pic. Hope this helps!

[@HackaweekTV]

Jordan House Got it!

[@ChewbacaTW]

Thanks so much for these vids dean... I'll be rebuilding my dads 76 CB750 sometime this summer. :)

[@touchpointpropertymanageme2889]

Excellent Video. What do you think of installing a normal gasket along with a thin coat of Honda Bond? Is that overkill?

[@jacobkjrchristensen8879]

Of course you did not . other clips were just well explained and detailed. I just miss a little about about bearings and how the different parts be installed . but I really enjoy your videos.

[@loloaqici82qb4ipp]

I've always found it useful to mark each bolt as I torque them with a color code sticker or sharpie mark. Then when I've finished I can check each bolt has the mark. Do other people do this?

[@DeanSegovis]

loloaqici82qb4ipp I did that when I was wrenching on cars every day. Always marked important bolt after torque with a paint pen.

[@Silentcrisis8]

Great videos! One thing is that I was always taught to not use oil on threads when using a torque wrench as you're reducing the friction therefore risk over tightening the bolts and stripping them?

[@krqkan]

Nice going bud! Sketching on my own Cafe design! Looking for a L-Twin or a V-Twin, not that big fan of the Inline engines. :)

[@HaaJeHaa]

The unknown bolt in the final drive area you ask for is a tapered wedge btw :)

[@davidlloyd3535]

I really enjoy videos on CB 750 , I have a 1977 k model everything together ... Just have issue with shifter I can't figure out ... Shifts up to 3rd and won't go on up to 4 & 5 ... When shifts to 3rd makes a louder shift noise... Bike was shifting fine before top end rebuild...can u help a guy out?????

[@luisvelarde8999]

Hi, where did you get that beatiful nice and new engine bolts? I was unable to find any new different than allen bolts. From Lima, Peru

[@MrRedrooster53]

What torque wrench would you recommend for similar motorcycle work?

[@alan0guy]

Would just like to say love the series! Followed your cafe racer build from the beginning and enjoyed every episode. Just wondering what you have in mind for this CB750 ? Classic look or anything special in mind?

[@DeanSegovis]

alan guy I'm undecided as to long term. Initially I'll just assemble it as a stock machine, get some time on it over the summer, then decide what kind of improvements to make.

[@alan0guy]

Sounds great thanks for the reply and keep up the good work.

[@TheGordy1950]

There is a ton of engineering in that engine............

[@bennygregory2629]

Hey I got all my pistons in the the head and they are hard to turn in the cylinder any suggestions please

[@HackaweekTV]

That's fairly normal. Did you install them dry? Put a squirt of Marvel Mystery oil in each cylinder and turn it over. The oil will help to "seat" the rings when you first start it.

[@bennygregory2629]

@@HackaweekTV ty

[@donaldmckinnon7467]

Why did you put Hondabond on the mains?You are messing up the main inserts crush.

[@robertbrandywine]

What is the oil pan meant to give access to? I mean, why did Honda bother to put in an oil pan rather than make a solid bottom to the engine?

[@robertbrandywine]

Ah, it's the oil pump, which you have not yet reinstalled. You show this in part 18.

[@KevinGreeneman]

Love following your informative videos. I have been looking for a good set of ft/lb and in/lb torque wrenches, do you find the ones you have pretty reliable? Any particular brand you recommend?

[@johnnym1320]

I see you put sealant beside the main bearing surfaces, Is this recomended by Honda? I know Kawasaki has a warning not to do this and to stay away from oil holes.

[@HackaweekTV]

No mention in the manual. It just says to coat the surfaces with sealant. If any thing tries to squeeze through, the crankshaft would stop it anyway. As far as oil gallery goes, there's a sleeve and o-ring on this engine so no worries there. Kawasaki's warning would have some merit around the oil holes because it could get into the oil gallery.

[@johnnym1320]

HackaweekTV not fan of putting sealant so close crankshaft or camshaft main journals, we have a guy in our shop put too much 515 on a camshaft main cap 60 series Detroit and then engine wouldn't turn over the next day, took a while to figure his mistake. Lol

[@DeanSegovis]

johnnym1320 515 is some pretty stout stuff. I've used it on Porsche flat 6 engines. Honda bond shrinks a bit at it cures and it stay pliable. I guess the only concern would be the channel in the main bearings getting a little in them. Oil should be able to move past it easily.

[@panospyrgiotis2992]

You're right. No Honda bond, or anything for that matter, anywhere near the main cap mating surfaces. It's totally inside the crankcase, it's not like oil is going to leak from there, and it just threw out the oiling tolerances in the bearings, which he took great pains to plasti-gauge earlier. Probably will spin a bearing because of it. It was difficult to watch.

[@rosswarby2430]

Hi dean great videos i always learn something new watching just a quick question what will you turn the bike into another cafe racer ,track bike , scrambler maybe ? Thanks anyway keep up the good work :D

[@DeanSegovis]

ross waby Not sure yet. Just stock for now, ride it, then decide.

[@SteffanoDucati]

Never seize best for all those crankcase bolts I find ......

[@MrC3mac1]

does the head have to be removed to remove the lower case?

[@willmann30]

MrC3mac1 I've asked this same question and on the CB750 forum the answer was NO! The full service manual says yes but that's for shop hours billing purposes! Just make sure it's in neutral, TDC and the flywheel rotor, clutch, points cover and oil pump has to remove be removed! Be sure to have Hondabond or Yamalube and the applicable gaskets before reassembly!

[@patmeyer8287]

No

[@Mekhanic1]

Fire it up! ;) thanks for posting your vids

[@bennygregory2629]

We're you get that blue print at please let me know

[@bennygregory2629]

For the bolts for the engine

[@HackaweekTV]

From a website that is no longer active. :(

[@RJL1000]

Another great video, Dean. Some of the critical comments here are ridiculous. Shameful even. Don't forget that the loudest boos always come from the cheapest seats. Keep up the good work!

[@criticalmass181]

Hi Dean. First off.....Love your videos. I watched all of the VFR 750 rebuild, and, though some things i'd have done differently, it was great. Anyhoo..... Do you know what medium these cases were blasted with? I'm using glass bead on my VFR750FV cases, and I seem to be getting nowhere....except for going through a truck load of glass bead. It'd seem that the Aluminium is too soft for the glass to do any good. On 316 it rocks.....but ally, it sucks.

[@krqkan]

I think sodablasting is the way to go. Not done it myself. But i've heard from others that soda works good. :)

[@criticalmass181]

krqkan Yeah.... I've not used soda, either. I'm not sure if it'll be any better than glass, but I suppose i'm going to find out...

[@krqkan]

Marty Smith My bets are on soda! :)

[@criticalmass181]

I'll let you know what my findings are. I hope Soda works, as i'm after a REALLY clean, crisp look. Thanks for your input. I'll be in touch, as soon as I have a result.

[@krqkan]

Marty Smith Yes please do! And good luck! :)

[@paulmrshll]

Wouldn't you want to put lock tight on the bolt threads instead of oil?

[@DeanSegovis]

Paul Marshall No need for lock tight. The oil helps allow a true torque setting.

[@bedfordshiremodeller4491]

Their's also what's called 3 in 1 oil if it's metal screws/bolts screwing into metal parts 💁‍♂️🔩

[@ProbablyDrunkATM]

I can't wait!

[@SaturdaysWrench]

Good stuff man!

[@michaelwilson4339]

Great video as all ways. After reading your note on this show I have a question. Have you thought about building your own computer. Its alot cheaper then buying a premade one and it might make a good video. If you do decided to build your own I suggest looking at a barebones kits from tiger direct. they come with everything you need.

[@DeanSegovis]

Right now I'm posting from a new machine, a Dell T3500 with a Xeon 3.20 GHz processor with 6GB of RAM running Windows 7. It has a 1 TB hard drive and I can upgrade the RAM to 24 GB. I'm hoping this will provide the speed I need. Thanks for the suggestion. :)

[@jacobkjrchristensen8879]

Hello mr. Hackaweek. Im a Big fan og you Channel and i enjoy every single video form you. But this one was a disapointment. I was looking forvard to a Walk thrue of every single part inside the block. How it works, how to check it and sow on. In stead you just slammed the engien together. : ( Sorry for the spelling but i asume you dont understand Danish : )

[@DeanSegovis]

I explained things in earlier videos on this project. Hardly "slammed" together. Thanks for watching. ;)

[@mikeford5106]

Better to fit all the parts into the LOWER crankcase half, ..... then lower the top half onto it.

[@pegmat77]

Hello Mr. Hackaweek, I enjoyed your vids and learned a lot watching them. I am currently rebuilding a Honda cx and have a question regarding the sealing compound. Can it replace the gasket? Since you did not use any gasket on your engine reassembly I assume it can. I read some different opinions about this topic and would like to hear yours. I am looking at this compound to use in my project www.louis.eu/artikel/elring-dirko-ht-sealing-compound-70ml/10004064 Thank you for your answer and comments. BR from Slovenia Mat

[@Mekhanic1]

I see you do this a lot--never put your hand on the end of the torque wrench. You can throw off the valve by a lot. ;)

[@emmanialk2523]

Goodmorning sir honda cb 175 engine rebuild video point to point do.

[@yamahaeleven]

Safety Nanny says: "wear eye protection while using air gun!" Want you able to make these kind of videos for a very long time.

[@skycarl]

No eye protection while cleaning with an air gun? Shame Dino, you know better bro. Carl