V8 S10 DIY Crankshaft Polishing (Ep.6, Part 4 of 4) 

Crank scratches? You mean oil reserve valleys.

Give the guy some prop for doing this . This makes the build much better . Trans rebuilt and now the motor . Hmm what's next the diffs ? Once u upgrade one part u see what the next weak link

ive done this on a 3000gt vr4 engine. i got about 45k miles before the oil pressure started dropping. the mains were slightly not round, and wore out those bearings. the engine is 320hp stock. i have to admit, i got my moneys worth for a $100 rebuild

To fix any confusion. To anyone who gives this channel a thumbs down sit on it. This is one the most enjoyable things I get to see. Please to the owner of the channel, never think for a second that I was insulting you.

Subbed - you know the difference between force and pressure. You, sir, are in an astonishing minority on YT.

I like using a old leather belt in place of shoe lace

Awesome work my friend! Love the series, and how "real world" it is.

Well i was just about to comment about how you only have 31k subs and how you deserve about a million times more than that, THEN i saw the very ending of the video where you were playing with that spider. Just kidding keep up the good content. (But for the love of God stop playing with spiders)

I haven't read any comments so someone may have said this already.my hillbilly way on the MAIN journals was....I put the old bearing back in the block and insert crank and on the one being polished: leave lower bearing shell out and on the upper cap cut a piece of clothing (different thickness) and put sandpaper in cap like bearing and tighted down that particular cap accordingly as to how much pressure you want...and put crank bolt back in and spin crank with a drill or impact! KEEP OILED VERY WELL! Has worked for me! At the racetrack! With "melted" bearing material to crank! Removed and polished quit well!! Was amazed myself!

The rods run in a single rotational direction in the crank as well.

The harbor freight set of micrometers I got for $35 when they first came out wouldn't hold a zero. It was disappointing, but not really surprising. I *might* try a new set, but if I have to go cheap, I like grabbing older Starrett & Mitutoyo micrometers cheap on eBay. For work, I use new stuff, but in the home shop, and teaching new people the stuff, I like having reliable, good quality tools I got for $20-ish from someone not using them anymore.

This is one of the best build series I have seen. I look forward to doing this with my 1992 k1500 with a 350.

I did same but I used 3 laces exact same length wrapped evenly end to end. Then I put on low speed drill with very light pressure. I did unrepairable damage but I almost had it.

The rod journals only turn in one direction, same as the mains, not both directions as you said in the video. Otherwise, awesome job bro!

I've always wanted to rebuild my ford 351w, but I've decided it's cheaper and more entertaining to watch someone rebuild/modify a '88 s10 blazer. Keep the videos coming, I like watching them. It makes me want to buy an old junker and restore it!

Great job Dad

Whenever I hear someone sand something I get goose bumps...

just seen all six episodes in a span of 24 hours, good stuff man. i have a 89 s10 with a 350 sbc aswell but i just bought a motor and dropped it in, and i have a 92 2 door blazer. i love this type of content. just a humble guy working in his own garage

Was the donor car in a front end collision? I've seen the main journals like that from the car being in one, Nothing else wrong with the engine just some scarring on the mains. Good video duder.

You must go through A LOT of paper towels lol

As you know, the professional machine shops use a type of belt sander to smooth and polish the bearing surfaces on the crank shaft. Thinking about how I might duplicate the same procedure, I modified the above method shown by this RU-vid author by using a sanding belt (1 x 20 inches, or so in length) and a rubber adapter used for a round or barrel (cone?) sanding paper. I inverted the sanding belt and placed it around the journal to be polished (with the fine emery cloth already in place, as in this video tutorial). I chucked the rubber adapter into my power drill and inserted the rubber end inside the sanding belt and started the polishing in this manner. Why did I invert the sanding belt? The sanding surface of the belt allowed the rubber adapter to "grab" the belt more firmly, as well as to hold onto the emery polishing cloth firmly as well, especially when you have sprayed everything with WD40. I mounted the crank shaft on supports under either end allowing me to rotate the crankshaft as I polished the journals. It worked, but it took a little effort and concentration to maintain that belt in the center of the rubber adapter and the journal. The belts cost about 4 and rubber adapter which came in a kit for about 7 dollars, both at Harbor Freight.

good video! Never thought about doing that to the crank always just bought new ones lol

The dislikes were just Australians that thought they were giving you a like. (I know I stole it please don't kill me)

i have looked forward to this video a little more than I probably should have great video man keep up the good work

Hey, what about making a bow for the shoelace to spin the sand paper. Kinda like primitive bow drill .. stone age man style. Just upgraded with some adjustable shoelace attachment on one side. Btw great vids, keep up the great work.

Amazing hand shine. I appreciate your restraint. Kudos to you man.

Great videos! The attention to detail is amazing! Keep up the good work!

Awesome videos. I just discovered and subscribed to your channel last week. I'm just getting through your Blazer project. I quite honestly think this is one of the best rebuild videos out there. I cant wait to watch your other projects. Thanks for the content!

I’m looking forward to seeing the end result.Can’t wait to hear it run! And a compression test.

You said 2.437... Why is it 2.447? Maybe because they are 0.010 under But they are still out of tolerance. 2.448" - 2.449 - 0.10" = 2.338" -2.439" Yours is 2.4 37"..... That's at least .001" under the lowest and after will be at least 0.0025 -0.0035" I undersize!!!! So I don't understand.... That's too much!!!

This content has made you one of my top 5 channels to watch on youtube.

Although most magazines will say this can't be done and the engine will never last clearly shown is if the diameter is in spec, there is no out of round, and the surface finish is executable then this work around is just fine. May take longer but your own labor on your own time is only as valuable as you value it whereas a machine's shops can cost you big money.

As I understand it, grooves are not your problem. High spots and foreign materials are your concern.

Sometimes people way overrate machineshops and what they do. A machineshop wouldn't regrind that unless it has deeper scoring or pitting. They would just put it up in a rotating jig with a long sanding belt that would gently sand it down evenly.

your videos are my favorite

Nice engine series. Did some engine building tips on mine if you are curios.

Hello, still running? I m dealing with copper on my mains right now, i have 2 or 3 spots that i cant get out with wet 600grid. I hope it will work

I'm so glad you get all these views! The amount of work and time you put into these videos is just nuts

Best DIY engine video I have seen. Thank you. I subscribed.

1:44 ... cringe worthy

U deserve way more subscribers than U've got.

Good woork amigo 👏👏👏👏👏👏👏👏👏👏👏👏👏👍💪😎 frome mexico city DF thang you.

Great videos, but yeah, the best argument for fully eletric cars is their sheer simplicity.

Ps, maybe get a magnetic drain plug.

You do nice work. Respect!

Nice video cant go wrong with polishing a crank

I had a rod knock on an old 350 in a Monte Carlo with low mileage. We used a .0015 under sized rod bearing to fix this.

Rear main on small chevys get unfiltered oil fed to them, probably why it was the worst.

What type and brand of paper are you using? Thank you. I intend to do this with a perfectly running engine, passes CA Smog with no problem, with low oil pressure @ 235K Miles, 454, 4X4 truck in the truck on my back in my driveway. So I need all the help I can get.

If you don't get your engine dynamically balanced it's probably the cause of engines not lasting as long as they could have lasted. Also when doing this to a stock crank you could probably get an undersized bearing for the journeys you took more metal off of.

Gave this trick a try today but came into a problem. I was using 2000 grit to shine up an old crank but as soon as i applied pressure the paper stuck to the crank and my shoelace started slipping. I was using WD-40 but decided to give soapy water a try and that did the trick, the sandpaper would stick occasionally but i could finally shine up that nasty old crank.

Just for future reference. Never by any circumstances set the crank or cam down on its side without any support on where the bearings go or set them down with it standing straight up and down. Those parts can actually bend and A. Cause them to not seat properly and B. Cause uneven oil clearances and C. Cause an out of round rotation

Depends on what facilities you have available in your area. If I have access to a good crankshaft shop, I wouldn't touch a crankshaft and I'd take it to Carolina Crankshaft. In the Charlotte area there are a lot of good shops used by some of the Nascar teams who are mostly based in this area. But in more out of the way cities, I'd either ship my crank off to have a full service done on it or attempt your method.

I had a rod knock on an old 350 in a Monte Carlo with low mileage. We used a .0015 under sized rod bearing to fix this.

What prompted this rebuild? What was the symptom that was so bad that made you want to go through all of this trouble to rebuild it?

Its crazy i remeber on my old accunt waiting for each episode to come out getting ready to start a rebuild myself so awesome tips tear down and cleaning it

Get out of here thumbs down! You’re drunk, go home. My eye-chrometer is out of certification.

Thank you for this! I'm almost to the point of getting my crankshaft measured for bearings, and this will keep me from having the machine shop polish it.

Very nice process! I'm tired of being screwed by the local machine shop they charge $300 to polish a crank... excellent!

It's right to debur anything next to a bearing. you really don't want a microscopically sharp edge to gauge your bearings

At 7:45 yo can see the micrometer reading at .437. I like the process used. I will trying this method.

the rod bearings spin in one direction too... It doesn't really matter which way you polish tho

Rember that one fight with my sister and the sully stuffed animal amd that was ur wepon good times- dislex unknown

Why would you waste all this time on a weak 2 bolt main? I see your not building a race car but 4 bolt will let you have room to grow.

Have just watched the whole series to this point, and I'm thinking you should definitely keep up the great work sir.👏🏼👍🏼

You are the every man we need making this kind of video. Thanks for the close up before view.

Yo dude ...With Excellent Nodular Iron cast crankshafts available for close to nothing even being a Tight ass is your piece of mine and your time not worth the the cost of that New Crankshaft . Why take the chance ... I can tell you for certain after building car's since my first 66 Chevelle 327 in 1975 that being dollar cheap when building a motor OR really anything you are going to look to for reliability YOUR TIME IS MONEY .. And because I hate having to do anything twice I've learned after 45+ yrs of wrenching that if there is ANY question replace it ..OH and one more piece of free Advice when washing a motor that was just machined a bottle of Dawn and a bucket of hot water and a fresh pack of engine Brushes is key I can't stress that enough as much suds as you can make then be generous with the CRC to keep the machined surfaces from Oxidation ... keep up the good work your on the right path and Hey nice video ,,

love the series just wondering if a red shoe lace would work as well?

How has the engine run after doing this? Did you have to get thicker bearings?

Nice lookin channel!

That spider almost bit your finger off.

How did doing your own reconditioning like cylinder honing and crank polishing work out for you over time? Still running fine? Considering doing same for a Ford 302 5.0l rebuild myself.

That face on the paper towel at 6:25, looks creepy as all heck!-)

5:40 The rods actually only spin one direction on the journal, so you should polish it the right direction

I'd used 4000 thefinger the polish the Less drag you can even get 3-4hp off a good crank polish and I mean dyno proven on engine matters and that's literally all they did same engine same day sneer gas sane parts same trq. It's worth it imo because if you gain 3-4 here and there 4 or 5 or 10 times you can get 20-40 hp gain and that's feelable gains it cost time but mostly very cheap mods

Could someone please help me understand, how can you resurface a cam shaft / cylinder heads / etc without adding metal. Let's say it has bad scratches, how do professionals fill those grooves??

Ya. I've got nothing to do at times but I'd still take this to the shop to be done

Lol watched soundman do this with his Thunderbird worked like a charn

5:39 The rod doesn't rotate in both directions, unless you've discovered a novel what to make the engine runbackwards.

Did you have to use a different size bearing?

that's actually pretty ingenious using tape and shoe strings

This reminds me, there's a trick if you ever come across a crank journal with bearing material embedded in it. Instead of standing it off, try applying a concentrated solution of sodium hydroxide (lye). It will dissolve the aluminum and leave the steel of the crankshaft alone.

scoring

These are my little buddies, haha...

Ah, made it to the fourth dimension, glad to be here

I was told thats not how you use a mic

Polishing my shaft atm

My workshop is covered in spiders too..

Great job guy!!!! Awesome video

Wax shoelaces work better.

Emory cloth works the best...

Your way is outdated.

So satisfying to watch.

nice trick with shoe lace :D

Nice job

I went up to 2000 grit

looking good man!

Quantum Cassette lol

Keep going man love your videos

Yeah! Spider Bro!