Doc Harley’s caution for Twin Cam projects

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  • Опубликовано: 30 янв 2025

Комментарии • 363

  • @PSK66az
    @PSK66az Месяц назад +23

    Thank you for sharing all you years of experience! Saving us 100's, 1000's of dollars and all the frustration

  • @bongorick
    @bongorick Месяц назад +7

    Thank you, for all you do to keep us on the straight and narrow path.

  • @Peter-976
    @Peter-976 Месяц назад +19

    Excellent tip Doc!! Thanks

  • @RNintheTrenches
    @RNintheTrenches Месяц назад +11

    Priceless education in under 5 minutes, thank you Doc. Happy New Year to you and your family!

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад +3

      Thank you for watching and the Happy New Year wishes…Doc

    • @Tom-tl6sp
      @Tom-tl6sp 19 дней назад

      goes to show the poor engineering of Harley Davidson.

    • @RNintheTrenches
      @RNintheTrenches 16 дней назад

      @@Tom-tl6sp You missed the entire concept of the comment. It was to acknowledge the ability of an individual to express a thought simplistically.

  • @maddog3080
    @maddog3080 Месяц назад +8

    Thank you for trying to save us from costly errors, greatly appreciated!!!

  • @darrell3368
    @darrell3368 Месяц назад +29

    Thank Dr Harley keep up the great shows and tips ps Gods blessings to you and all your family

  • @Anthony071177
    @Anthony071177 4 дня назад +1

    Definitely a good cautionary tip. It probably gets overlooked by even professional mechanics at times since the draining of the oil , collecting in the screw holes is all done in such a tight spot away from open view. Plus most people wouldn’t even think about this being a problem until it becomes a major catastrophic failure.

  • @edharbas4828
    @edharbas4828 Месяц назад +7

    Thank's, again, Doc.
    As usual, a couple of visuals and your synchronized diologue, a real helpful piece of cake.
    Cheers all around with that beer.

  • @billcarson1966
    @billcarson1966 Месяц назад +8

    That's amazing but scary information! Wow! I could easily see that happening to me and I'm very thorough and careful in my approach! Then again, I typically leave the advanced stuff to the pros. Good stuff, Doc!

    • @Pork-Chopper
      @Pork-Chopper 26 дней назад

      The Pros can fuckup too! 😳

  • @tamayo991
    @tamayo991 Месяц назад +4

    FYI: The new head breather kit comes with shorter bolts but you still need to clean those holes out.

  • @jerrylong381
    @jerrylong381 Месяц назад +5

    Thanks for the tip, Doc.
    Nothing hurts the heart like installing a bolt and hearing a "POP!". It's amazing how much force can be generated by a 1/4"-20 bolt on a confined fluid.
    I learned my lesson years ago when putting the primary cover back on my 73' Sportster after rebuilding the clutch.
    I'm spinning the bolts in with a tee handle allen wrench, just bringing up to contact when I hear the "POP", and I see old silicone coming out of a crack in the case like little blue hairs growing before my eyes. My heart dropped to my toes.
    Luckily the crack was just between the bolt hole and the outside of the case. I was able to put sealer over the crack and finish the summer before tearing it down and getting it welded.
    That was the day I became religious about cleaning the threads on every bolt and bolt hole I deal with. The previous owner was a big fan of silicone, asI discovered when I rebuilt the motor. But the damage was my fault for not being meticulous in my work.
    Silicone is not oil, but they behave the same when put under pressure with no where to go.

    • @edharbas4828
      @edharbas4828 Месяц назад +1

      Conversely, would, say, a 1/32 drill hole through the centre of the fastener help by allowing pressurised trapped oil to escape as it was being fastened?
      The drill hole could be cleaned out of old sealant if need be. Mind you I do realise a cotton bud would be a lot easier, just barn-storming.
      Cheers

    • @jerrylong381
      @jerrylong381 Месяц назад +1

      @edharbas4828
      I clean them out with the correct size tap and then blow it out with compressed air. I've never had a problem after doing that.

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад

      Thank you for taking the time to post your experience….Doc

  • @hazepennington9303
    @hazepennington9303 Месяц назад +22

    Great info DOC Harley , I recently did the heads on my twin cam for the first time and I was lucky to spot this problem in time I also found out another place is the cam cover and oil pump bolt holes where oil will puddle up into some of the holes , I clean the holes out with a Q-tip and Yes it's a great idea to always clean out any holes on your motorcycle that collects oil before threading any bolt into them , that could save a person a headache , time and money.. Thanks alot DOC Harley 👍💯

  • @MichaelDay-cs4gj
    @MichaelDay-cs4gj Месяц назад +2

    Wow, I know the process of hydraulics but never thought of that one. Man!!!!! Gonna start cleaning out holes better than ever. Thanks

  • @samrotolo7303
    @samrotolo7303 Месяц назад +3

    Thank you for the reminder I dont think I am taking that serous enough. I have a rear rocker gasket leaking/weeping and I read to clean out oil from holes but I have now made note in my service manual for when I decide I am going to fix my bike.

  • @jamesskinner1101
    @jamesskinner1101 Месяц назад +2

    Thank You Doc Harley! And thank you for taking time to meet and talk with me.

  • @williwichtig9344
    @williwichtig9344 Месяц назад +5

    Hi Doc, thank you very much for this. It's a brillant information for everyone doing it for the first time.
    Greetings from overseas, Germany 😉✌️

  • @randybard224
    @randybard224 Месяц назад +4

    Been there done that
    I heard it break
    I found the piece that broke off
    Cleaned it up / jb weld it in place.
    A little thread sealant on the bolt
    80+k on the repair never leaked
    Lesson learned
    Now I blow every single hole out with air no matter where on the bike it is!!!

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад

      Thanks for sharing Randy….Doc

    • @rayss3323
      @rayss3323 Месяц назад +1

      Great reminder to clean out ALL blind holes. Thanx!

    • @jefffrayer8238
      @jefffrayer8238 Месяц назад

      I agree with the repair you did. Sealant on threads stops the oil seaping down and J. B. Weld makes sure. No pressure there.

  • @user-vr2tx4tt6b
    @user-vr2tx4tt6b Месяц назад +2

    This is why these videos are so great. Thank you, sir.

  • @rsbharley4766
    @rsbharley4766 Месяц назад +3

    Excellent tip Doc, thanks for taking the time to share. Cheers

  • @thomasdurante3084
    @thomasdurante3084 Месяц назад +1

    Good advice for sure, as a former toolroom machinist learned to blow out holes/especially threaded ones for debris/dirt/coolant/liquid on fixtures, fittings, assemblies, it prevents headaches in future

  • @alveus8205
    @alveus8205 Месяц назад +2

    Wow. Such a small thing can lead to a big problem. I did mine a few years ago and cleaned the bolt holes so the loctite would adhere better. I’m glad I did!

  • @jasonshortphd
    @jasonshortphd Месяц назад +1

    Fantastic tip. I wouldn’t have thought about that. I know it logically, but I wouldn’t have thought that the casting would pop.

  • @kiwibiker9754
    @kiwibiker9754 Месяц назад +4

    Classic! As a wiser man than me once said " a little bit of knowledge is a dangerous thing!"

  • @susandavis5833
    @susandavis5833 Месяц назад +3

    Thanks Doc. I'm about to put mine back together and didn't know this.

  • @scottlint7016
    @scottlint7016 Месяц назад +3

    I just blew a bolt out when replacing the breathers. I threw gasket maker into the hole and tightened down. Good to go, zero issues since.

  • @dieselsoggydog6299
    @dieselsoggydog6299 Месяц назад +8

    At the moment you said the bolt started to slow down but still goes in, I guessed oil was in the whole. Simple air gun to cleaner it out works. Can't believe that casting can break with that light of torque. Those bolts do look like they are longer than they really need to be.

    • @Dipndots87-ms6ds
      @Dipndots87-ms6ds Месяц назад

      It’s not so much about the torque of the bolt as much as the hydrologic pressure.
      I did some tests years ago with different cast aluminum pieces like aluminum differential cousins and aluminum cylinder heads on small engines. I put different gasket maker and different viscosity oils on the threads and in the hole in different amounts.
      What I found was the smaller the width of the hole, the faster the casting craked. The overall depth of the hole wasn’t as important as the hole diameter.
      Obviously this was just some bs test I conducted with scrap parts but it really opened up my eyes on how fast things can go bad when we aren’t paying attention to the little things.
      No go out and get you some scrap pieces and start destroying stuff in the name of science!

    • @dieselsoggydog6299
      @dieselsoggydog6299 Месяц назад

      @@Dipndots87-ms6ds I was going off the math. With a 6.35 mm bolt with a drilled hole surface area of 0.3167 cm2 and 1.3 Nm of force on the bolt. It would only develop 6.23 psi of hydraulic pressure. Correct me on my math if I've missed something.

    • @dieselsoggydog6299
      @dieselsoggydog6299 Месяц назад

      @@Dipndots87-ms6ds Went and did the math. With a 6.35 mm bolt with a drilled hole surface area of 0.3167 and 10 to 16 Nm of force on the bolt. It would develop around 45-70 psi. It would break it if the casting was thin enough.

  • @Rollie396
    @Rollie396 Месяц назад +2

    As soon as I saw the thumb nail I knew what this vid was about lol
    I’m amoung the meatheads that did this. I heard a little plink sound when I tightened that bolt and I learnt a lesson that day. I mixed up some jb weld on the end of a popsicle stick, smeared it around the underside of the casting and let it cure. That was 12yrs ago and I haven’t had the leak since….I’m also sure to blow out blind holes now before threading a bolt into it.

  • @montanaguy
    @montanaguy Месяц назад +2

    Great post, AS ALWAYS, Doc. Thank you so much and Happy New Year!!!! Me and my Twin Cam can't thank you enough!!

  • @RiseNRip
    @RiseNRip Месяц назад +2

    Just in time Doc! I'm doing this job on my bike next week and didn't know this.

  • @Lem-HDtech
    @Lem-HDtech Месяц назад +1

    Did it on 1 of my first jobs 😢
    Cleaned and silicone was a good temp fix until we got a new one to replace it.
    Lesson learned. Great tip, always love the videos ❤

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад +1

      I know that feeling from my early days…Doc

    • @Lem-HDtech
      @Lem-HDtech Месяц назад

      @LowCountryHarleyDavidson
      Indeed. Live, and learn 😍
      Best to you and yours. Hope you had a good Christmas season.

  • @Dave-he9uq
    @Dave-he9uq Месяц назад +1

    I learned this lesson the hard way back when I was a new tech. I used Permatex Ultra-Gray and everything was fine luckily. Now I fill all the holes with brake-clean and blow out with compressed air.

  • @kmeades43
    @kmeades43 Месяц назад +3

    That's a good one Doc. Thanks for the great advice.
    Ride safe from Sydney Australia 🤘

  • @doylehenderson319
    @doylehenderson319 Месяц назад +1

    Thanks Doc for a very valuable tip!!!!! That's working like a brake line.... you can compress air but not liquid. I hope you and the family had a great Christmas together and wishing you a Happy New Year!!!

  • @stlchuckhd
    @stlchuckhd Месяц назад +3

    Ouch! Thanks for the video Doc!

  • @shameless5868
    @shameless5868 Месяц назад +2

    Preciate that tip doc. I never gave that a thought.

  • @jeremyankney1733
    @jeremyankney1733 Месяц назад +2

    First one I broke it popped really loud and an oil mess everywhere. Expensive mistake. Now I do exactly what you said. 😊

  • @gordonmiller7246
    @gordonmiller7246 Месяц назад +3

    Hanks for the tip as always Doc. Great job.

  • @MarshallParsley
    @MarshallParsley Месяц назад +2

    Thanks Doc. I’m making a note of it right now in my service manual.

  • @neildewitt2869
    @neildewitt2869 Месяц назад +5

    Merry Christmas 🎅 Doc from Alaska!

  • @greenmarine5
    @greenmarine5 Месяц назад +6

    very good point Doc, liquids can't be compressed so something has to give. 👍👍

  • @GIGABACHI
    @GIGABACHI Месяц назад +2

    Holy Crap.
    Way to ruin your day in the most innocent way thinking your are doing yourself a favor while learning something new.
    Thanks for the heads up ! Very important info.

  • @murphy6767
    @murphy6767 Месяц назад +9

    Don’t use the same bolts either the old breather has longer bolts. The new breather has shorter bolts. FYI. ✊🏻✊🏻✊🏻

    • @gloryland59
      @gloryland59 Месяц назад +1

      If short bolts why then would it blow out casting

    • @dotarsojat7725
      @dotarsojat7725 Месяц назад

      @@gloryland59Hydraulic pressure from the trapped oil is what causes the damage.

  • @paulprosser4108
    @paulprosser4108 Месяц назад +1

    Another excellent tip Doc. Hope you continue to educate us home mechanics. Hope you have a good New Year.

  • @donpet8258
    @donpet8258 Месяц назад +1

    Very useful info !! Thanks much !! I just had mine replaced. I’m glad the Harley dealer did it now. !!

  • @h.d.mech.mortenson2098
    @h.d.mech.mortenson2098 Месяц назад +2

    Hope you had a great Christmas Doc. Happy new year !

  • @GJM866
    @GJM866 Месяц назад +3

    Would this apply to evo heads also? I'm doing rocker box gaskets.

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад +1

      Yes but not blowing a hole. It will pull threads…Doc

    • @GJM866
      @GJM866 Месяц назад +1

      @@LowCountryHarleyDavidson Okay, thank you!

  • @67Screwy
    @67Screwy Месяц назад +3

    Brilliant thank you Doc

  • @stevemamooshka3425
    @stevemamooshka3425 Месяц назад +2

    This makes me wonder if screwing in that bolt very slowly would let the oil seep past the bolt threads.
    Of course, getting the oil out with a couple Q-tips would be a whole lot faster.

  • @arnoldschachat
    @arnoldschachat Месяц назад +1

    Excellent tech tip Doc!-I upgraded my breathers a couple of years ago and did not check your tip-I must of been lucky or just used break cleaner to clear the holes.

  • @scottlin777
    @scottlin777 Месяц назад +2

    Thanks for another great video doc.

  • @fearsomename4517
    @fearsomename4517 Месяц назад +3

    Great advice Doc.

  • @hdbikerdave5835
    @hdbikerdave5835 Месяц назад +2

    Thanks Doc.
    Merry Christmas and Happy New Year!

  • @NLRider-i1m
    @NLRider-i1m Месяц назад +1

    That is a very valuable important tip. Thanks Doc. Happy new Year

  • @joeharley87
    @joeharley87 Месяц назад +2

    Another good tip. Happy New Year Doc.

  • @jeffmorrison5274
    @jeffmorrison5274 Месяц назад +1

    Thanks for Tips and I never knew about this... you are man DOC ! Have a happy Holiday !!

  • @Giuseppe_De_Bellis
    @Giuseppe_De_Bellis Месяц назад +3

    Cheers from Italy, Doc!☺️

  • @dougk9647
    @dougk9647 Месяц назад +1

    Well,.....that was a real eye opener. Thanks Doc.

  • @oldamerican8070
    @oldamerican8070 Месяц назад +1

    Thanks, Doc. , I enjoyed hearing all your advice .

  • @johnschoonmaker-tm3ll
    @johnschoonmaker-tm3ll Месяц назад +1

    Great info, have noted it in my service log. Thank for posting this video. 👍

  • @lukepace8546
    @lukepace8546 Месяц назад +1

    Great video and tip as usual Doc Harley!

  • @tommontague5721
    @tommontague5721 Месяц назад +2

    Never knew.....Thanks Doc

  • @qf4phlyer
    @qf4phlyer Месяц назад +1

    Once again, Doc, great information.

  • @johnpinkos2144
    @johnpinkos2144 Месяц назад +2

    Great advice & tech tip, thanks for sharing.

  • @HellOfaDay54
    @HellOfaDay54 Месяц назад +2

    Thank You Doc for that good information.
    when did Harley change over to the newer breathers as I know in the older twin cams they had that older breather style. which I changed to the newer style in my 01 ultra about 3 years ago. So do you know when Harley switch over to the newer style breather as I have a 2011 ultra 110 CVO now. cuz I know I could look in the parts manual to find out. but it might help others to know when they switched.

  • @chargerman426
    @chargerman426 Месяц назад +2

    So if you move to the "new" design are the bolts from the old design comparable? The new design appears to be a lot thinner than the old ones. Personally I like to rebuild the old style ones but understand that others would rather a new one piece design.

  • @dannymanny6917
    @dannymanny6917 Месяц назад +2

    Excellent. Thank you for the heads up.

  • @marks146
    @marks146 Месяц назад +2

    Great warning. Also, make sure the shop gives you the correct NEW screws. Don't use the old ones. The new breather boxes are much lower profile, and the old screws will push out the bottom of the holes as they are much longer than the new screws. You missed the opportunity to point that out.

  • @stevel7071
    @stevel7071 Месяц назад +1

    Thanks for another great video enjoy the holidays

  • @user-ss8ru8st2q
    @user-ss8ru8st2q 13 дней назад +1

    Thanks for the great tip doc!!

  • @dougfresh1341
    @dougfresh1341 Месяц назад +1

    Excellent Doc.

  • @michaelmcclendon2466
    @michaelmcclendon2466 Месяц назад +2

    Ty Doc good info Happy Christmas and have a great New Year keep your videos coning

  • @okiemale1589
    @okiemale1589 Месяц назад +2

    Thanks Doc...
    Thumbs up for the channel...
    😎👍

  • @nvpoolshooter
    @nvpoolshooter Месяц назад +1

    Excellent. This begs the question, what are the symptoms that your breathers need replacing?

  • @bradduffield9603
    @bradduffield9603 Месяц назад +1

    Great tip as always. Thanks Doc.

  • @davidscottcurtiscurtis775
    @davidscottcurtiscurtis775 Месяц назад +1

    I live near pig trail Harley-Davidson in ar. Greatly appreciate information on twin cams 04 fxti and I realy love it.

  • @whip-its_dad4239
    @whip-its_dad4239 Месяц назад +1

    That's good to know for sure . Thank you for your channel .

  • @thomasburns6559
    @thomasburns6559 22 дня назад +1

    Doc. Thank you for the tip when replacing the breather on the twin cam. I've been doing wrenching on Hd's for over 40 years . But never split cases and such. I have always found that there are always some kind of warning that never made it to the book. History info. The Flhs was offered in 1982. However in 1981 1600 were released to the public. How do i know? I had one. I didn't know its history till a few years after I sold it.😢

  • @DavidLattinville
    @DavidLattinville Месяц назад +2

    Thanks Doc that helps out a lot

  • @RodHog1
    @RodHog1 Месяц назад +1

    Great video thanks hope you had great christmas and happy new year

  • @johnsb1550
    @johnsb1550 Месяц назад +1

    I think I'm OK, but I'm definitely going to check that!
    I've always been able to thread those down all the way by hand

  • @Rockcityhooligan
    @Rockcityhooligan Месяц назад +1

    I have learned my lessons working with dirty holes, this is just another reminder to use thread chasers and shop air to make sure I don't go sticking my bolt in a dirty hole and end up paying the price.

  • @danbarrette9888
    @danbarrette9888 Месяц назад +1

    It’s all about the tricks when working on the Harley. Thank you.

  • @classicrider103
    @classicrider103 Месяц назад +1

    Probably would have never guessed that oil in a bolt hole would have created a problem. Now I'll be checking any and all bolt holes for any kind of debris before inserting a bolt.

  • @cameronbartley6139
    @cameronbartley6139 Месяц назад +1

    Wow that's crazy, the unknown....
    Thanks for sharing that,what a headache that could be.

  • @lemontier
    @lemontier Месяц назад +1

    Thanks Doc you are appreciated big time.

  • @eddybuckhalt8657
    @eddybuckhalt8657 Месяц назад +1

    Great tip! Thanks Doc!

  • @nhrider88
    @nhrider88 Месяц назад +1

    Thanks Doc. Another great tip.

  • @bluesriderDF
    @bluesriderDF Месяц назад +1

    What I have done is take some carb cleaner, put the straw in the hole, cover it with the cloth, then spray a couple times. Then do the same thing with compressed air. Covering with a cloth is important, so it doesn't go all over the place. This loosens up & blows out the oil, and everything should end up on the cloth.

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад +1

      That's a good trick. But I prefer Brake cleaner. Thanks for sharing….Doc

    • @bluesriderDF
      @bluesriderDF Месяц назад

      ​​@LowCountryHarleyDavidson Actually, now that you mentioned it, it is brake cleaner that I used. It's a terrible thing when your mind slips like a worn out clutch! 😅

  • @busabobsgarage9876
    @busabobsgarage9876 Месяц назад +1

    Thanks for this awesome tip!

  • @John-yr1sf
    @John-yr1sf 20 дней назад +1

    Excellent video. When would this service be needed, and does it apply to the twin cooled?

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  20 дней назад

      Yes it applies to Twin Cooled Twin Cams. When to replace depends on the bike….Doc

  • @Biker-Jim
    @Biker-Jim Месяц назад +2

    Well butter my biscuit Doc just taught this ol' dog something new...Thanks Doc

  • @johnhammered3321
    @johnhammered3321 Месяц назад +5

    Every bolt, when removed, needs the threads cleaned and dry before reassemble, including derby cover bolt holes! I can't tell you how many derby cover bolt holes I've seen stripped!😂

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад +1

      You're absolutely right. A little time there can save a lot of trouble….Doc

    • @geraldgoodiii6993
      @geraldgoodiii6993 Месяц назад

      Those derby cover bolts are soft as hell on the head. I think the torque specs are a little high for what they are tho.
      I’ve had one get stuck coming out and strip the head .. thread portion was fine it was the head that basically welded itself to the derby cover (not TECHNICALLY welded of course .. just stuck from riding hard in hot weather it got mad hot and that thing wasn’t turning at all.)
      Cut the head off with a little grinder and the threaded stud left was able to be pulled out with just my fingers (had a needed nose vice grip ready but wasn’t needed at all).
      I won’t reuse those bolts more than once (the one time I was cheap and let em ride for 3 primary oil changes .. I do every 4k with the oil and tranny .. cheap insurance

    • @johnhammered3321
      @johnhammered3321 Месяц назад +1

      @geraldgoodiii6993 58 years of riding and I've never stripped one. I've repaired many. The proper use and care of tools should provide many years of service. I think the issue is people have a tendency to overtorque when attaching or not properly preparing each screw and or screw hole as doc says. Most screws, bolts, and attachment points today are of aluminum and soft metals. Back in the old days things were made of iron and steel. They were more forgiving.

  • @alanwhiteside410
    @alanwhiteside410 Месяц назад +1

    Well now there’s a great tip!
    Thank you Doc.
    😎👍🍻

  • @flhrcanuck0927
    @flhrcanuck0927 Месяц назад +1

    Thanks Doc. Wondering why you didn't just hit the holes with air. Also curious how the DEI heat shield inserts worked for the officer. Cheers.

    • @LowCountryHarleyDavidson
      @LowCountryHarleyDavidson  Месяц назад

      My dear friend. Last week we posted the officer’s review. ( not everyone has a compressor for air assist)….Doc

    • @flhrcanuck0927
      @flhrcanuck0927 Месяц назад

      @LowCountryHarleyDavidson thanks. Missed the review. Will watch.

  • @duanehicks9806
    @duanehicks9806 Месяц назад +1

    In my opinion what I saw was the new one made the bolts longer! The old one was thicker making the bolt short the right length

  • @willtopower2158
    @willtopower2158 Месяц назад +1

    Always great information Doc, Merry Christmas and Happy New Year to you and yours!🎄

  • @patrickhelstrom1778
    @patrickhelstrom1778 Месяц назад +1

    Q-Tips clean them holes out thats an easy way or air or suction

  • @JamesHyde-tb8os
    @JamesHyde-tb8os Месяц назад +1

    Great word Doc!

  • @grahampawson1502
    @grahampawson1502 Месяц назад +1

    Brilliant tip doc, could save a fortune in repairs 🤙🏍👏👏

  • @graemejones7646
    @graemejones7646 Месяц назад +1

    Thanks heaps Doc!! Still a legend 🙌