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Technical *****HELP ****harmonic balancer / crankshaft

Discussion in 'Traditional Hot Rods' started by HellsHotRods, Jan 31, 2014.

  1. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    I have this 327 Chevy that has no threads in the end of the crank to help assist in the installation of the harmonic balancer. Does anyone have any idea how to get the harmonic balancer back onto the crank without using a hammer??? I took it off to change the camshaft.
     

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  2. titus
    Joined: Dec 6, 2003
    Posts: 5,078

    titus
    Member

    block of wood and hammer, or drill and tap the crank snout, when ever i sent early sbc cranks out to get groundi had them drill and tap it. sounds crude but it is what it is.
     
  3. GOSFAST
    Joined: Jul 4, 2006
    Posts: 254

    GOSFAST
    Member

    You can heat the hub in oil hanging in a coffee can on a small electric heater and you should be able to "slide" it on by hand. We do many this way to this day even though we have all the correct tools to install them. The outer ring doesn't get all that hot but I would use some gloves. Should go right on!!

    You don't have too many options available without the crank threads tapped??

    Thanks, Gary in N.Y.

    P.S. Of course you could drill & tap the crank snout but that's difficult in the vehicle.
     
  4. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    Thanks Jeff !! I was thinking I was going to have to drill and tap it. Hammer might be bad on thrust bearings
     

  5. That's what I said to the guy managing the the shucks that told me to hammer it and insisted thats how they did it and that he was a former GM master tech...
     
  6. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    Motor is out. On engine stand.
     
  7. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    Gary - what kind of oil do you heat the hub with. I understand your method. Thanks!
    Dave
     
  8. 3wLarry
    Joined: Mar 11, 2005
    Posts: 12,804

    3wLarry
    Member Emeritus
    from Owasso, Ok

    I've built many 283/327's in my life, and the machine shop owner told me to do the block of wood and a 4lb sledge hammer dance...always worked great.
     
    kidcampbell71 likes this.
  9. F-6Garagerat
    Joined: Apr 12, 2008
    Posts: 2,652

    F-6Garagerat
    Member

    You are supposed to heat them. It's in an early chevy service manual I have. Put mine in the oven on 250 for about 20 minutes or so. Crank was room temp.
     
  10. olscrounger
    Joined: Feb 23, 2008
    Posts: 4,341

    olscrounger
    ALLIANCE MEMBER

    Heat it up as they have said--tap it on-but I have put on several with the block of wood and hammer too. If it is on a stand you should be able to drill and tap it-have seen quite a few early ones come loose.
     
  11. stimpy
    Joined: Apr 16, 2006
    Posts: 3,547

    stimpy

    I would drill and tap since you have it out , a dampner coming loose/off is not a fun thing to have happen .
     
  12. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    Thanks for the all the suggestions and help, I really appreciate it.

    I'm wondering if I could attempt to just heat up the hub / snout with a rosebud tip and then slide it on? I don't have an oven or hot plate at my shop.

    It was on pretty good when I pulled it off, somebody was running it in a Corvette the way it was. It's a Corvette block and heads.

    Thanks again !!!!
     
  13. dave lewis
    Joined: Dec 12, 2006
    Posts: 1,373

    dave lewis
    Member

    HHR...it's no big deal to drill the crank..
    I have done many...
    The pic shows the center clearly..
    Go buy a good 7/16" fine thread tap from fastenall..and a good quality bit from them also..
    The drill motor needs to be a heavy duty SLOW speed ...like a 1/2" Milwaukee hole hang AKA wrist breaker..
    Get a # 945 mister gasket bolt kit, it comes with the thick washer..
    Drill it slow, use lube....no problem !
     
  14. fatkoop
    Joined: Nov 17, 2009
    Posts: 712

    fatkoop
    Member

    The center of the crank is not hard. You can easily drill and tap it, especially when the engine is on a stand. I think this is way preferable over driving it on with a hammer, although in my youth I remember doing it that way.
     
  15. HellsHotRods
    Joined: Jul 24, 2009
    Posts: 1,354

    HellsHotRods
    Member

    I'm going to drill it tomorrow. I have these aircraft drill bits that cut through anything like butter. I have a 7/16 tap, plenty of taps, i bought out a huge chest full of taps/dies from an old machinist guy.

    I got these aircraft drill bits from an old aircraft surplus store. From what I know at Boeing, most bits get used a day or two and then chucked out for surplus. They are 8" long ++ but cut amazingly.
     
  16. pasadenahotrod
    Joined: Feb 13, 2007
    Posts: 11,776

    pasadenahotrod
    Member
    from Texas

    Wood block and a hammer and TAP-TAP-TAP. Nothing hard about that.
     
  17. 3wLarry
    Joined: Mar 11, 2005
    Posts: 12,804

    3wLarry
    Member Emeritus
    from Owasso, Ok

    I wouldn't use a rosebud because the dampener is a 2 piece unit with rubber sandwiched between the two...just my 2 cents.
     
    kidcampbell71 likes this.

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