1. Husqvarna Motorcycles Made In Sweden - About 1988 and older

head bolt

Discussion in 'Vintage/Left Kickers' started by ct cr430, Apr 16, 2015.

  1. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Anyone else have this problem ? Last night I was putting the head back onto an 81 cr430 and ran a into a problem . Previous owner had inserted a helicoil and it's pulling out . Any suggestions ? I might be able to remove old helicoil and reset new one lower . Maybe time sert or or maybe fill the hole , drill and retap . Just want to get it right .
  2. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    it shouldn't pull out. Is the stud threaded deep enough in the case? Do you know if they are metric ?
    I seen people do silly things. I wonder if he installed the wrong size helicoil? The wrong width thread insert.
    That's the only way I could see it pull out. Is the material in the case solid and not corroded or soft?


    When I was building the 155mm howitzers for the U.S. army everything was helicoiled. We used a lacquer paint to glue the helcoiled in the threaded holes. I never seen them pull out.
  3. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    I'm having the problem with the small bolt that threads in over the exhaust port . Not much room between the hole and the liner . The 4 studs are good and the other bolt over the intake , those I can get to torque down without any problems .
  4. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    Is the bolt too long? If it bottoms the helicoil may pull up.

    There is a installation tang on the bottom of the helicoil that were suppose to break off once the helicoil is installed. Then remove it from the hole.

    Is it metric or English thread?
  5. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Bolt doesn't bottom out . Measured depth of hole vs length of both that protrudes from under side of head without washer to make sure . The installation tang seems to be gone , probed around in hole with a pick . Helicoil visually moved , now near top of hole . Should be able to grab it and try to remove . If I have the clearance thinking about trying a time sert . Getting opinion's and ideas before I process , don't want to make it worse .
  6. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Previous owner helicoiled hole to 5/16 18 . 8mm bolt is slightly larger but is 1.25 pitch . Trying not to lose whatever metal I have available to repair this . The bolt hole over the intake has also been helicoiled but does torque down without issues , maybe front hole over exhaust was affected due to heat , not sure on that . Maybe just previously bad install of helicoil .
  7. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    Your using a 5/16-18 bolt right?

    If your worried about the bolt and heat there are dorman products that offer like exhaust manifold bolts.
    The older automotive parts houses carry the dorman products. Or search online. There not expensive.
    Fix it once and forget about it.

    Or go with a grade 8 bolt.
  8. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Not worried about the bolt any the heat just trying to figure out best plan of attack to repair threads of the hole in the cylinder that the front head bolt over the exhaust port . Heat may have contributed to the helicoil or the metal the helicoil was threaded into . It's pulling out of the cylinder . Somehow those threads will have to be repaired before the head can be installed again .
  9. grouty Auto Lover ...

    Location:
    South West UK
    Husqvarna Motorcycle:
    78 390WR, 78 390 AMX, 500 Humph
    Other Motorcycles:
    works 73 CCM 520, another 73 CCM520
    I know it's a pain, but your best bet is to remove the cylinder and take it to an engineering shop that knows what they are doing with helicoil inserts.
    There are many types out there in the market. The shop should be able to remove the old incorrect one and bore the hole larger and fit the correct M8 coil with an oversize O.D.
    It is worth doing it right.
  10. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    I agree , it is worth doing it right ... and the first time . I just don't want this to be an ongoing problem . The one big problem with this is it's location to the liner , not much left . A friend is suggesting a TIME SERT , just don't know about clearance . Thanks for the suggestion about a machine shop , I would just need to find a good 1 that I could trust . I just hope this is a one shot deal to do it right and have it be wrong .
  11. Bigbill Husqvarna
    Pro Class

    Husqvarna Motorcycle:
    '83 250wr
    Other Motorcycles:
    0 right now
    You can use a pointed pic to pull the helical out. Start to unwind it with a pic then a pliers will unwind it slowly. I've pulled and replaced delicious before.
  12. SteveJ Husqvarna
    AA Class

    Location:
    New Mexico
    Husqvarna Motorcycle:
    1970 400 Cross, 1983 500 CR
    Other Motorcycles:
    84 Honda CR500R, 81 Honda CBX,
    I have used Time Sert as well as their oversized insert, known as a Big Sert (used to repair your type of situation). I have also used Heli Coil many times in various applications I find the Time Sert is much better than the Heli Coil in these engines, due to it being a solid machined insert. On the Time Sert website, there is a link to their engineering dimensions, you may be able to get some idea as to whether you have enough room for the oversized Big Sert.
    Hope it comes out well for you.
  13. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Right now the coil is just at the top edge and was able to get it off the top thread . Haven't tried to remove yet , just waiting to see how I decide to do this . Glad to hear SteveJ recommend this also , I'm not going to rush this . Like the old saying measure 2x , cut once . Don't want to replace cylinder or pull sleave and try to have welded just looking for alternatives . Has anyone tried a time sert in this location ?
  14. Joe Chod Husqvarna
    Pro Class

    Location:
    upstate NY
    replace it and Never torque those bolts until the 4 studs are done
    Often why the bolt holes fatigue is it is aluminum for the stand alone bolt holes and to torque to even 27 pds wears on the aluminum after years. There are people out there who do things wrong.
  15. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Always would torque 4 nuts on the studs 1st . Then the 2 smaller bolts to 14 lbs as per spec . Or does anyone recommend less on these 2 bolts ?
  16. stormer254 Husqvarna
    AA Class

    Location:
    England
    Husqvarna Motorcycle:
    More than I dare let her know
    Other Motorcycles:
    Yes!
    AJS Stormer head has the same bolt head layout but they use studs in to the alloy, loctite them in and you only ever undo the nuts!
  17. ct cr430 Husqvarna
    AA Class

    Location:
    Connecticut , litchfield county
    Husqvarna Motorcycle:
    1981 cr 430
    Other Motorcycles:
    2007 honda crf450
    Didn't think of that one , I will remember that .
  18. 84scrambler Husqvarna
    Pro Class

    Location:
    mid Florida
    Husqvarna Motorcycle:
    87 xc 250, 85 wrx 250, 79 wr 250
    Is the torque rating different on different size engines ? or is there a rule of thumb number you guys shoot for?
  19. grouty Auto Lover ...

    Location:
    South West UK
    Husqvarna Motorcycle:
    78 390WR, 78 390 AMX, 500 Humph
    Other Motorcycles:
    works 73 CCM 520, another 73 CCM520
    I just go with what the manual says. I always reckon that the Husqvarna R & D department know more than me. So far in my 42 years of riding and building bikes that has been the case. One or two tricks picked up on the way, but they still know their stuff.
  20. Crashaholic Husqvarna
    Pro Class

    Location:
    Antelope Valley, CA.
    Husqvarna Motorcycle:
    73 450WR 6spd motor in a 75 MK frame