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Thread: Splitting cases on 350x

  1. #16
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Should I test a new nut for the specified torque after I use a die on it befor I go any further? I dont want to get the cases back together and find out it wont hold.

  2. #17
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    Quote Originally Posted by DDQ View Post
    Should I test a new nut for the specified torque after I use a die on it befor I go any further? I dont want to get the cases back together and find out it wont hold.
    I know I would because that's just my luck



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  3. #18
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Well there is the problem right there..

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  4. #19
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Is there a chance amachine shop can fix it or should I buy a used crank off ebay?

  5. #20
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    I think you will be ahead of the game if you just find a new bottom end and save your existing unit for parts


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  6. #21
    DDQ's Avatar
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    I measured the threads at 20mm but can anyone tell me the pitch?

  7. #22
    AMK's Avatar
    AMK is offline At The Back Of The Pack Arm chair racerFirst time rider
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    Quote Originally Posted by DDQ View Post
    I measured the threads at 20mm but can anyone tell me the pitch?
    If you dont get it before I get off work I'll get it for you.
    The bad thing is though, once the material is gone in those threads a die will only remove more.
    Your tightening strength is severely compromised. You can't use normal torque and it may come apart at a very inconvenient time and place.
    Alan



    1985 350x
    1984 200es Big Red
    1985 200s (little red)
    1986 200x saga
    2) 1985 350x projects
    And a slew of others to hold my attention

  8. #23
    DDQ's Avatar
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    Can a machine shop do anything to add material back? I dont see any complete bottom ends on ebay with a claimed working crank and trans.

    I do see some cranks for around $60-$80 that are described as 'working' so I may just do that.

  9. #24
    AMK's Avatar
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    A machine shop could do that but the cost might be prohibitive compared to another crank. And they would really have to know what they're doing.
    Last edited by AMK; 01-29-2018 at 10:18 AM. Reason: Punctuation
    Alan



    1985 350x
    1984 200es Big Red
    1985 200s (little red)
    1986 200x saga
    2) 1985 350x projects
    And a slew of others to hold my attention

  10. #25
    DDQ's Avatar
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    I am pretty sure this is the die I would need but its half the cost of a used crank.


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  11. #26
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    Quote Originally Posted by DDQ View Post
    Can a machine shop do anything to add material back? I dont see any complete bottom ends on ebay with a claimed working crank and trans.

    I do see some cranks for around $60-$80 that are described as 'working' so I may just do that.
    Yes but you'll score a good used crank for less than the cost of that kind of repair considering how much trouble it is to weld correctly while not affect the hardness of the crank shaft

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  12. #27
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    AMK is offline At The Back Of The Pack Arm chair racerFirst time rider
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    As I see it these are your 3 choices...

    1) buy that die and rethread what you've got and further compromise its integrity. And revisit this repair with much more cost.

    2) have a machine shop turn the old threads off, heat part to build up with Nickel rod. Re-turn stub and rethread. Then re-heat treat to its original hardness. All at $90.00+ per hour.

    3) buy a good used crank.

    I'd buy a good used crank and be done with it for 30 more years.
    Last edited by AMK; 01-29-2018 at 11:30 AM. Reason: Not 100% sure on the $90.00 per hour.
    Alan



    1985 350x
    1984 200es Big Red
    1985 200s (little red)
    1986 200x saga
    2) 1985 350x projects
    And a slew of others to hold my attention

  13. #28
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Thanks for the advice. I just made an offer on a crank on ebay.

  14. #29
    DDQ's Avatar
    DDQ is offline At The Back Of The Pack Arm chair racerAt the back of the pack
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    Crank is on the way so I will continue the tear down to see what is up with the trans.

  15. #30
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    Didn't read all the posts but if you didn't already figure it out that nut has backwards threads, it turns right to take it off, not lefty loosey!

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