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Proper Size Hilicoil for Thread Repair

 
  #1  
Old 07-14-2019, 07:53 AM
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DavidStiebel
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Question Proper Size Hilicoil for Thread Repair

Gentlemen,

I need a bit of help,

I have stripped the threads from a rocker arm bolt (not sure how but the threads came out with the bolt !??!).
Now I need the proper bolt and thread size in writing. The manual calls the rocker arm bolts "bolt" with no definition like 1/4, 3/8 ths, 5/16 ths etc so I am not sure what size or thread type this is.

I intend to add a Hilicoil insert to fix the issue but can not walk into the shop without some knowledge of the size I need.

Does anyone know the proper size?

I could walk into the shop with the bolt but they will ask what size I need? so its best to educate myself before I go in.

Regards to all,
David
 
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Old 07-14-2019, 09:57 AM
Madnss
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Originally Posted by davidstiebel View Post
gentlemen,

i need a bit of help,

i have stripped the threads from a rocker arm bolt (not sure how but the threads came out with the bolt !??!).
Now i need the proper bolt and thread size in writing. The manual calls the rocker arm bolts "bolt" with no definition like 1/4, 3/8 ths, 5/16 ths etc so i am not sure what size or thread type this is.

I intend to add a hilicoil insert to fix the issue but can not walk into the shop without some knowledge of the size i need.

Does anyone know the proper size?

I could walk into the shop with the bolt but they will ask what size i need? So its best to educate myself before i go in.

Regards to all,
david

5/16
 
  #3  
Old 07-14-2019, 01:04 PM
shanneba
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You can view/download the 2008 Sportster Parts Manual at the Harley Service Information Portal for free-
https://serviceinfo.harley-davidson....cle/lookupForm


Here is the 2008 Sportster Parts manual-
https://serviceinfo.harley-davidson....2008+Sportster

Find the part number for your bolt, then search the document for the part number.
The last (normally) hit on the part number will usually give the bolt/nut type and dimensions.
These are listed in the Hardware List of the manual.

1039 SCREW 5/16-18 X 2-1/2 hex flange head (Grade 8)
 
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Old Yesterday, 10:41 AM
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As someone who has owned a machine shop for 45 years and have installed hundreds of HeliCoils, if you walk into a "shop" and they can't identify the size and pitch of a bolt, RUN AWAY.
 
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  #5  
Old Yesterday, 01:28 PM
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Although helicoils are often used as repairs, that isn't their intended use. There are other brands of repair inserts available, which may be more suitable. I certainly suggest finding a competent local shop who does thread repairs and ask their advice. On my shovelhead, many years ago now, I suffered two stripped threads in my heads, neither of which was suitable for an insert and had them welded up and rethreaded - with helicoils!
 
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Old Yesterday, 11:35 PM
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Thank you for the information and the links, to me this is a new resource, I will pass it forward when I can.
Regards.
 
 


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