Jump to content

Unofficial Home of Old Simplicity & Allis-Chalmers Garden Tractors

Sign in to follow this  
Simplicity_728

Head bolt issue

Recommended Posts

Simplicity_728
Hi everybody. I've been having a problem with the head bolt by the exhaust valve staying tight. It did strip and I installed a Helicoil in it and after a week it is loose again and will not tighten. Anybody know what to do next?

Share this post


Link to post
Share on other sites
Simplicity_728
Thanks for the link Ray. I just got it put back together. I stacked two Helicoil's on top of eachother and torqued it down, seens to grab alot better so we'll see how it holds

Share this post


Link to post
Share on other sites
steve-wis
I use the ones Ray refers to all the time, much preferred over helicoils. They are actually called keen serts if you want to look up info on them. One thing to know about keen serts is that when you open up a hole to install one, you don't use the standard drill for the tap, you use a bigger one. The thread on the outside of keen serts isn't cut to a standard depth, not sure why they do that. You can find charts online to give drill sizes for different size inserts, or usually the inserts have a paper in with them giving the drill sizes. Helicoils aren't bad for an application that you tighten once and leave alone, but if it is an application where you often take out the bolt, the helicoil will eventually unscrew out of the hole, which is why I prefer keen serts. http://www.newmantools.com/kee.htm Hope this helps! Steve

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

Sign in to follow this  

  • Who's Online (See full list)

    There are no registered users currently online

  • Today's Birthdays

    1. davidmoll
      davidmoll
      (61 years old)
    2. Mikethemasher
      Mikethemasher
      (50 years old)
  • Recent Status Updates

    • SonOfCreepfeed

      SonOfCreepfeed

      Thinkin' about this old girl.

      · 1 reply
    • Dean McFadden

      Dean McFadden

      Good morning peeps! I’m always searching for helpful information with my AC collection. Hope to find out new information and pass on my own experience in restoration. Here are some pics of my babies. I’m still looking for front rims for the 410 so yesterday I put the 310 wheels on took it for a drive. Working pretty good but still needs some carb work. Gotta get the 310 running next. Have a great day!😁
       

      · 1 reply
  • Adverts

×