How do I?

Reply

  #1  
Old 03-21-03, 12:51 PM
Member
Thread Starter
Join Date: Dec 2000
Location: PA
Posts: 117
How do I?

I have a couple of small engines with stripped screws/bolts. (cursed hand me down equipment) How do I fix these?

One in particular is a head bolt on a 7.5 hp tecumseh engine with an L shaped setup (valves offset from the piston).

I replaced the head gasket cause I thought it was bad and causing an oil leak, but when I put all the bolts back in I coudn't torque one down properly, so it's stripped. The problem is that the HOLE is stripped, not the bolt. How do I repair the threads - do I need to buy a larger diameter bolt once I repair the threads - where the heck do I get a larger diameter bolt?

I have seen tapping sets before but never got any hands on actual experience.

Please help. (and describe as much as possible including what the tap sizes mean, where to get the equipment and the parts I'll need afterward etc.)

Thanks a bunch.
 
Sponsored Links
  #2  
Old 03-21-03, 01:23 PM
slumlordfrank's Avatar
Member
Join Date: Mar 2003
Location: Where time and space begin
Posts: 702
stripped threads

You could try a Heli-Coil repair, auto parts store should have it. Essentially you drill the hole slightly larger, then insert the "coil". The coil is the new threads in the engine.
I'm not sure what you mean by the sizes on the taps, but from simplest to most complex they are; Diameter and thread pitch, such as 3/8-16 is 3/8" diameter and 16 threads per inch. 12 X 1.5 means 12 mm diameter and 1.5 mm from thread crest to thread crest. The other numbers refer to "class of fit, ie; how tight the fit is between the bolt and nut, or in your case between the bolt and casting.
I'm sure some of the guys still in the trade will add to this.
Let us know how it comes out.
slumlordfrank
 
  #3  
Old 03-21-03, 07:49 PM
Tcumcman
Visiting Guest
Posts: n/a
Thread Repair

Heli-Coils work GREAT....as long as they are
installed correctly. FOLLOW INSTRUCTIONS and
you should be OK with that as a repair.

Tcumcman
 
  #4  
Old 03-22-03, 12:49 AM
cheese's Avatar
Forum Topic Moderator
Join Date: Jul 2001
Location: USA
Posts: 16,814
I agree...Heli-coils will do the job when installed properly. I have seen them at autozone. Make sure you get the proper size....take your bolt to match it to the set.
 
  #5  
Old 03-24-03, 04:56 AM
Member
Thread Starter
Join Date: Dec 2000
Location: PA
Posts: 117
THANKS!

Thanks for the info. I'll get to the auto parts store this week and see how it goes.

I'll post my results in a week or so.

Thanks again.
 
Reply

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Thread Tools
Search this Thread
Display Modes