How to fix a stripped hole (Pics)
by: toddmaples - Nov 2, 2014 13:20:32 GMT -5
scooter and katastroff like this
Post by toddmaples on Nov 2, 2014 13:20:32 GMT -5
If you have stripped an exhaust stud hole, here is the quickest and easiest method I have found to fix it. This technique is also a must for anyone that will be pulling their exhaust often.
You will need the following materials:
-Head gasket
-Drill
-Drill bits
-EZ-Lok inserts sized for application (Available through Grainger)
-Tap set sized for inserts
-Vice/Workbench
The first step is getting the head off of the engine. This can be done with the engine still inside the frame fairly easily. Once you get the head off the engine you can back the old studs out using the jamb nut method.
Once the studs are out of the way you can begin drilling. Take care not to drill too deep. I usually drill about 1/16"-1/8" deeper than the height of the insert for a flush mount application such as this.
The next step will be to tap out the hole for the insert. It is possible to do this without an entire tap set, but the holes will need to be drilled deeper for tap clearance. I will usually tap a little ways, then screw in the insert to test how deep it sets, if its not deep enough I retap the hole a little deeper and check until desired height is achieved. Picture shows checking the insert set height. Use thread lock compound for final install.
Once the inserts are in and set you can grind/sand off anything above the mating surface that would interfere with good contact. I cannot stress this enough, CLEAN THE PART VERY WELL before replacing it in the engine. Aluminum shavings do NOT belong in an engine. Also make sure to use a new head gasket, these are not meant to be reusable.
This technique for fixing/improving bolt holes on these scooters can be applied almost anywhere. I have used this technique to also fix stripped head bolt holes.
You will need the following materials:
-Head gasket
-Drill
-Drill bits
-EZ-Lok inserts sized for application (Available through Grainger)
-Tap set sized for inserts
-Vice/Workbench
The first step is getting the head off of the engine. This can be done with the engine still inside the frame fairly easily. Once you get the head off the engine you can back the old studs out using the jamb nut method.
Once the studs are out of the way you can begin drilling. Take care not to drill too deep. I usually drill about 1/16"-1/8" deeper than the height of the insert for a flush mount application such as this.
The next step will be to tap out the hole for the insert. It is possible to do this without an entire tap set, but the holes will need to be drilled deeper for tap clearance. I will usually tap a little ways, then screw in the insert to test how deep it sets, if its not deep enough I retap the hole a little deeper and check until desired height is achieved. Picture shows checking the insert set height. Use thread lock compound for final install.
Once the inserts are in and set you can grind/sand off anything above the mating surface that would interfere with good contact. I cannot stress this enough, CLEAN THE PART VERY WELL before replacing it in the engine. Aluminum shavings do NOT belong in an engine. Also make sure to use a new head gasket, these are not meant to be reusable.
This technique for fixing/improving bolt holes on these scooters can be applied almost anywhere. I have used this technique to also fix stripped head bolt holes.
