Update on fuel leak fix. I did a test today on the Poly-Nuts and they
are not up to the task. Placed a scrap piece of aluminum in the vise
and drilled three holes. Installed Poly-Nuts with puller, then snugged
them down a bit more with wrench. They might tighten up enough to seal
but I installed a bolt from the back side and bottomed out the threads
to duplicate removing a bolt some day if the threads seize up. I set
the torque wrench to 72 inch pounds, thinking that is a pretty low
setting (6 foot pounds) and the Poly-nuts spun easily just as several
predicted.
So, that fix is out. I want to proceed through my other possible fixes
in a manner as to not eliminate the easiest and cheapest fixes as I move
to more aggressive solutions without taking a saws-all to my fuel tank
. These are the order I see possible.
1. Go to metric and tap. It seems I'd have to go to a 5.5mm to get the
thread depth I'd need without enlarging the hole too much. 5.5MM bolts
special order? Local hardware store does not carry decimal sizes.
2. Question. would the Helicoil be as effective as the Keenserts in this
application? What thread size is the outside of the 3/16 insert and
would there be enough threads in the hole to hold? Can I drill the
threads out of present holes and have enough material to thread a 3/16"
Helicoil? I can get Helicoil kit with 12 inserts, tool, and tap at the
local auto store. Keenserts availability? I'd like to get flying again
this weekend.
https://www.oreillyauto.com/detail/b/heli-coil-3878/tools---equipment-16488/hand-tools-16814/cutting---drilling-tools-16542/thread-repair-16906/heli-coil-inserts-19596/ecce6617012f/heli-coil-10-32-inch-sae-thread-repair-kit/55283/4368725
3. Go to 1/4" bolts and Helicoil
I've spent the price of 6 gallon of 100LL without results. I see the
next fix try being the same. That's two hours of flying in the KR, 300
miles. I hope this fix doesn't go like taxes, just keep going up with
nothing to show for it.
No speculation please unless you know what you're talking about. And
I thought this was not going to be brain surgery.
Larry Flesner
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