ORIGINAL: Barry Cazier
bubbagates...
The way yours are done is different than mine. My standoffs have threads at both ends. You use 4 shorter screws on each end. However, after looking at yours I may drill my standoffs clear through and install it that way. Looks nice.
Another way I thought about is to run a piece of aluminum between the screws on the firewall side. I had locktite and about 1/2" diameter washers with a step down washer and a lock washer. But I'm pretty sure it came loose on the wood side. I didn't use "blind nuts" in im installation. Yours looks better. I may change.
Thanks
Barry
I use RED locktite on the forward screws (the ones that attach the engine to the standoffs), along with material called Torqueseal or Torquestripe, and I drill holes through the aft screws (the ones that go through the firewall) and safetywire them in place - never, EVER had a single problem with the engine coming loose! I also drill six 1/8" holes around the 1/4" holes in the firewall and glue some 1/8" dowel into them and sand them flush. This prevents the wood from crushing when you tighten the bolts. That is most likely the key cause to your bolts starting to come loose in the first place - you can thank that cheesy chinese ply for your misfortune!