ORIGINAL: jaka
Hi!
I never use Loctite on my engine bolts!
Been flying for 34 years.
If you tighten your bolts properly and use blind nuts on the back of the fire wall (which you should ) you do not have to use blue Loctite.
Neither do you have to use Locktite when you mount the engine to the engine mount.
Beware that Loctite destroys plastic mounts. For mounting engines to a plastic mount I use either metal screws or drill and tap my mounts.
You can also just drill the mounts and use lock washer nuts but it's nearly always difficult to reach them if you have a tight cowled in engine.
I much prefer this method over using nuts and bolts. It really only works well in metal mounts though.If oneuses a taper tap for plastics or Glass reinforced mounts andyou don't go all the way through with the tap, you can create a "tight" thread that grips the bolt nicely. But this isn't my own personal preference.
I've been using the DuBro anti-vibration mounts lately and like them a lot.
I prefer shanked,stainless, cap-head bolts with allen key heads with a plain and spring washer. In an ideal world HT bolts would be the order of the day, but stainless looks so much better. The shank avoids marking of the engine bearers by the screw thread. The cap head allows you to get at the engine mount from one side only, with a narrow tooland on some models with tight installations it's the ONLY way to get the enginein and out.