Chapter 14 – Lower extrusions installed

Today was all about getting the lower engine mount extrusions installed.

I started off by checking the firewall to see if it was 90° vertical, which of course it wasn’t.

The front tire was really low, so by adding air to get if full, and adding one small piece of 3/8″ wood underneath, I got the firewall “zeroed” at 90°.

With my firewall dialed in at 90°, I then removed it and clamped the engine mount in place on the upper engine mount extrusions.

I then checked the plate that I bolted to the firewall last night.  With just a scant bit of downward pressure I can get it to my targeted 1.4° slant with no real difficulty.

Over the next couple of hours I then floxed in the 2 WA16 Spruce wedges and covered both of those –respectively– with 2 plies of BID that covered the entire WA16 and overlapped onto the sidewall, spar and back seat.

I then added the remaining plies of BID to the lower engine mount extrusion pads, 9 plies on the left and 8 plies on the right.

Here’s a pic of the right side WA16 floxed in place with the associated BID laid up in place.

And here’s the same on the left side.

I then slathered up the just glassed BID pads with copious amounts of flox, applied fresh epoxy to the mating surfaces of the lower engine mount extrusions, and then set & clamped them into place on each side.

I then used a pre-cut 2×3 with a wedged 2×4 to keep the forward side of the lower engine mount extrusions pressed up tight against the BID pads.

I then double-checked that all the dimensions were good.  Here’s the right side lower engine mount extrusion in place.

And the left.  As you can see, I peel plied all the BID pad edges that were lined with flox for a nice smooth edge.

Here we have the installed lower engine mount extrusions, shown from the left side.

And the same thing again from the right.  It took me about 6 hours total to finish this step.

Tomorrow I’ll drill the holes through the lower engine mount extrusions to then bolt each on to the CS spar and lower longeron piece.


Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.