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Mikes RV-9A Web Site
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Date: 7-27-2008
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Number of Hours: 3.00
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Manual Reference:
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Brief Description: Mounting the engine
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Mounting the engine was much “trickier” than I anticipated and fortunately Dick Scott was available to lend an extra set of hands… and someone to share 4 letter words with!
Because the engine mount holes are compound angles inward, the only place all 4 bolts align is when they are all torqued in place. Of course nothing lines up during the bolt placement. With the engine suspended in front of the mount, we started with the bottom two bolts. Once those were in place enough to start the nuts, we moved to the top mounts.
We slipped the rubber isolators into the mount donuts, then lifted the engine, which rotates the top “into position”. “Into position” is actually a VERY loose description! Now it was time for a third bolt. Dick & I pushed, pulled, yanked, twisted and even embellished with a few four letter words, but the bolt would only go into the mount by “screwing” it through the engine case boss. Not an ideal situation, but the threads came through fine. (When looking at the engine mount boss holes, it was obvious this was a “normal” evolution).
The 4th bolt was “Mission Impossible” personified! As we wrestled with what to do, I told Dick that I was thinking something was wrong… perhaps this engine and mount were not compatible. I didn’t have a hammer big enough in the drawer to make that last bolt go in!!
It was time for the “engineer’s hat”. What we needed was a way to at least get the mount, dampener set and engine case boss on the same line. I dug out one of the Lowes Aircraft bolts that I used for mating the wing spars to the centersection and ground the end to a long taper.
Once we had the taper pin inserted through all the components, Ray Peabody drove up and asked what he could do to help. I said, “We’ve tried everything to get these blankety blank bolts to go in and I’m thinking praying would be good”!
The idea of using the taper pin was that if we could torque the 3 bolts that are in place, then the engine would pull into place and all the stars would align. So that’s wh
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Hoisting the engine into place
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Working the top vib isolators in place
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Taper pin to align the 4th hole
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