ENGINE INSTALLATION. Engine Attachment to Firewall

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I balanced the fuselage left to right and mounted both cowls to mark the center on the floor with a plumb. I marked the center height on a straightedge for reference. I used weights and marked the floor to keep the fuselage from moving and removed the cowls. With the help of an engine hoist, I aligned the engine–engine mount assembly against the firewall, plumbing the center of the engine and the proper height marked on the straightedge. With everything in place, I drilled the top hole on the firewall and ran a bolt through it. I did the same with the rest of the bolts and temporarily tightened them with extra washers so that I did not have to tighten the nuts all the way. At this point, I placed weight on the nose and relieved the crane to avoid the fuselage from tipping.

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