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Jaybannist(at)cs.com
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 Posted: Tue Jun 27, 2006 3:16 pm Post subject: XL engine mount fittings |
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The engine mount fittings in my kit are partially fabbed, with the welding done and the holes for the canopy hinge drilled. However, the holes for the 3/8" bolts that penetrate the firewall are not drilled. I can't find any guidance in the manual nor in the drawings for locating these holes. In fact, the photos and some of the drawings show a different fitting than the one supplied, and the photos show the bolt welded to the fitting. Confusion reigns, so any assistance will be appreciated.
Jay in Dallas, working on XL fuselage
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armyret(at)mchsi.com
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| Posted: Tue Jun 27, 2006 4:48 pm Post subject: XL engine mount fittings |
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Jay- Check out page 6B7 for exact location of all 4 holes. Regards- Al Young
[quote] ---
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Jaybannist(at)cs.com
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| Posted: Tue Jun 27, 2006 5:20 pm Post subject: XL engine mount fittings |
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Page 6B7 clearly locates all the holes in the firewall. I drilled them a long time ago. I still don't know where to drill the holes in the fittings.
Jay in Dallas
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JAPhillipsGA(at)aol.com
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| Posted: Tue Jun 27, 2006 5:50 pm Post subject: XL engine mount fittings |
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Jay, on the bolt locations. I assume these are the bolts that go through the firewall that your steel engine mount attach to ? The placement of them are critical because if they are off even a little the mount won't fit. That being the case, when I was at that point I had already selected my engine and ordered an engine mount. I used it to ensure the bolt location was correct. Best template for perfect placement is the mount you intend to hang your engine on. Hope we are talking about the same thing. Best regards, Bill of Georgia
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craig(at)craigandjean.com
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| Posted: Tue Jun 27, 2006 6:42 pm Post subject: XL engine mount fittings |
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I asked Zenith the same question about firewall bolts back in February:
<I wrote>
My second question is about an apparent redesign in this area on some kits. In photos of the firewall on these kits I see the head of a bolt facing forward instead of the threaded stud with a nut. Is this a modification from the factory or a change by some builders? If this is a factory change can you tell me why the change was made? Also is the nut welded to the bracket or just held with a wrench during assembly?
<Zenith replied>
Installing the nut on the engine side of the firewall, will make the nut more accessible for installation.
So they didn't really say what was going on. But I have a theory. As you may know Zenith shows two different kinds of motor mounts: ones with washers/plates that bolt to the firewall with a short bolt (Rotax, Jabiru, Continental and conical Lycoming). The other style of motor mount has a tube about 1.75 inches long through which the firewall's bolts pass through (Lycoming dynafocal and William Wynne's Corvair mount). I suspect that with the quick-build kit they do not want to have to build long-bolt and short-bolt fuselages.
-- Craig
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