Long-EZ Lycoming O290

[Cesar]

Hi to all! Where can I found the Long-EZ manuals? I’m looking for the P/N of the four bolts that attach a lycoming  O 290 engine to the mount. Is a conical mount. Regards!

[Kent Ashton]

1 hour ago, Cesar said:

Hi to all! Where can I found the Long-EZ manuals? I’m looking for the P/N of the four bolts that attach a lycoming  O 290 engine to the mount. Is a conical mount. Regards!

I am not sure the manuals show what you want (the bolts).  It would be in Plans Section II but that did not show the engine, only the suggested firewall arrangement and the mount.   Here is the engine parts manual

https://www.lycoming.com/sites/default/files/O-290-D Parts Catalog PC-102-1_0.pdf

but it shows the rubber bushings but not the bolts.  They are standard AN 8 (1/2") cad-plated bolts with a drilled shank sold many places but you will need to measure the length.   You will need the wide washers shown in the parts manual (a standard washer), castellated nuts and you might need some thick and thin washers and cotter pins.    I saw your post on FB.  What are you going to do with a kind-of Dynafocal engine mount and an engine that uses conical mounts?  I don't see a good way to combine the two.

https://www.aircraftspruce.com/catalog/hapages/an8.php

Edited October 18, 2018 by Kent Ashton

[Cesar]

Don't worry, I'm going to replace the mount for the correct one. 

[Cesar]

hace 17 minutos, Kent Ashton dijo:

I have a link for the EZ manual but will have to find it.  The engine manual

https://www.lycoming.com/sites/default/files/O-290-D Parts Catalog PC-102-1_0.pdf

shows the rubber bushings but not the bolts.  They are standard AN 8 (1/2") cad-plated bolts with a drilled shank sold many places but you will need to measure the length.   You will need the wide washers shown in the parts manual (a standard washer), castellated nuts and you might need some thick and thin washers and cotter pins.    I saw your post on FB.  What are you going to do with a kind-of Dynafocal engine mount and an engine that uses conical mounts?  I don't see a good way to combine the two.

https://www.aircraftspruce.com/catalog/hapages/an8.php

Don't worry, I'm going to replace the mount for the correct one

[Kent Ashton]

Below, a generic conical mount.  An EZ will be similar but the bolt length varies.

[mquinn6]

I am always amazed at the torque on these bolts! 40 INCH-LBS... and the back out the nut to get to the hole for the cotter pin.    Good detail,  Kent, thank you!

[Kent Ashton]

10 hours ago, mquinn6 said:

I am always amazed at the torque on these bolts! 40 INCH-LBS... and the back out the nut to get to the hole for the cotter pin.    Good detail,  Kent, thank you!

You're amazed because it's so low, right?

[mquinn6]

Normally AN8 1/2-20 is 480 - 500 in. lbs. for tension  or 290 - 410 in. lbs.  I am certain the rubber bushing will smoosh much sooner than the bolt stretches...  but, yeah, 40 in. lbs. always seemed low...  but I am also surprised how many wings are held on by just 2-3 AN6 bolts (in shear) - but that is 76k psi load...  I follow what works (but always question it twice (and verify 3 times)).