Motor mount help??

How to keep the Cessna 170 flying and airworthy.

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Motor mount help??

Postby oldtrucksrule » Fri May 19, 2017 11:34 am

Hello All,

I have a rag wing 170. I'm currently having the engine (c-145/o-330) rebuilt. I also decided now would be a good time to have the engine mount gone through at Aerospace Welding in Minneapolis. Anyway, they called today and asked if I could measure the distance from center to center of the upper engine mount holes on the airframe? The technician went to secure the mount to my box I fabricated for the shipment and it was over an inch off. So, he asked if I could measure the holes to see where the error lay. Problem is, I live in the DFW area and my airplane is currently in a hangar 6 hours away. Does anyone have any experience with differences between various models of C170 models in regard to the engines and mounts?

Thanks, Cory
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Re: Motor mount help??

Postby Bruce Fenstermacher » Fri May 19, 2017 12:04 pm

Engine mounts, if not entirely, are all the same when it comes to that measurement. In other word they are all interchangeable between models.
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N7A '49 170A -More original than most making folks GREEN with envy
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Re: Motor mount help??

Postby n2582d » Fri May 19, 2017 1:52 pm

36.25" on center between the two top engine mount holes on my 1952 170B firewall.
Gary
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Re: Motor mount help??

Postby oldtrucksrule » Fri May 19, 2017 3:19 pm

Thank you both for the info.
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Re: Motor mount help??

Postby rupertjl » Fri May 19, 2017 3:35 pm

I have the original cessna prints for the engine mount, the top mount dimension shows 18 5/32" from the centerline of the drawing and 13 13/16" for the bottom mounts from centerline.
1950 170A: N9191A s/n 19366
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Re: Motor mount help??

Postby nippaero » Fri May 19, 2017 11:50 pm

I measured mine on the floor and it is showing 36 5/8". Perhaps it sprung apart when we removed it. I can measure my holes tomorrow when I'm at the hanger.
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2017-05-19 17.42.20.jpg
2017-05-19 17.42.14.jpg
1952 170B
N8180A s/n 25032
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