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Motor mount help??

Posted: Fri May 19, 2017 11:34 am
by oldtrucksrule
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

Re: Motor mount help??

Posted: Fri May 19, 2017 12:04 pm
by Bruce Fenstermacher
Engine mounts, if not entirely, are all the same when it comes to that measurement. In other word they are all interchangeable between models.

Re: Motor mount help??

Posted: Fri May 19, 2017 1:52 pm
by n2582d
36.25" on center between the two top engine mount holes on my 1952 170B firewall.

Re: Motor mount help??

Posted: Fri May 19, 2017 3:19 pm
by oldtrucksrule
Thank you both for the info.

Re: Motor mount help??

Posted: Fri May 19, 2017 3:35 pm
by rupertjl
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.

Re: Motor mount help??

Posted: Fri May 19, 2017 11:50 pm
by nippaero
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.