Engine Mount Torque

[alwaysoar]

The Taylorcraft Service Manual states to torque the engine mount bolts to 60-80 inch pounds. Is this a reference to mount-to-firewall, or the engine-to-mount through the conical rubber vibration dampeners? It doesn't say which. It seems that would be too low for mount to firewall, so what should that be?

[Don Eide]

Re: Engine Mount Torque

My Taylorcraft Service Manual on page 22 states that the nuts on AN6 bolts
are torqued from 65 to 75 inch lbs. on the engine mount to engine bolts.
On page 24 it states 60 to 80 inch lbs for the same bolts.

The AN5 bolts for the engine mount to the fuselage frame going through the firewall are torqued 100 to 140 inch lbs.
Hope this helps.

Don

[Yellow Duck]

Re: Engine Mount Torque

I have the same service manual; but, whenever I put 65-75 lbs of torque, it flattens the rubber mounts too much and cause them to crack and are too ridged. I have put about 50 lbls and that seems to still give me enough and not flatten and crack the lord mounts. I don't know ???? My IA thought the specified torque too much for the rubber mounts I am using. Could it have been that the orginial mounts were able to take more torque ? I also had to use a longer AN 6 bolt the 34 was too short to get a full nut and cotter pin, so I went to the 37, which is now a little too long, but I added washers and got the three to four threads plus the cotter pin, which is in the correct position.

Any thoughts on this ?

[taylorcraftbc65]

Re: Engine Mount Torque

I would think that using the shortest bolt that would still allow at least one washer at each end, and the use of the cotter pin would be just fine.

[Forrest Barber]

Re: Engine Mount Torque

I just squeeze the rubber out a wee bit and stop there. See that al are "even" the check in 20 hours. Then each annual or 100 hours. I put the prop verical and try to move the engine on the mount , you will see quickly if the rubbers are too loose. the book figures are a guide to go by.