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Paul,
Don't ask how I know about tightening the nut to the bolt shoulder -
'cept that the engine rattles around a bit.
BTW, It is a good idea to check the torque of the engine mount to
firewall bolts each year - you might be surprised.....
Scott
In a message dated 1/23/2012 11:42:13 A.M. Central Standard Time,
paul@tbm700.com writes:
Scott:
thanks, that makes sense because I believe I want to see some threads out the
top of the mount to confirm full engagement.
On a related topic, is there any reason not to use AN7H drilled bolts (in
the head) in order to lockwire the engine mounts versus adding the unique lock
tab washers that are more difficult to obtain? I can't see any reason
not to use the drilled bolts beyond the $4 cost from Spruce. On other
aircraft, I note we use a lock tab washer that fits into the hole on the
isolator and those are an MS standard. But Lancair specs an additional
washer between the isolator and bolt head hence the hybrid lock tab washer
requirement. An AN7H bolt would seem to be a simple answer to
avoid the lock tab washer. I'm betting someone has already been down
this road?
Paul
Paul,
AN7 bolts in tension should be torqued to 450-500 inch lbs. Make
sure no more that three threads show - otherwise there is danger that the
nut has been torqued to the shoulder of the bolt rather than holding the
bolt in proper tension.
Scott Krueger
In a message dated 1/23/2012 6:50:46 A.M. Central Standard Time, paul@tbm700.com writes: Reinstalling isolators on the io550 and cannot see any specs
for the AN7 bolts for torque or threads. Do they get torqued or just
threaded through top of the engine mount? Thx
Paul
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