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Steve & Nancy Riffe
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Date:  9-28-2013
Number of Hours:  4.00
Manual Reference:  
Brief Description:  Torqued Grove Gear-left side

I am using the standard hardware supplied by Grove for their airfoiled gear. There is only two major differences between Van’s and the Grove hardware—other than longer bolts. The nuts inside the towers are NAS1804-6 which are higher strength than standard. Also, the washer associated with these nuts is an MS14183L-6. These are heat treated and are a smaller outside diameter that standard. Supposed to fit in the U shaped channel better. Started on the right side—found an issue before I really got started. I can’t get a socket on the outboard forward nut. There is an AN3 bolt thru the gear tower that is about 2 threats too long. So, I’ll remove the bolt and add a washer under the bolt head. Well, to remove that bolt, I have to remove a screw that goes thru the fuse skin and tower weldment. Hmm, can’t get that screw out until I remove the screw above it. Ok, removed two screws and a bolt, added a washer under the head of the bolt, added the two screws back. Now the socket will fit on the nut of the outboard forward bolt. With Nancy’s help we began tightening up the nuts—plans say to alternate applying torque to each nut, moving up 5 in/lbs each time. As you can imagine this procedure takes a bit of time. On the right side I reached the .030 minimum gap at about 160 in/lbs—somewhat short of the required 240 in/lbs. So, moved to the left side. Same procedure (didn’t have the bolt interference to deal with) as the right. Torqued up to 240 in/lbs on both nuts. The clearance on the aft face of the U803 bracket was .030, but the front had a gap of .025. So, I removed the U803 bracket, measured the thickness with a caliper and filed .006” off of the front face, and took .001” of the rear face. Reinstalled the bracket and started the torque process once again. Torqued up both nuts to 240 in/lbs—had a gap of .032 front and back. Next we torqued the inboard 3 nuts. The fore and aft bolts had to be torqued from the head side—this is the reason I added a thin washer when installing these bolts.
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See the bolt heat with new washer, and two screws above it

See the bolt heat with new washer, and two screws above it

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Filing the face of the U803 bracket

Filing the face of the U803 bracket

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Pens point out the 2 bolts that must be torqued from the head side

Pens point out the 2 bolts that must be torqued from the head side

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