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Message-ID: <42133AE5.9030906@earthlink.net>
Date: Wed, 16 Feb 2005 06:21:57 -0600
From: David Staten <Dastaten@earthlink.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Some progress on the engine mount..
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Well, went out this morning to the hangar and commenced to some minor 
aircraft work.. nothing spectacular...
 
My first minor project was drilling bolt heads for safety wire.. I 
tapped 2 of the M6x1x25 hardware store bolts (that I had bought for the 
pan mounting ) for safety wiring. I then took the pickup tube and spacer 
and used Permatex to mate them together, then permatex'd and bolted the 
tube and spacer assembly to the block. My next experiment was my first 
at safety wiring "properly". I ended up making about 2-3 tries at it 
before I was satisfied that the wire arrangement would not allow the 
bolts to loosen.. minimal bloodshed and looks pretty good.
 
I spent some time dressing the oil pan for preliminary mounting, 
including cleaning out shavings from some minor surgery I did on it last 
week. The stock pan has a baffle in one corner that deflects spray from 
the rear pressure regulator. However, these baffles interfere with 
mounting flush against the CCI mounting plate, so we dremeled them off 
and deburred it during my last hangar session. After removing old gasket 
material and wire brushing the pan, I turned to the engine. I ran 4 
small  M6x1x25 hardware bolts into the block through the mount maybe a 
turn or two.. just enough to hold, then I picked up the block using the 
engine hoist. This gave me a uniform gap of about 1/4" to work in around 
the perimeter of the mounting plate. I brushed on permatex to the top of 
the plate and the bottom of the engine and set up a liberal coat as best 
I could. I then cinched the bolts down slowing, drawing the engine back 
down to the mount and allowing some time for the permatex to start to 
set up before it was compressed between the two surfaces. I let this sit 
for a bit, and of course let all the tension off the hoist. I then took 
after the pan and brushed the permatex on the pan flange and bottom of 
the mounting plate. Painting uphill with runny sealant was a challenge 
and my fingers STILL have a protective gasket coating on them.. But I 
was able to mate those surfaces and ran in about 14 of the hardware 
store bolts, to cinch the pan snug.
 
It was at this point I realized that mounting the pan/engine would be a 
little tricky. The rear/aft portion of the CCI mount has a crosspiece 
underneath the pan that runs along the bottom side of the pan 
flange/bolt line. This interferes to the point that two holes are unable 
to have a socket placed on bolts located in them, and 4 or 5 more holes 
are inaccessible with proper length bolts. The most obvious solution is 
to remove the corner shock mount bolts to allow lifting the mounting 
plate off the remainder of the frame. I dont have the documentation 
handy from the CCI mount. If Fred or anyone else here with the info is 
able to, let me know the procedure to remove and reinstall the shock 
mount bolts to allow access to the rear line of pan mounting bolts. With 
Chris's current schedule its difficult for us to catch up with each 
other lately, so if someone from here gets back to me before he does 
regarding this, all the better.
 
On a side note, yes, I am using hardware store bolts at the moment.. 
they are temporary only. I will be going to the bolt shop today or 
tomorrow and getting some grade 8 metric bolts. I would like to poll the 
audience however, regarding methods of safetying the bolts. Any 
experience with safety wire on this number of bolts? Lock washers? Star 
Washers? Locktite? Looking back I wish I had safetywired the Tension 
Bolts on the engine rebuilt, simply in case one sheared it wouldnt risk 
hitting anything by sliding out, but thats not a realistic option 
without rebuilding the engine at this point (we had a real snug fit with 
all the silicone and shrinkwrap on the bolts)
 
On a side note, Chris put the AN fittings on the aluminum tubing that 
runs from the oil cooler in the nose to the aft bulkhead. Pictures to 
follow.
 
Dave