One step closer, that's where we are with this engine change.
This week's regular Saturday maintenance day out at the PV-2 ramp was a fairly sparsely-attended event, thanks to the holiday, but that was expected. We still had enough hands to get done what we'd planned: IndyJen (yours truly), Rich, the Official Dad of IndyJen, Steve the Rigger, and our fellow WIXer PJ.
The main event: getting the new shiny engine hung on the mount. We'd planned to have that done a week ago, but inspection revealed a number of un-safetied items and other discrepancies that were a lot easier to address while everything was exposed--the exhaust heat shield ("dishpan") crowds a lot of rear-row stuff, and makes for some tight corners. So we let it go, and worked on tidying up loose ends instead.
As usual, we did this business outdoors. You need plenty of elbow room when it's time to hoist the engine.
Here's what we started with, then (I just don't get tired of looking at the shiny engine):
The big critical thing is to have the hoist all hooked up before disconnecting the prop-shaft clamp. The engine wants to fall over backwards when it's balanced on the cylinders like that.
So, first thing is to carry the engine outside, and bring the engine-mount and its associated stand out there, too. Then we hook up our handy-dandy homemade "H"-shaped hoisting beam. We only use this when picking up the engine alone, sans mount. The arrangment of the suspension eyes keeps the chains clear of pipes, baffles and cylinder heads.
Take up the slack, and then we can undo the prop-shaft clamp and lift her clear. At that point, we can drag the shipping cradle out of there, and push the engine-mount cradle over to the engine. We generally keep the engine stationary, and bring the other things to the engine.
We've done this evolution enough that it's familiar territory, but there's always something that needs to be re-learned. Yesterday's lesson was, "don't torque the Lord mount-to-engine case bracket nut all the way down until the engine's on the mount." Thos Lord mounts need to "float" a little bit, to let them line up with the spools in the mount. It was a frustrating battle for a while there, until the light came on.
Eventually, you get a couple of the Lord mount threaded rods thru the mount sufficiently to start the cone nuts on them. Tightening those couple cone nuts draws the rest of the business in, and aligns them, so all six cone nuts can be installed and tightened. At this stage, just tighten them until they bottom. Do the book torque later. Now it's safe to put in the prop shaft support and remove the hoist.
That engine-mount stand, btw, was designed and fabricated by our man Gaylon, who is top-notch.
And then into the shop with the thing, and off to storage with the shipping cradle. Now we've got room to work in there again. The rest of the day, we're just safetying things that were inaccessible while the engine was on the shipping cradle, and beginning to install accessories and such.
That's Rich, installing the prop governor, and PJ, wedged in underneath, safetying the underneath items.
And aren't we happy to see the engine back on the mount again? Why yes; yes we are.
That's our president, Penny, giving the ol' Pratt $ Whitney muchas smoochas. We would have gone out of business nearly two years ago without Penny; she is a miracle worker when it comes to fundraising and squeezing in-kind donations out of shipping companies and the like. It's important to have people who can turn wrenches, sure, but it takes other skills--like Penny's--to keep these birds in the air, too.
So that's the story of this weekend's mx. Expect to see some rear-case photos next time, as accessories get installed and things get hooked up. Expect, also, to see photographic evidence of more airframe work occurring--we have a cockpit to put back together, especially, and soon we'll likely start pulling access panels on the empennage to check/lube the control cables.
There's always more to do. But there's light at the end of the tunnel, and we will see this bird back in the air soon enough.
Till next time,
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IndyJen
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