Due to living overseas I haven?t touched my project since early 2014, and I am only getting to spend a few weeks a year working on it but it's better than nothing!
My engine was dropped off a few months ago (Thanks Wayne!) so I set about tearing it down to see what surprises it had in store for me. It was a very cheap IO-360-A1B6 with 700hrs TT and no damage history but it had been sitting unpreserved for 20 years. Nothing quite like taking a gamble
The floor of a barn isn't the best environment for engine work, but no worries - a few hours later and I had it reduced to a pile of parts.
Things I noted:
Some rust on rocker shafts and piston pins.
All cylinders have a little patch of light corrosion in the bore. Cylinder 3 is pretty badly pitted but hopefully it can be salvaged.
Crankshaft and camshaft both look to be ok, with no corrosion or wear visible on the cam lobes. All of the followers/tappets etc look good.
Cylinder 3 piston has a bit of scuffing around the crown and the skirt, which might be related to the heavier corrosion in that cylinder. The other pistons look good.
Accessory gears all look good, no rust or pitting. Fuel pump cam and plunger look good.
The crank has the lightening holes in the prop flange, and the hollow section was full of sludge. It looked OK once I it cleaned out, I?ll do some further checks on the crank later.
I cleaned the cylinders, and treated the bores with some sticky spray grease, and have stored them in an airtight container with some desiccant.
The crankcase was wrapped in plastic after fogging it with some sticky preserving oil.
All other parts were treated with preserving oil and sealed in plastic.
My plan is to send the cylinders to be checked, and then do a few basic checks on the crank and cam without splitting the cases. If the cylinders can be saved, I?ll reassemble the engine with new gaskets/rings/accessories etc and comply with all relevant AD?s. This is my preferred option in the interests of saving money! If the cylinders are toast, then I?ll split the cases and get a full overhaul done with new cylinders, or use it to make a coffee table..
Tomorrow I'll continue building my third horizontal stabilizer (I wasn't happy with the first two for various reasons) and I will be incorporating the front spar SB at the same time. Then I can mount it to the fuselage and continue with the control systems later on in the week.
Happy new year!