This is the place where the majority of the warbird (aircraft that have survived military service) discussions will take place. Specialized forums may be added in the new future
Wed Apr 23, 2008 7:25 pm
I was on C-124's for 7 years and we never pulled a prop through before engine start. We always used the starter.
The only time we were concerned with a liquid lock was when we installed a new engine, we would do a "Burp Run" to make sure all the "pickling fluid" was out of the new engine. This was a procedure in which we would leave the lower cowling off and take one spark plug from each of the cylinders in #4 row. That's the bottom row for those not familar with the 4360 engine.
Then, we would start the engine, using the starter, and let it run at idle for a minute or so, shut it down, install the spark plugs, cowling and we were good to go.
The first time I ever pulled a prop through by hand was when I started helping out on Ol 927.
Wed Apr 23, 2008 7:55 pm
One thing to remember as well is that most of the manuals were written for airplanes that flew on a daily basis. While hydraulic lock can happen even after a few hours, the longer a plane sits, the more likely it is to occur. As such, in many ways, today it is better to pull a prop through by hand to detect possible hydrualic lock because it's more likely to be present in a major fashion unlike with these aircraft when flying in regular service where typically only a minor hydraulic lock would have time to setup and that could be dealt with by the starter without damaging the engine.
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