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Old 06-07-2004, 05:34 PM   #1
Flyin High
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Hydrolic Lock?

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This past weekend I was breaking in my new O.S AX 46, and I had a case of hydrolic lock. I heard it was bad for your engine, but how? I asume that the instant lock up up of the parts is not so good, but will the engine break instantly if anything does happen, or does it happen over time. Thanx for the input!

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Old 06-07-2004, 06:18 PM   #2
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not sure what your trying to say here ? you hydo (water) locked your plane engine while breaking it in?

I think that would be hard to do. But Hyro locking your engine (happens with boat engines and sometimes car engines) is bad because your engine has inertia when running. when water enters the combustion space, the piston try's to compress it. Water is non compressible. The sudden stop to the engine combined with the inertia of the engine/prop/spinner normally bends the crank or conrod.

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Old 06-07-2004, 06:23 PM   #3
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well it depend how hard it locked, u could bent the con rod,break the crankshaft pin,do a flat spot on the con rod bushing.Does the engine still runs reliably?if so I wouldn't worry about it,You could remove the engine backplate and have a look inside if you like.

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Old 06-07-2004, 07:17 PM   #4
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hydraulic lock

Bobby....how did the engine lock up....did you flood the engine and try to start it using an electric start?
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Old 06-07-2004, 07:29 PM   #5
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Yes, The engine was flooded and I tried to start it.
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Old 06-07-2004, 09:13 PM   #6
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If you were just trying to spin it up and it locked then there is probaly no problem. Like hedgehog posted, the problem comes when there you have a lot of force applied and there is a sudden stop. (or if you force a locked engine to turn ) Something will bend or break.

It is not uncommon to flood the engine while starting it. This is when you end up with too much fuel in the chamber and the engine won't turn over any more. In this case turn the engine on its side, put the piston into the exhaust position and let the fuel drain through the exhaust.

Probably no damage done.
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Old 06-08-2004, 07:44 AM   #7
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What I do to relieve it is take out the plug, put a cloth over the head and spin it a few times. This will also clean out the crankcase. Don't get the rag caught in the prop and then check the plug. Happens quite a bit especially inverted engines. You are probably okay as it happens once in a while with all of us.
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Old 06-08-2004, 08:13 AM   #8
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Hydrolic lock

A good pratice is to turn the motor over with your hand to be sure that the engine is not full of fuel and causing a hydraulic lock because of excess fuel. Make sure that you do not have the glow plug connected to the battery. If there is no resistance to the engine then use your starter. Is the engine an ABC then you will feel allot of compression top dead center till the engine is broken in.
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