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    the engine in a aircraft is a time limited component.  the total hours before replacement or overhaul can be up to 2000 hours.  an engine change is generally the most expensive part of maintaining an aircraft.  there are quite a few things that should be done when an engine is changed.

    first the existing engine is removed.  all of the cowling is removed.  the exhaust is removed.  the wiring hoses are disconnected and labeled.  the controls are disconnected and accessories that need to be removed are removed.  generally, the engine is hoisted off the airframe.  the baffles are removed from the engine as well as various components that specific to the airframe.  

    there are two options for the engine: send the existing one out for overhaul and purchase a new or factory remanufactured engine.  for high performance aircraft we suggest the factory option because this type of aircraft flys ifr.  factory remanufactured and new engine have support from the manufacturer since it is their product and workmanship and all components in the engine at new manufacturing specs.  the engines are at zero total time.  generally these engines cost more.  sending an engine out for overhaul is usually taken to a local engine shop for overhaul.  an engine can last 2 overhauls before major components are considered non-airworthy.  an overhauled engine is not zero timed, it keeps its time.  the tso (time since overhaul) is set to zero.  an overhauled engine is a great choice for the recreational flyer.  

    for an engine to be overhauled all engine accessories must be new or overhauled.  we do recommend installing new accessories because the life of the components is longer.  the exhaust should be reworked due to the difficulty to removed the exhaust once the engine is installed.  all of the baffling is repaired.  we highly suggest installing new hoses since they are already mostly removed and labeled.  the propeller and governor are sent out for overhaul.  new engine mounts are installed.

    it takes twice as long for engine to be installed than to be removed. 

 

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