Propeller Removal and Installation Removal  Servicing Propellers Cleaning Propeller Blades Installation The following procedure is for demonstration purposes only.  Always use the current manufacturer’s information when  removing and installing any propeller. CAUTION: remove the propeller from the mounting  flange with care to prevent damaging the propeller  mounting studs. Using the support sling, remove the  propeller from the mounting flange. A flange propeller has six studs configured in a four-inch  circle. Two special studs that also function as dowel pins  are provided to transfer torque and index the propeller with  respect to the engine crankshaft. The dowel pin locations  used on a particular propeller installation are indicated in the  propeller model stamped on the hub. Perform the applicable  steps under Spinner Pre-Installation and clean the engine  flange and propeller flange with quick dry stoddard solvent  or methyl ethyl ketone (MEK). Install the O-ring in the O-ring  groove in the hub bore. NOTE: When the propeller is received  from the factory, the O-ring has usually been installed. With  a suitable support, such as a crane hoist or similar equipment,  carefully move the propeller assembly to the aircraft engine  mounting flange in preparation for installation. Install the propeller on the engine flange. Make certain  to align the dowel studs in the propeller flange with the  corresponding holes in the engine mounting flange. The  propeller may be installed on the engine flange in a given  position, or 180° from that position. Check the engine and  airframe manuals to determine if either manual specifies a  propeller mounting position. To remove grease or oil from propeller surfaces, apply  Stoddard Solvent or equivalent to a clean cloth and wipe  the part clean. Using a noncorrosive soap solution, wash  the propeller. Thoroughly rinse with water. Permit to dry.  Aluminum and steel propeller blades and hubs usually are  cleaned by washing the blades with a suitable cleaning  solvent, using a brush or cloth. Do not use acid or caustic  materials. Avoid power buffers, steel wool, steel brushes,  or any other tool or substance that may scratch or mar the  blade. If a high polish is desired, a number of good grades of  commercial metal polish are available. After completing the  polishing operation, immediately remove all traces of polish.  When the blades are clean, coat them with a clean film of  engine oil or suitable equivalent. To clean wooden propellers, use warm water and a mild  soap, together with brushes or cloth. If a propeller has been  subjected to salt water, flush it with fresh water until all traces  of salt have been removed. This should be accomplished  as soon as possible after the salt water has splashed on  the propeller, regardless of whether the propeller parts are  aluminum alloy, steel, or wood. After flushing, thoroughly  dry all parts, and coat metal parts with clean engine oil or a  suitable equivalent. Aluminum and steel propeller blades and hubs are usually  cleaned by washing the blades with a suitable cleaning  solvent, using a brush or cloth. Do not use acid or caustic  materials. Power buffers, steel wool, steel brushes, or any  other tool or substance that may scratch or mar the blade  should be avoided. If a high polish is desired, a number of  good grades of commercial metal polish are available. After  completing the polishing operation, immediately remove all  traces of polish. When the blades are clean, coat them with a  clean film of engine oil or suitable equivalent. Propeller servicing includes cleaning, lubricating, and  replenishing operating lubrication supplies. Install the propeller mounting nuts (dry) with spacers. Torque  the propeller mounting nuts (dry) in accordance with the  proper specifications and safety wire the studs in pairs (if  required by the aircraft maintenance manual) at the rear of  the propeller mounting flange. CAUTION: Tighten nuts evenly to avoid hub damage. CAUTION: Mounting hardware must be clean and dry to  prevent excessive preload of the mounting flange. 1.  Remove the spinner dome in accordance with the  spinner removal procedures. Cut and remove the safety  wire (if installed) on the propeller mounting studs. 2.  Support the propeller assembly with a sling. If the  propeller IS reinstalled and has been dynamically  balanced, make an identifying mark (with a felt-tipped  pen only) on the propeller hub and a matching mark on  the engine flange to make sure of proper orientation  during reinstallation to prevent dynamic imbalance. 3.  Unscrew the four mounting bolts from the engine  bushings. Unscrew the two mounting nuts and the  attached studs from the engine bushings. If the  propeller is removed between overhaul intervals,  mounting studs, nuts, and washers may be reused if  they are not damaged or corroded. 4.  Place the propeller on a cart for transport. 7-27