What is a good break-in procedure for a newly overhauled engine?
A. The following is a procedure that works well, though it certainly is not the only way to break an engine in. ENGINE BREAK IN PROCEDURE STEEL, CHROME, OR NUCHROME CYLINDERS: 1. Use only straight-weight mineral oil for break in (SAE 40 for winter operations, SAE 50 for spring/fall operations, SAE 60 for summer operations). 2. Pre-oil the engine either with an engine pre-oiler, or by removing the front spark plugs and motoring the engine over with the starter until engine oil pressure is developed. 3. Start the engine and verify that the oil pressure is within the manufacturer’s limits. Test run the engine for five minutes not exceeding 1200 rpm. Avoid long periods of ground running as this promotes cylinder glazing. 4. Shut engine down and check for oil leaks. 5. Taxi for takeoff and do a normal run up procedure 6. Take off, climb to 2500-3000 feet, and level off. 7. Keep the mixture full rich and pull power back to 70-75 percent. Do nothing but shallow turns or straight and level for
