I cut the lawn today(about 1 hour) and then did a complete oil and filter change after letting oil drain out for 30 minutes. Upon start up the engine has rattling noises in the OHV area. Shut off the motor and checked oil level, its Ok. Started engine and let run for 10 seconds still rattling. Several more times for 20 seconds, loosened oil filter while running and oil leaks out. Are the valves air locked?
