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6080 John deere loosing RPM

zimnucks

Contributing Member
Ive got a boat with a single 6080 engine , the problem im facing is its loosing Rpm after about 30 mins of running . Ive changed the turbo , injector pump and injectors . Ive put a new racor on , ran an electric fuel pump before the lift pump and still no change . Ive checked the fuel lines , cleaned the intake manifold , fitted a new exhaust elbow , checked the exhaust for restriction . Most of this work has been done as there has been no maintenance on the motor for the last couple of years . Any ideas of what to look for , the Dealer has given up trying to help me ?
 
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