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Symptoms of t/c surging and causes

Symptoms:repeated,irregular violent thud from the air intake to the blower, rapid surge in scav air pr, air in take in gulps.
Immediate actions: reduce engine speed, scav trunk relief can be eased. 
Cause: dirty air filters or fouled turbo charger, overloaded or pulsating engine load in bad weather, blocked
scavenge ports and damaged exhaust valves, fuel system abnormalities and misfires, unbalanced output and scavenge fires
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