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M/e troubles. High exhaust temperatures & low exhaust temperature

High exhaust temperatures (all units):
High scavenge air temp, fouling of air or gas passages, t/c, wrong camshaft position, wear of fuel or
exhaust cams,bad fuel, scavenge fire and overloading 
High exhaust temperature (single unit)
Faulty fuel pump or valve.leaky exhaust valve, scavenge fire in particular unit,cooling failure in particular unit. Low exhaust temperature(one unit):faulty fuel injector, fuel pump, fuel pump plunger sticking
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