Exhaust Color
Problem / Symptom Cause Action
White Smoke Cold engine Allow engine to warm to operating
temperature
See your authorized Yanmar deal-
er or distributor
Incorrect fuel Replace fuel with correct type
Defective (leaking) fuel injector See your authorized Yanmar deal-
er or distributor
Injection timing is incorrect
White Smoke with Water Vapor Leaking cylinder head gasket See your authorized Yanmar deal-
er or distributor
Leaking charge air cooler
Cracked cylinder head
Cracked cylinder
Blue Smoke Worn piston rings / cylinders See your authorized Yanmar deal-
er or distributor
Oil leak in turbocharger (oil
present in intake manifold)
Damaged piston cooling nozzles
Black Smoke Under Load Clogged intake air filter Replace or clean as necessary
Incorrect valve timing See your authorized Yanmar deal-
er or distributor
Defective (leaking) fuel injector
Low charge air pressure Clean or replace clogged air filter
See your authorized Yanmar deal-
er or distributor
Excessive exhaust back pressure See your authorized Yanmar deal-
er or distributor
Plugged intake port(s) See your authorized Yanmar deal-
er or distributor
Vibration - Drive Disengaged
Problem / Symptom Cause Action
Rough at All Engine Speeds Air in fuel system Bleed fuel system
Faulty fuel injector See your authorized Yanmar deal-
er or distributor
Leaking cylinder head gasket
Damaged intake or exhaust valves
Incorrect injection pressure
TROUBLESHOOTING
BY Series Operation Manual 61
© 2008 Yanmar Marine International
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