Exhaust Color; Vibration - Drive Disengaged - Yanmar 4BY2 Operation Manuals

Exhaust Color

Problem / Symptom
White Smoke
White Smoke with Water Vapor
Blue Smoke
Black Smoke Under Load

Vibration - Drive Disengaged

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