It would really help if you gave more information regarding which Yanmar engine you have specifically. Certain engine models often have known issues. Also, would HIGHLY RECOMMEND you read the POST in my signature.
BTW, here's quick and dirty summary to identifying some troubles with diesels:
BLACK SMOKE - Restricted air flow ( dirty / obstructed air filter; plugged exhaust; restrictions in exhaust system; defective turbo / supercharger); Overload; Improper injection (poor atomization, injector dribble, late injection)
BLUE SMOKE - Worn or stuck piston rings; worn valve guides and stems; high crankcase pressure; worn / supercharger oil seals.
WHITE SMOKE - Misfiring cylinders; water in fuel; air in fuel; water in cylinders (blown head gasket, cracked head or liner); lack of compression.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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