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Old 20-05-2022, 16:14   #16
Marine Service Provider

Join Date: Sep 2014
Location: Auckland, NZ
Boat: Compass 790 , 7.9 metres or 26 ft
Posts: 2,739
Re: Yanmar 3QM30H (fresh water) white smoke.

Good job talking OP thru it Wottie,
Nice job cleaning it up Rmccormi, lucky you got to it before you blew the head gasket. I get a few raw water cooled Yanmar ( salt water berths) owners coming to me for head gaskets from blocked cooling galleries as they havent been flushed. If you are in Sacramento I guess u r mostly in fresh water tho which helps. Rusted out exhaust elbows also kill a lot of the YS series yanmars that i deal with too. I built my own ss mixing elbow as didnt like the Yanmar design or price.
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Old 21-05-2022, 16:18   #17
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Join Date: Jan 2008
Location: South of 43 S, Australia
Boat: C.L.O.D.
Posts: 18,313
Re: Yanmar 3QM30H (fresh water) white smoke.

Originally Posted by Rmccormi View Post
Finally got down to the boat, flushed the engine, installed the manifold, new water hoses, and exhaust hose. Started the engine and it seams to be very happy! Again thanks for your support ...................
Glad it worked out OK. IMHO, the QM series are great engines even if a bit heavy.
All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find it was vanity: but the dreamers of the day are dangereous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence
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