Originally Posted by stepheniser
Yoday I look at a2006 MS 40 with a Yanmar 6GLYA-STP. Total hours were 1518 and service june 2012 at 1516 hours. In the past 6 months engine was ran only 2 hours. Upon starting, the engine smoke likely and produce a light oil sheen on the water, we ran the engine for approx i5 minutes,engine temp reach approx 125. In The broker said that it was do to lack of use and if the engine is ran for say a 1/2 hour under load it will clear up, or is their some other serious problem. Please I need feedback
I think there is something wrong with the ID letters on this engine. I have been to three Yanmar sites including Boat Diesel and I can't find any such engine. The only G series Yanmars are the 1, 2 & 3 cyl GM Raw and Fresh water engines. The engine is most probably a 6LYA-STP 370 HP.
That said I agree with Don. The engine never got warm and won't get there ideling at the dock. True the water temp might get up but the internal temps will not. Tie off a good spring line and secure all of the dock lines, start her up and put her into gear. Load he up a bit and then let her run for 10 minutes.
My guess is she is just fine.