How many hours do you have on the engine? The sort of runaway you describe does happen rarely, but the piston rings have to be worn to near the end of their life (say 8000 to 10000 hours) or you need to almost completely fill the block with oil to the point oil leaks out the dipstick tube.
And never put a rag in the air intake. The suction of the diesel will just suck the rag into the intake manifold and valves (which is really no biggie since you will need to rebuild the head anyway when you rebuild the block after you get it to shut down from a runaway condition). Whatever you do, don't put your hand over the air intake for pretty obvious reasons. It is best to use a flat metal object like a pie plate or a saucepan from the galley to cover the air intake. No airflow + no compression = engine shuts off. Rick Brass From: CnC-List [mailto:cnc-list-boun...@cnc-list.com] On Behalf Of Jean-Francois J Rivard via CnC-List Sent: Tuesday, August 11, 2015 11:50 AM To: cnc-list@cnc-list.com Cc: Jean-Francois J Rivard <jfriv...@us.ibm.com> Subject: Stus-List 3GM30F Oil Pressure warning Hi Rob, I was told by more than 1 mechanic to be very careful about never over-filling the oil in my 3GM30F.. In fact they recommended keeping it between the middle and about 2/3 full level on the stick. The reason for that is to avoid a run-away engine condition.. Apparently the excess oil can get splashed by the piston skirts and somehow make its way into the combustion chamber / burn away without throttle control. I was even advised to keep a rag handy near the engine to stuff it into the air intake and stop it should all else fail.. I am not speaking form experience, but I was told it happens more often than one might think. Best regards, -Francois Rivard 1990 34+ "Take Five" Lake Lanier, GA >> Mike: >>Along the line(s) of what Rick was saying about oil levels, I'll add >>this. My Yanmar 2GMF manual says to put 2 litres of oil in the engine >>after an oil and filter change.....the 2 litres will bring the oil level >>on the dipstick to the full mark only if I use a Yanmar oil filter, >>which is quite small. >>I use a NAPA 1064 Gold Seal oil filter which is larger than the Yanmar >>is and obviously size and 'volume' of oil it can handle. Therefore, I >>need more than 2 litres when I use the NAPA filter to get the dipstick >>to read full How much more exactly?......I haven't measured it >>exactly.....I just add the extra oil beyond the 2 litres until the >>dipstick reads full.....more often than not since I am not exactly >>measuring the extra oil beyond the 2 litres, the dipstick reads slightly >>above the full mark. After reading all these comments about oil levels >>in the marine engines, I don't think I will fret about the oil level a >>little above the full mark. >>Just something else to think about. >>Are you back at the club? >>Rob Abbott >>AZURA >>C&C 32 -84 >>Halifax, N.S.
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