Why is Engine Oil is Runny and Smells Like Gasoline?

[milkyway]

What is the cause of this and how can it be fixed?

 

[Gary H NC]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

Manual or electric fuel pump??

 

[Scaaty]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

And carb type, engine, year.........

 

[milkyway]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

Sorry. It's Merc 5.0L, 1999, Thunderbolt V.<br /><br />The viscosity of the oil looks like has been totally wiped out and really smells like fuel.

 

[tommays]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

With all the running problems you have had this spring i would start with fresh oil and see what happens before calling it a problem<br /><br /><br />All the long idle times with a badly running motor NO starts with long cranks ect would dump a lot of fuel that would normaly not get there at all and some fuel would be cooked out of the oil with long run times at normal temps <br /><br /><br />tommays

 

[milkyway]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

Tommays- you know my previous issues but this is not about it. Actually, despite the fact that I emptied the tank and put fresh fuel, new fuel filter, verified that the pick up house filter is not clogged, and new water/fuel separator, eletric pump is running, the engine ran only for 5-7 seconds last night. Happened 6 times and I gave up, disappointed. Before these changes, it ran for 30 minutes. That's another chapter. I mught end just just barbecuing this Father's Day.<br /><br />Now going back to this thread, I changed the oil last night and this old oil is from previous season. You are saying that long idling, long and many cranks would cause extra fuel to be burned with the engine oil? Could too rich mixture also cause this?

 

[hullofalottatrouble]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

milkyway.. is this all the first time you tried to run the boat after the winter? you saying you didnt change the oil before winter or as part of your summerizing?<br /><br />have you pulled the plugs and turned the engine over to see if anything... gas.. water.. etc.. shoots outta the cylinders? have you done a comp test? <br /><br />is the oil so full of gas that is over full? do you have the fuel pump with the site glass? or the clear hose running in to the carb.. is their gas in either? if so need to replace pump..

 

[tommays]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

I am saying that long idling and long cranks would put a LOT OF UNBURNED FUEL in the oil <br /><br />When a motor is running GOOD there will be some amount of fuel dilution in the oil <br /><br />When its running BAD there will be more fuel dilution in the oil<br /><br />tommays

 

[milkyway]

Re: Why is Engine Oil is Runny and Smells Like Gasoline?

Tommays - Got it. I want to bring the boat to my exxon mechanic tomorrow for timing so I can go out Sunday but I want it to start and at least warm up for timing, if they can establish the missing TDC.