350 Merc - gas in my oil Any Ideas?
 

Gas in my oil. Boat runs perfect. First, thinking it can't be the float
since boat runs great. Changed the fuel pump thinking must be problem.
Still gas in oil. A friend ran into a mechanic who suggested it had to be
the Thermostat. Said the boat is not getting up to operating temp, the gas
is not being burned in cold engine. Sure enough, my thermostat was not
working. Tried to install thermostat, however could not figure out how to
remove stat out of housing. I have a Merc design #1 SB housing. Could not
get stat out of housing, so I punched out middle so water could pass
unobstucted and installed the thermostat in the top of the engine where it
normally goes. Now boat is running at proper temp, however I am still
getting gas in the oil. Now I am wondering if the position of the
thermostat may be important enough to make a difference? Any Ideas or
suggestions? I am running in the straits of Mackinaw, from early spring
until ice forms.

Thanks, Mr Ranger

350 Merc - gas in my oil Any Ideas?
 

You still might have a bad float. It could be leaking down when you are stopped
but not leaking bad enough to make it run bad.

350 Merc - gas in my oil Any Ideas?
 

Engine running cold will not cause gas to get in the oil. Not sure how you
determined you have gas in the oil but when it happens it is usually stuck
carb float. Or a cylinder not firing at all.

"Mr Ranger" wrote in message
...
Gas in my oil. Boat runs perfect. First, thinking it can't be the float
since boat runs great. Changed the fuel pump thinking must be problem.
Still gas in oil. A friend ran into a mechanic who suggested it had to be
the Thermostat. Said the boat is not getting up to operating temp, the
gas
is not being burned in cold engine. Sure enough, my thermostat was not
working. Tried to install thermostat, however could not figure out how to
remove stat out of housing. I have a Merc design #1 SB housing. Could
not
get stat out of housing, so I punched out middle so water could pass
unobstucted and installed the thermostat in the top of the engine where it
normally goes. Now boat is running at proper temp, however I am still
getting gas in the oil. Now I am wondering if the position of the
thermostat may be important enough to make a difference? Any Ideas or
suggestions? I am running in the straits of Mackinaw, from early spring
until ice forms.

Thanks, Mr Ranger

350 Merc - gas in my oil Any Ideas?
 

I get my thermostat out (on the same engine) by removing the whole
housing (I have to disconnect all the hoses) and tapping it out from the
"down" side. There's a brass sleeve that sits on top of the thermostat
that should just slide out (it just slides in) but never does of
course. You could probably just grab the old thermostat with vise-grips
or channel locks and yank hard but I don't mind taking the whole
kit-and-kaboodle off once in a while. You also need another gasket (the
one between the housing and the block).

I don't know nuthin about no gas in oil - sounds bad.

mike

350 Merc - gas in my oil Any Ideas?
 

Mike, For whatever reason, its like the stat is molded into the housing.
It would not drive out in either direction. I finally drove the center of
stat out with a chisel and hammer. The flange is still in place in the
housing. Two other guys helped me and none of us could see any other way.

As far as the gas in oil, I am taking the suggestion of Greg and have
ordered a new float.

Thanks Mr Ranger

350 Merc - gas in my oil Any Ideas?
 

Could be a bad fuel pump....

Bill

350 Merc - gas in my oil Any Ideas?
 

Bill, The first thing I did was change the fuel pump. I have the carb
parts on order and will try that next. Hopefully I don't have to go back
to the fuel pump again.

Thanks, Mr Ranger

Could be a bad fuel pump....

Bill