Bought a 90 221 liberator. Gas in the oil?

[L. Dubya]

Need some advice. Bought this beautiful boat at the end of this season. Took it out once and hit about 58mph with 7 people. Has 7.4 454, Silent exhaust, Custom headers, roller rockers and eldibrock carburetor. That’s all I know. At the end of that day of it running great it started missing. Stalling at idle. I changed the plugs and wires adjusted carb and found the smell of fuel in the oil.. any suggestion? Suppose to be a new crate motor with 50 hours on it. Was so excited that I didn’t do anything and put it in water. Ran it hard. Boat may have been stored for four years.

 

[Scott Danforth]

welcome aboard

first, check the clear tube from the fuel pump to the carb.

if its full of fuel, your fuel pump needs replacing.

 

[L. Dubya]

Will look at that tomorrow after work. If I remember right the tube isn’t so clear anymore.

 

[L. Dubya]

The oil was milky and reeked of gas. I checked compression on only the port side it all read 125psi

 

[Scott Danforth]

A second source of fuel in gas is leaking welsh plugs in the carb

Either way, youre going to need to change oil and find the issue before going out again

 

[harringtondav]

Is your oil level high on the dipstick? If so, you have a lot of gas getting into your oil sump. Thin oil may have lowered your compression measurement, which seems low for a 50 hr. engine. I'd start with Scott Danforth 's advice. The excess gas is coming through the carb. Either from the bad fuel pump, or a too high carb float, or blocked open float needle valve.

 

[alldodge]

The oil was milky and reeked of gas. I checked compression on only the port side it all read 125psi

Milky means you have a water leak into the block, so head gasket, intake or block.
Gas in the oil can be the fuel pump tube but this being a 1990 then the pump is mounted on the block, so it could also so the fuel pump could be leaking fuel from the pump into it

 

[L. Dubya]

Today I went to check on the clear tube. No fuel in the clear tube. I also checked the dipstick today and it didn’t smell like gas. It was reading high. Still milky. Finished compression test all cylinders reading 125 psi. So I’m thinking it is water in the oil. Could it be the exhaust gasket? I started it for a min and saw smoke coming from exhaust manifold gasket. I appreciate all the feed back everyone is giving.

 

[alldodge]

all cylinders reading 125 psi

Pretty odd for every cylinder to be the exact same, and 125 isn't great

Could it be the exhaust gasket?

No not at that location

 

[L. Dubya]

With in a pound or two. Was not digital gauge. End of season and only have a couple more weeks to figure out until storage time.

 

[NHGuy]

Milky oil, had a fuel smell.
Can be water in oil or fuel in oil or both.

When you removed the plugs how did they look? Look down the insulators that are below the electrodes. You want tan, not black. If they are black or dark colored it indicates rich or over fueling. Edelbrocks are easy to work on. Their book is in the Edelbrock website. If it's fuel, check for stuck or mis adjusted floats. If those are OK check for high fuel pressure.
If there are questions on how to repair the carb please ask, a lot of us have had them open.

If the plugs are good, and even if they are not, you can check for water in the oil by blocking off the cooling water exits with clamps. Then pressurize the cooling system through the intake hose. If it holds 12 or 15 psi, good. If not listen around exhaust, intake, and oil fill to determine where the air comes from.

 

[Rick Stephens]

if there are questions on how to repair the carb please ask, a lot of us have had them open.
.

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