Gasoline in the oil pan

frank924

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Apr 12, 2009
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I have been having a terrible time getting my '88 Malibu running. I have been unsuccessful in fixing a no spark issue at the distributor, so had a mechanic swap in a new coil and Mallory distributor. He mentioned that at one point he notice the carb was just DUMPING fuel into the engine while he was trying to get it started. WHen I got the boat back, it smelled of gasoline and had puddles of oil in and around the intake manifold, and coating lightly the entire engine. I changed the oil with my vacuum pump and removed 17 liters of oil and gasoline! So, my question is what do I need to do? I am concerned about what may have happened if the engine was run with that in the crank case.. It must have run some or it wouldn't be covered with that light misting of oil, which I figure was blowing out all over since the crank case was over full and the oil was so diluted.

I have not been able to get the engine to start, so it has not run for me. Advice on the oil problem is appreciated, and then I may ask some questions about diagnosing my starting problems. I do not think I want to return to the mechanic.
 

superpop

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Re: Gasoline in the oil pan

You are lucky nothing went boom. If you have the ability and experience, I would rebuild the carb, sounds like the floats are messed up as this typically is what causes this. Also check your fuel pump. If you have the motor mounted fuel pump I think it dumps gas into the motor when it goes bad. If the pump checks out then go buy a new carb or have yours rebuilt. And change the oil. The mechanic really should have warned you about this.
 

Bondo

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Re: Gasoline in the oil pan

Advice on the oil problem is appreciated,

Ayuh,.... Put a new Carb on it,+ the oil problem will go away....
 

frank924

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Re: Gasoline in the oil pan

This journey began with the boat running poorly, and I started by replacing the fuel pump, then the carb with a rebuilt one. neither item has more than an hour run time because while it "ran", it became harder and harder to start then finally nothing, which lead to wholesale parts swapping, partly because of the age of the engine, and partly trying to fix it. SO, it has a new starter, alternator, distributor, coil (started with an MSD Blaster that I noticed yesterday was leaking oil and the top was loose, so I have returned to the OEM that was on it), fuel pump, carb, battery.

I think my mechanic is in over his head, but he told me the boat was running good and easy to start when he called me to come get it. I am thinking I should cut my losses and go elsewhere. I am concerned that it ran for a while with little lubrication and what damage may have been done to it.
 

CharlieB

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Re: Gasoline in the oil pan

Before you even THINK of starting your motor you have GOT TO repair that flooding carb!!!!!!

Fuel in the crankcase can create an extremely explosive possibility, definitely one that MUST BE rectified immediately.

Ventilate the engine compartment until ALL traces of fuel fumes are removed to lessen any possibility of a flash or fire.

Once your carb is repaired THEN you can get back to your ignition problems.

Once you have the engine running, change the oil AGAIN to further remove traces of fuel that did not come out with the first oil change.
 

Bondo

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Re: Gasoline in the oil pan

I think my mechanic is in over his head,

Ayuh,... I think You're in over your head,+ You Don't have a Mechanic,... Not a very Good 1 anyways...

You're not a Mechanic,...
That makes it alittle tough to Help you out....
Other than you have an Unsafe fuel system issue that needs Fixin'....
I'm sure the runability issues will fall into line when the Fuel issue is addressed....
 

frank924

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Re: Gasoline in the oil pan

Bondo, Frustrated ranting may occur.

Yes, actually, I am a fair mechanic. I successfully maintain my own cars, which are all electronic ignition and fuel injected, have done engine swaps and restored my two hobby cars, a Porsche 911, a Datsun 280Z, which both start and run every time. My lawnmowers sit all winter yet start every spring. My boat, which gets far more attention and care than all my other conveyances combined is, by comparison, an unreliable expensive piece of crap. When it ran its best it didn't run GREAT. It appears to me that boat people will put up with more unreliability that we should have to. Modern internal combustion engines start and run.

This story began when I just got really gotten stumped with multiple problems on a carbureted engine in a boat hanging on my boat lift at a remote lake.

Several knowledgeable people attempted to help me solve the rough running problems which appeared to be fuel related hense the wholesale changes- made one at a time - such as the carb last year and fuel pump. The boat ran but seemed like it was starving for fuel - never gave full throttle, bogged down, etc.

Then it became hard to start, so I began a quest to upgrade everything to electronic ignition to remove that as a possibility and to get away from points, and when I swapped the distributor, I was never able to get fire again. That distributor turned out to be bad, per the mechanic. Remember it was hanging on my lift, 40 miles from the nearest parts store or help. So, I ran out of time to figure it out, and decided with much embarrassment to take it to a reputable boat shop and once there it has developed worse problems such as the gas dumping.

The gas dumping problem started after the boat sat through the winter at the mech shop. The mechanic who has been in business for 30+ years is either a serial liar because he has called me to come get it twice claiming it was running perfectly and was easy to start, and twice it has not even remotely done so, or something happens between his shop and my house, which is not likely.

So please do not assume that I won't understand any advice you may have. I agree, I have to fix one problem at a time. However, I do not know much about carburetors. For example, if the boat won't run, how do I fix and test the carburetor? Once that is fixed, how do I determine whether my new Mallory distributor is DOA since I still do not have fire? The mechanic installed it without a ballast resistor. I asked him if it needed one and he said it did not, which was false, so it may have been damaged by his installation, So, now I have to either eat the cost of a new module or make him pay for it as a parting gift. I have never had so much trouble with a mechanical device in my life, and I bought this particular boat in part because it would be simple to keep running, or so I thought.

I just want to do what it takes to once and for all make the boat run as it should and start reliably. Each step has seemingly taken me farther from that goal.
 

superpop

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Re: Gasoline in the oil pan

As my High School Auto Shop Instructor said 25 years ago, keep it simple. You need three things to make a motor run, Fuel, Spark and Compression. So before you do anything start with those three. I would start with Compression first. Remove the plugs and check compression. If that looks good, move on to Spark. Take a plug out and check for proper spark. If you do not know how to do this safely then get out the manual. You should also check your distributor while you are doing this to make sure the firing order is correct. Once you know if you have Compression and spark, you now need to work on fuel and to a lesser degree timing. Take the carb off and take it to a reputable carb shop, tell them you want the floats set since it sounds like whoever did the carb did not do this. Once you get the carb back put it on and hook the carb up and see if it fires, if it does not then you have another fuel problem somewhere else, maybe the tank or hose. Once it is running then you can check timing ect and give the carb some final mix adjustments on the motor. Before you do any of this though I would change the oil. Sorry if this sounds simplistic but I have found that if you start with the simplest of steps, you catch little things that could be tripping you up.
 

frank924

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Re: Gasoline in the oil pan

As my High School Auto Shop Instructor said 25 years ago, keep it simple. You need three things to make a motor run, Fuel, Spark and Compression. So before you do anything start with those three. I would start with Compression first. "

Thanks for the sound advice. I hope to post a follow up as soon as I have results.
 

frank924

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Re: Gasoline in the oil pan

Bubba1235 A final thought. A mechanic that would run a marine engine spraying oil/fuel every where should be walked out on and never seen again.[/QUOTE said:
My thoughts exactly, except to get warranty on the dist I have to confront him on this stuff. Thanks for your detailed post.
 

CharlieB

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5,617
Re: Gasoline in the oil pan

Another important point

High performance automotive parts, carbs, fuel pumps, distributors, starters, alternators, are NOT TO BE USED in a marine application.

Marine parts are CERTIFIED , spark arrested, external fuel leak free.

The correct Marine parts are usually more expensive, but when you consider the possibility of a fire while out on the water.

Well, as I ask my customers, "Can you WALK on water?"
 

liquidlew

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Feb 14, 2008
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Re: Gasoline in the oil pan

I was going to mention compression also, these problems sound similar to ones I had a year ago. It was very hard to start or it wouldn't start at all, thought it was the carb, so I had that rebuilt, new coil installed and the problem persisted. Finally got around to checking compression and found I had low comp in one cyl due to bent valves. Did a valve job, tune up, and made sure the timing was correct per MERC factory manual, and BINGO! I get one click starts every time when I'm out on the water now! Check the compression, timing, and either get the MERC manual for your engine or you can check it out here,click on the Adults Only at the top of the posts column put up by Don S. Good luck!
 

liquidlew

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Re: Gasoline in the oil pan

Hmmm... You're right, it has nothing to do with no spark, got me on that.:redface: But he can still check compression without spark, motor still turns over don't it? My probs sounded similar but I did have spark. With low comp in one cyl, mine kept turning over without starting and soon it was flooded, plus I later found out previous owner had wrong/automotive coil on it, so he should check to see if he has the right marine coil too. Sorry, just trying to help a little.
 
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