Oil leak

[gerritm]

I am beginning to think it may be an over pressure problem. We have found oil puddling on top of the fuel filter in the little recesses. It still is only happening at max rpm (5K plus). Can it be blowing out of the dipstick? What are the causes. I know there is a pcv valve somewhere down below the intake. Could that be plugged? I covered the dipstick and tied a rag around it to see if this is the source. Next good run may tell.

 

[DAREDEVIL]

I am beginning to think it may be an over pressure problem. We have found oil puddling on top of the fuel filter in the little recesses. It still is only happening at max rpm (5K plus). Can it be blowing out of the dipstick? What are the causes. I know there is a pcv valve somewhere down below the intake. Could that be plugged? I covered the dipstick and tied a rag around it to see if this is the source. Next good run may tell.

Usually its the dipstick.

 

[gerritm]

Usually its the dipstick.

What do you think would cause this?

 

[PARADOX]

Gerr.

Not a motor head here, but try one more thing. It may be as simple as a leak at the fuel pump. (I had one on a nother boat. only at high RPMs.) The seal may leak a little and air flow from the motor housing vents and the front engine pooleys, serpentne belts, alternator etc will push the oil everywhere. Took me for ever to find it.
Don't recommend this, but I was in the bilge at FT while some one else was driving and I was looking for the leak. I did find it, $3 part and I was good.
Good luck.

 

[MERPerformance]

I need some help from the experts. Maybe someone has had the same problem or can give me an idea what to look for.

I have staggered 525's in my '05 -- 42 Fountain Ex. When we bought the boat both engines had bad #8 cylinders from detonation and the tops of the pistons were cooked. We had both engines rebuilt. After a short period of time we noticed a fine mist of oil on the starboard saddle tank and some oil floating on the water in the bilge. It seems to come and go and is worst when we run the boat hard at full rpms. If we run easy it doesn't seem to show up. It is directly across from the forward port engine. The mist isfrom the bilge to the bottom of the hatch and all over the saddle tank. My mechanic has gone over every connection, oil plug, distributor seal etc trying to find the leak. It has to be dropping on the driveshaft and getting slung or misting out of something. There are no obvious leaks. Any ideas what it could be?.

Check the harmonic balancer, groove from seal. You can get a sleeve for it. Or maybe the timing cover, it has a o-ring all around it.

 

[gerritm]

Gerr.

Not a motor head here, but try one more thing. It may be as simple as a leak at the fuel pump. (I had one on a nother boat. only at high RPMs.) The seal may leak a little and air flow from the motor housing vents and the front engine pooleys, serpentne belts, alternator etc will push the oil everywhere. Took me for ever to find it.
Don't recommend this, but I was in the bilge at FT while some one else was driving and I was looking for the leak. I did find it, $3 part and I was good.
Good luck.

One of the 2 metal fuel lines going to the back of the fuel filter had oil dripping from it. It was the one closest to the block. Almost looked as if the line was leaking, but it was oil not fuel. The fuel pump is right below the filter housing.When you say the seal, are you talking about the seal that goes between the pump and the block. Is there oil at that point where the fuel pump seals against the block?

We were thinking of the riding in the bilge to check it out. If it wasn't at full throttle, I would be too nervous, but don't want to hurt anyone bouncing around or lose my engine hatches. My luck is they would blow off.

 

[Ratickle]

Is there oil at that point where the fuel pump seals against the block?

Yes.

 

[gerritm]

Yes.

Thanks, I will check it out.

 

[DAREDEVIL]

What do you think would cause this?

Damn,,,they said it all. It could be all of the above.
+ if you have a edelbrok fuel pump ,,it has 2 little holes in the side on the housing,if the inner seal goes bad that is where the oil comes out.

That is what they are for . to see oil ,,so u know its bad. Not kidding either.
A friend of mine just had exactly that 2 days ago.

 

[PARADOX]

One of the 2 metal fuel lines going to the back of the fuel filter had oil dripping from it. It was the one closest to the block. Almost looked as if the line was leaking, but it was oil not fuel. The fuel pump is right below the filter housing.When you say the seal, are you talking about the seal that goes between the pump and the block. Is there oil at that point where the fuel pump seals against the block?

We were thinking of the riding in the bilge to check it out. If it wasn't at full throttle, I would be too nervous, but don't want to hurt anyone bouncing around or lose my engine hatches. My luck is they would blow off.

I don't reccomend the bilge riding either. :leaving:

There is a gasket/seal at the fuel pump and block. Try to wrap paper towels around the area and tape it down so it won't blow around. Drive and see where you might get oil. YOu can try towels different areas on the engine. THis will stop from "spraying" and you can pin point the source better.

 

[Geronimo36]

You may also want to check the RTV seal below your intake manifold at the front/back in the lifter valley area. They have a high tendancy to leak and the oil can usually make its way down the front/back of the block and even down the side of the block where the head/block meet. When it leaks out the back you can ususally see a little oil near the bell housing area and/or on the spark plug wires as they wrap underneath the engine.