Bad exhaust flapper/Water in oil

[Flyinb]

My main reason for this post was to determine how water was getting into my oil. The reason i thought it may be a flapper valve is first symptom i noticed was trying to restart engine after stopping and determined water was getting into the cylinders on one side, checked the flapper and it was bad on that side so i replaced them...great, easy fix...not. Ok checked the riser gaskets, (per advice given here) the one one the side with water was bad and standing water in manifold. OK...thats how water is getting into the cylinders but i am still not convinced that is how water is getting into the oil as well, oil is totally white.(Convince me it is please).
After taking off both risers and manifolds i did a compression test Not very accurate as it was not up to temp but got 110 to 130 lb readings. Did a pressure test on the cooling system. Blocked it all off put in 15lbs pressure. Now this is the first time i have done this so i am no expert...It takes about 5 minutes for the pressure to leak out, sprayed soap water around my fittings to see if they where leaking, they seem fine. I can here a faint air leak but it seems to be coming from the water pump, mayby the seal? Is that possible? Would a cracked block be more obvious? Just trying to be 100% sure there is a leak in the block before replacing the engine.

 

[Bondo]

Re: Bad exhaust flapper/Water in oil

Ayuh,... Anything is possible,...

Change the oil, 'n Try it...

 

[elkhunter338]

Re: Bad exhaust flapper/Water in oil

If you stopped slowly I doubt it is bad flapper. The flapper is to prevent water from rushing up the exhaust.
I had no exhaust flapper for years with no trouble. I had trouble when at 20mph my boat just stopped running then when it came to a stop water went up the exhaust and into the engine.
You could have a bad manifold, head gasket, possibly other issues.

I think I would run it on the garden hose for awhile see if the water re enters the oil.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Yes plan to try it when i get my new flapper valves for sure before tearing into it any farther. I guess how important the flappers are depends on where the engine is mounted in relation to the water line of the boat. my engine sits down at the bottom of the V hull and with a load on the boat the water line can be right up there towards the top of the engine. I am hoping for the easy fix...can ya tell?

 

[Turn-n-Burn]

Re: Bad exhaust flapper/Water in oil

definitely replace the flappers....if you have to remove the exhaust manifold and risers...inspect it and the riser and the gaskets.....do a leak test with acetone on the manifold.....also would try the engine cooling pressure test......I had a head gasket blow......was just a tiny indication.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Just have to remove the elbows so will leave the manifolds on for now and hope for the best.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

OK finally got around to testing out the boat after replacing the flappers. Just ran it on the hose at home, up to temp a few times. More water in the oil and blew water out one spark plug hole on one side after removing them. will remove manifold and go from there. How do you do a leak test with acetone?

 

[Don S]

Re: Bad exhaust flapper/Water in oil

Why don't you just pull the riser off the manifold and inspect the gasket surfaces. That's where the problem usually is.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Why don't you just pull the riser off the manifold and inspect the gasket surfaces. That's where the problem usually is.

Thanks Don, That was my first plan of attack. If that gasket is bad would it allow that much water (maybe 1/4" on the dip stick in 30 minutes) into the oil as well as at least one cylinder? One interesting thing i noticed while test running the engine was the riser on the side where i found water in the cylinders was way cooler running than the other side.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Got the riser off the exhaust manifold, without a doubt the gasket is shot and there is standing water in the exhaust, quite a bit of rust flakes in the riser also, so that would be where water is getting into the cylinders. But i am still worried of a cracked block because of the water in the oil as well. Legit worry? Guess i will have to figure out how to pressurize block and see what happens or just put on a new gasket and try it out.

 

[Bondo]

Re: Bad exhaust flapper/Water in oil

If that gasket is bad would it allow that much water (maybe 1/4" on the dip stick in 30 minutes) into the oil

Nope,.... That sounds more like a Cracked Block....

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

OK...Drained the oil and measured it, don't think there was as much water in oil as i thought, maybe just foaming up the dip stick looked like more but it sure is creamy white. Anyway plane to check compression on cylinders and try and pressurize the cooling system tomorrow and go from there....ahhh...where is a good place to get a new engine just in case.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Update...Checked the riser gaskets, (per advice given here) the one one the side with water was bad and standing water in manifold. OK...thats how water is getting into the cylinders but i am still not convinced that is how water is getting into the oil as well, oil is totally white.(Convince me it is please).
After taking off both risers and manifolds i did a compression test Not very accurate as it was not up to temp but got 110 to 130 lb readings. Did a pressure test on the cooling system. Blocked it all off put in 15lbs pressure. Now this is the first time i have done this so i am no expert...It takes about 5 minutes for the pressure to leak out, sprayed soap water around my fittings to see if they where leaking, they seem fine. I can here a faint air leak but it seems to be coming from the water pump, mayby the seal? Is that possible? Would a cracked block be more obvious? Just trying to be 100% sure there is a leak in the block before replacing the engine.

 

[Don S]

Re: Bad exhaust flapper/Water in oil

Drain the cooling system, isolate the block from the exhaust cooling and pressure test the block. You may be able to hear the leak.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Drain the cooling system, isolate the block from the exhaust cooling and pressure test the block. You may be able to hear the leak.

I already did that, explained in my last post but still not convinced the block is cracked yet.

 

[Flyinb]

Re: Bad exhaust flapper/Water in oil

Being optimistic i tried to eliminate the simple/easy fix stuff first instead of going with my gut. Well turns out my block is cracked, at least on the outside just below the head but i am sure its cracked internally as well. so far got the intake manifold off and no cracks i can see there. Going to order a long block regardless. At least i found i had a bad flapper and the manifolds are shot as well.