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Water in my manifolds small block v8! Help!

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Water in my manifolds small block v8! Help!

Old 08-05-2015, 02:54 PM
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Default Water in my manifolds small block v8! Help!

No oil pressure, no oil in bilge. Water in heads! I'm a hundred miles from the boat. Son and his fiancé we're going to go fishing. Started right up, alarm sounded no oil pressure. Noticed black water in and around carb spewing from air hoses going to manifolds.

My guess is head gasket gave way near exhaust manifold. Or exhaust manifold gasket failed too. It's a 230 HP 5.0 ltr small block V8 mercruiser with a Rochester 4bbl carb. Closed Fresh water cooled engine. Straight inboard (old school) rudder etc... Any ideas?

Last edited by dpowell; 08-05-2015 at 03:39 PM.
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Old 08-05-2015, 03:13 PM
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Originally Posted by dpowell View Post
No oil pressure, no oil in bilge. Water in heads! I'm a hundred miles from the boat. Son and his fiancé we're going to going fishing. Started right up, alarm sounded no oil pressure. Noticed black water in and around carb spewing from air hoses going to manifolds.

My guess is head gasket gave way near exhaust manifold. Or exhaust manifold gasket failed too. It's a 230 HP 5.0 ltr small block V8 mercruiser with a Rochester 4bbl carb. Closed Fresh water cooled engine. Straight inboard (old school) rudder etc... Any ideas?
Tell Son and his fiancé to fish from another boat.
Call mechanic.
Check balance on CC's, or bank account.

What air hoses go to manifolds?

Seriously though, it sounds like you're going to need to do a compression test first, and go from there.
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Old 08-05-2015, 03:35 PM
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There are two hoses that go from the heads on each side to the side of the flame arrestor above the carb.

Yikes! Check the balances huh? Maybe I can sell another kidney on CL...
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Old 08-05-2015, 03:46 PM
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So your saying its squirting black water out the breather hoses ? I'd say the engine is filled to the brim..post some pics.
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Old 08-05-2015, 03:54 PM
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I've ask my son to post the details, I'm getting this info second hand. If the engine ran for a short time the seawater pump may have filled my engine with seawater mixing with oil...

Well, my day is getting better and better.
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Old 08-05-2015, 04:01 PM
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Sounds like crankcase is full of water.
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Old 08-05-2015, 04:09 PM
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Originally Posted by dpowell View Post
There are two hoses that go from the heads on each side to the side of the flame arrestor above the carb.

Yikes! Check the balances huh? Maybe I can sell another kidney on CL...
One more thing. No oil in the bilge? How about on the dipstick?

Do the hoses, from the flame arrester, connect to the valve covers? I'm thing PCV hoses from each valve cover to the flame arrester. Is water coming out of those and into the flame arrester. If so, than the block is, or close to, full of water. If the motor was turned over, and the water got into the combustion chamber, it could hydro lock and cause major damage.

Shane

ADDED ON EDIT; You guys type to fast! Were all on the same page.
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Old 08-05-2015, 04:20 PM
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Heres the story,

There we were, we had just loaded the boat for our 3 day trip. Food, water, etc. I turned the key on the helm and all I herd was cranking with no jump that it was ready to start. In the past when the flame arrestor was removed with one simple bolt with a plastic cover and the round metal arrestor with two rubber hoses was put to the side the motor would start right up. Once the motor is up to running temp the arrestor could be placed back on and the motor would run fine.
This is what did, the motor started right up with no arrestor and ran fine, next thing i noticed the two rubber hoses roughly 1/2" diameter were spitting what appeared to me to be very dark oil. I placed two buckets under the two hoses, one from each head cover. The motor ran just fine while spitting out roughly a gallon from each hose. I than noticed the oil pressure gauge was reading about 5 psi. I shut the motor down to check the dip stick. The stick is very difficult to read but to my eye it appeared to have no oil. I then proceeded to add roughly 1 gallon of the recommended oil into the fill spot, after checking the dip stick it appears the oil is up to its normal level. Thunder storms rolled in and we uploaded the boat. We will return saturday to see what we can discover until than any help would be appreciated.

The boat has the original 1988 5.0 mercruiser, the carb has two hoses running to the port and starboard heads. Ive researched these are to vent the extra vapors built up in the heads. They normally spit out vapors, this evening they sprayed a good amount of Black Oil. Why??
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Old 08-05-2015, 04:35 PM
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That's it I guess, I'll take lots of pictures and post them here.
I can't imagine what that must have looked like to him! Dad's boat, I'm dead! There's a lot more important things in life then a boat, but at the moment I can't think of any...
just kidding. Thanks for your detail Tyler!
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Old 08-05-2015, 07:30 PM
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Still think the crankcase is full of water. Dipstick hard to read with that condition.
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Old 08-09-2015, 02:37 PM
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Default update!

Today we return to the marina to inspect the boat to find some answers to our inboard 5.0 mercruiser issues.

Here's a list of what we did and what we discovered. My father will follow up with the data from our compression tests

1- checked the dip stick. Oil was atleast 6" beyond the full marker.

2- used the extraction pump to pull the oil. 10 quarts of oil was extracted, the manual says it holds 6...

3- went around the entire 8 cylinders removed the plugs and did a compression test.
The plugs are black, gapped properly but definitely have oil or carbon build up.
The cylinders ranged from 135psi to 90psi with a simple compression gauge kit. One cylinder was reading 90, the remainder were 125psi-135psi

4- After the plugs and wires were reinstalled, we wanted to make sure the motor was empty of oil after cranking it multiple times per cylinder for the comp tests. After wiggling the hose into the dipstick tube, 9 more quarts were removed...
How does a 5.0 mercruiser hold 19 quarts of oil??
Last Saturday I put in 4 extra quarts when I could not read the dip, could the motor run with 15 quarts? If not than we have a leak somewhere.

5- After extracting all of the oil, we poured 6 quarts and 6 oz of seafoam in the fill. The recommend amount of oil in the manual.

6- cranked the motor and it started right up! Some white smoke blew out the back, a small amount of black floating carbon was seen with no sheen.

7- motor ran great at low idol, put in forward and reverse, motor dropped to the normal 800rpm no problems/studdering. Temps were checked with the ir thermometer at our test points, everything was normal. Oil pressure was 40 psi at the gauge.

So all is well... For now... The question still remains, why was oil spraying from the very top of the motor from the vapor hoses to the carbs last Tuesday night?
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Old 08-09-2015, 02:46 PM
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Is there water in crankcase? Sounds like blown head gasket or crack on interior of exhaust manifold
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Old 08-09-2015, 03:01 PM
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No way that was all clean oil. None of it had a milkshake consistency? I'd bet that you are pushing water somewhere and adding it to your oil.
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Old 08-09-2015, 03:01 PM
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So..there was no water and someone put 10 qt of oil in it.That's what was shooting out the vent hoses oil.That's better than water,clean up the oil and go run the crap out of it.
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Old 08-09-2015, 03:29 PM
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No milky oil, everything removed has been very very black. Not thick but definitely not milky. It was a guess in the very beginning that water was in the mix. No signs of water has been seen in the motor. We cranked the motor a few times with each plug out and found no water on top of the pistons.
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Old 08-09-2015, 03:34 PM
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Here are the compression numbers on our V8;
#1 - 130psi #2 - 130psi
#3 - 135psi #4 - 120psi
#5 - 95 psi. #6 - 130psi
#7 - 120psi #8 - 90 psi

#7 cylinder actually had gas on top.
The rest of the cylinders were dry, the plugs (new in Spring) were black with carbon, powdery.

As my son said it started right up, I'm happy.
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Old 08-09-2015, 03:39 PM
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Sounds like the engine was overfilled with oil.
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Old 08-09-2015, 03:41 PM
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Any chance the oil smelled like gas a little?

I'd probably warm the engine up and do the compression check on the 90psi cylinder again.

If you have a lot of blow by coming out of the 'vent hoses' that go into the carb you might have a cylinder issue.

How long has it been since you changed your manifolds and risers?

Also, check the coolant, is it low?

You seem to be making oil somehow, it could be fuel, or I guess it could be antifreeze as well. Doesn't sound like it's water or your oil would be separated or look like chocolate milk.
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Old 08-09-2015, 03:42 PM
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Originally Posted by dpowell View Post
#7 cylinder actually had gas on top.
How much gas? Like a puddle/pool or just a slight dampness?
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Old 08-09-2015, 03:43 PM
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Could gas be getting in from fuel pump?
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