Water in oil pls help(long)
 

After 18 hours or perfect running I've got water in my oil. milk milk milk.NEW 502 carb modified to 540 hp. Imco exhaust, Corsa Captain's Call,hp500 intake , holley carb, Mercury oil thermostat(500 hp) large oil cooler 160 thermostat with 1/8 hole drilled. Was using mercruiser 25/40 oil.Lake water up here in BC Canada is Cold .Water temp never got up much past 160, oil temp would take a long time to get past 160. would get to 200 -210 after a hard pull. My DELIMMA>>. Developed a engine miss over 3500 rpm. Changed all ignition components, checked jets, water sep filter etc etc. After lake testing for about the 5th time opened the engine cover and just about puked. Chocolate milk out of the breathers and all over the engine. checked the oil and it was milk.. Did compression test 175 lbs, leak down test, 12-18 %, all gaskets fine. Tested oil cooler fine Removed heads and had them magna fluxed, checked out fine.. My engine builder suggested that maybe the combination of low water/oil temps,25/40 oil, caused so much build up it just puked it out. Reassembled everything flushed out motor. 160 thermostat no holes 10/30 oil . I ran it for about a hour water temp 160-190(up and dowm) oil temp 200,checking the oil every 10 min or so.Everything ok. Opened it up to 4500 for about 5 min,ENGINE MISSES AND ALL THE MILK IS BACK. PLEASE any suggestions would be GREATLY appreciated. Thank you!!!


Syringa:confused: :confused: :confused:

Did you have silent choice before? If so do you still have the stock flappers in the Y pipe that goes down the back of the motor? I had the same problem with mine when I ran it with the exhaust in the closed mode. MILKY OIL. Found the old flappers had broken off and were down in the bottom of the Y pipe blocking off the water flow and causing the water to back up into the exhaust. I removed the flappers completly and the problem went away?
It is not easy to see the flappers if they have broken off and are in the very bottom- use a bright flashlite.

Tinkerboater, info like that is what makes this board so great. Bet you won't find that in a merc manual anywhere. Sounds logical to me.

Tinkerboater>> Thanks for the reply and suggestion. Yes the boat had captains call before. Will I ever be PIssED and RELEIVED if that is all it is. Like I said i can run the thing under 3500 and no problem over 3500 a miss and milk. From all the other things I checked the integretity of the motor seems fine.

Thks again this board is THE BEST !!!

syringa

Let us know if you find the pieces down there. And don't install the new style they wont last very long. Just go without them.

Well maybe?? just maybe Tinkerboater might of found the problem. Took off the diverters and the port flap is gone. Poked around with a wire and at first i couldn't hear anything then i must of rattled it loose. Took off the exhaust bellows and there was the flapper. Gee it's only 11:30 PM here. If it wasn't dark I would try it right now. I'll let you know

syringa

Well I guess I just couldn't be that lucky. Everything ran fine opened it up for 3-4 min to 4500 rpm , the miss started and then the milk came. I'm at a loss on this one. Suggestions???

Syringa

Bad intake gaskets will miss and fill your motor with water.

Just a wag.

Good luck

Do you know which cylinder is / was missing? Check the intake to head area for water getting into the port. Are any of your bolts (intake or head) streached and / or bottoming out preventing the proper seal? Is the intake manifold cracked? Cracked block? I don't know if a system pressure check would show anything.

Do you have Gen 4, 5, or 6 combination? There have been sealing and gasket problems when mix-matching components and gaskets, especially head gaskets!

The engine is a NEW Gm crate 502. When I took it apart to have the heads magnafluxed I checked all the gaskets and they were fine. Reassembled using high quality gskts. I am convinced the miss is caused by the oil /water/puke/coming out of the breathers and screwing up the fuel mixture. Thks for the replys

syringa

i second the intake gasket. had the same problem with my street car, would run fine cruisin around town. When you sprayed it down a couple of times started smokin and oil in water. seems runners were large enuff in the head that the gasket wasnt sealing with much and would give in under enuff of a load.

Rob

What bothers me here is the fact that it ran good for 18 hours. What if anything changed to cause this problem? I will guess that during the first 18 hours you beat on it enough to know that it was o.k. I am going to ask you a stupid question, you are not running that motor hard with that Captains Call dumping your exhaust through the prop are you???

Hey checkmate>> At this point there is no such thing as a stupid question. Believe me I tried running it with the captains call open or closed and you don't even have to pound on it for the problem to show up. Like I said prev. I ran it for a hour at 3500 no problem but as soon as i open it up to 4000 4500 the puke starts coming out of the breathers. Higher rpm takes about 3 min to contaminate the oil with water slower rpm (but over 3500 takes a bit longer. I'm stumped.

What is you water system?
 

Are you running a crossover and a bypass hose or the stock Merc T-stat housing with the tee for bypass and stock water recirc. pump? Do you have a water pressure gauge? If not, I highly recommend one. It sounds very much like intake gaskets leaking is a very high possibility. I assume during the 1st 18 hrs of break in, you babied it and didn't do any high rpm runs? Possibly with the 160 stat and the cold lake water temps, you are having trouble getting the stat to open enough to flow all the water. A stat starts to open at the stated number and then fully opens as temp gets higher.
Say your temp is fine at idle or even cruise, you aren't flowing max amount of water at this point. The stat is open enough to relieve the excess water. But once you open up the throttle, you are flowing more water. More of this cold lake water will actually close the stat some, now you have more restriction= high water pressure. This high pressure gets relieved by blowing past your intake gaskets and right into your oil. Try running a 5/8" or a 3/4" restrictor instead of the stat. Just make sure your water pressure doesn't go higher than 25psi. 18psi is really the disired number at WOT.
Been there done that. Speaking from 100% experience, not text book theory.
Good Luck,

Jerry

I had the exact problem. I mean EXACT. The boat ran fine until wide open or above 4000rpm. It would miss and sputter. The Oil had water also. It is a leaky riser gasket. It is washing out the spark and you are dropping a cylinder. It will clean itself out and run but comes back. At slow speeds the water is not flowing hard but at speed it is sucking like mad. Fix both gaskets at once for sure.

Well maybe i'm getting somewhere. On the advise of US1 Fountain I ordered a water pressure gauge which wil arrive tomorrow. I took out the t stat and ran it at 3500 4500 and WOT . No miss and nothing coming out of the breathers but the oil is still milky even after 2 changes. I will change the intake gaskets next but want to know what the water pressure is first.
Thank you all for the replys and good advise

syringa