View Full Version : Water in the engine
florida gator
09-16-2002, 11:28 AM
I have a 1990 GT 210. It keeps taking water into the cylinders. I have had the timing checked, risers & manifolds replaced & flappers installed. Has anyone else had a similar problem? What else can I try to eliminate this problem?
Rootsy
09-16-2002, 01:22 PM
might want to shoot us some specifics about the motor as well as circumstances as to when it happens as well as a history such as overheating, etc...
Gritz
09-16-2002, 03:13 PM
With what you have changed, the most logical place to me would be a leaking head gasket, which is normally a result of an overheated engine and warpped head. :(
Hopefully not a cracked head or block from freezing. :( :(
My 2 cents.
Stan
Stuart
09-16-2002, 04:43 PM
I feel your pain. Had water in the oil and learned the hard way about guesswork. After many motor pulls, I know what not to do.
Who put your motor together? Did they seal the head bolts? Were the heads and block decked? Is the intake manifold sealed well? Water can come in at all of these places.
What cam do you have? High lift cams can cause reversion.
Which cylinder has water?
How much water do you have?
Do you have a thermostat?
florida gator
09-16-2002, 07:18 PM
The engine is a 5.7 with OMC Cobra outdrive. The water is coming into the cylinders. It is not always the same cylinder. I have had compression checks with little variation, so I did not think it was a problem with the head / head gasket.I live in Florida, so I can pretty much rule out cracked block from freezing. It has been under different circumstances almost every time. Sometimes I will be idling & it stalls. When I try to restart, it will make a noise that seems like the motor turns backward & then it will completely lock up. Another time it ran fine, I went back to the marina before a storm. When the storm cleared I tried to start it & it was locked up.
Jamesbon
09-16-2002, 07:22 PM
Check the seal between the water passages in the intake manifold and heads...
...and what MadPoodle said...and to "second Stuart," all SBC's need to have the head bolts coated with sealent, since, they're tapped into the water passages. (guess how I found that out...?)
Hope this helps!
Gearhead99
09-16-2002, 08:08 PM
Sounds like a headgasket or cracked head. The water is getting in the cylinder to lock it up.
Leaking headbolts will leak to oil.
Also, exhaust manifold can cause this.
Should be easy enough to find. When it locks up. Pull the plugs and see where the water is. Then check the exhaust first. Then pull the head. Eyeball the intake, have seen alot of 5.7 chevy trucks with bad intake gaskets lately. Also, check the head gasket. Send head out and have it check and surfaced if it isn't cracked.
Better do it soon. It will get worse and let you down. You can also bend a rod with water in cylinder. Been there done that!!!
I noticed you say your engine seemed to kick backwards when you went to start. That will suck water is no doubt. I would go over everything running it on a flushette that will minimize sucking water in, it sounds like the timing could be off causing it to kick back. But if you do have water vapor getting in to the intake track sometimes that will make it fire back also. We recently had a 502 EFI rot the water passage through on the aluminum intake. It had a range of funny problems before it ran real bad and was brought to the shop.
G - FORCE 88
09-17-2002, 09:06 AM
Just my .02 cents. This freind of mine who races offshore told me that everytime before shut down rev your motor to 2500-3000 rpm's to get as much water out of the manifold and risers as possible. Over time as your motor is on and pumping water the manifold and all the cooling parts of the mototr fill with water,this is natural. But while in shut down you may suck some water in through a valve... this leading to a whole mess of problem. ie frezzing, sucked valve= head job, watter in the cylinders. This is a precautionary method I was tought. After shut doown water will still be runnig out of the motor you should see it running out the exhaust. I dunoo if this is right ... what do you guys think cistineb
florida gator
09-17-2002, 09:36 AM
That's something I can try when I shut it down. Would your friend shut it off while it was still revved, or when it comes back down? I have had times when the boat was idling, and stalled. Then it was too late. I plan to have the heads done in the off season to eliminate that possibility. The only problem is, in Florida we don't have much off season.
Rootsy
09-17-2002, 03:22 PM
well gee wiz... if it does turn out to be the cylinder heads i happen to have a set of factory castings with valves... all should be just peachy with them... check my for sale stuff in the parts for sale...
funny but a while back there was this discussion with someone else on the board... and i've seen this a few times on sbc's... if they crack or warp heads or develop leaking head gaskets they love to suck water back into the cylinders... one trouble spot is right between the valves in the combustion chambers, especially on lightweight head casting. generally it should be the same cylinders time after time filling up and it usually doesn't happen until the motor is warm. that turning backward or kicking backward notion is the result of a cylinder filling with water and the piston, along with the rest of the rotating assy coming to an abrupt halt...
G - FORCE 88
09-17-2002, 03:53 PM
Gator,
When you gonna shut down rev the motor to 2500-3000 rpms for about 30-45 seconds, this will get unwanted water out of the motor. Works for the racers works for me. It wont hurt give it a whril.
wink
Gary S.
09-17-2002, 04:18 PM
If I remember correctly on our '86 27' Sportcraft we used for charters,,, Mercruisers manual said NOT to shut down over 1000 RPS or that could suck water in.
G - FORCE 88
09-17-2002, 04:43 PM
You are absolutely right... Rev the motor and let it come back to an idel before you shut the motor down. It works everyone should do this preventive tip. smileybo
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