Water in 3 and 4 cylinders

[Racer75]

I have a miss at 5000 to10000. Did compression check and found 1 and 2 have 175 psi 3 and 4 300 psi because of water. Spun motor over many times and water kept comming in. Where can water come from when out of water? Boat is on trailer in garage. I read a thread about exhaust manifolds rotting. I pulled off manifolds and they look like new. No pitting or corrosion. Any help is much appreciated.

 

[Jlhtec]

Do you have the water turned on, when running the compression check? If not, water in the airbox?

 

[Racer75]

No water. Only what is left over after loading. The airbox has to be remove to remove plugs for compression check .

 

[Looper7]

How long have you cranked it with the spark plugs out?

 

[zipper]

Not clear, Did you run the hose without the engines running? Not sure what head gaskets are rated for but 300psi can't be good.

 

[Racer75]

Cranked motor over 20 seconds at a time. So in all about 2 minutes to clear out water out. But when # 3 was checked I got 185 Psi comp. Then #4 had water comming out again. So I cranked engine a few more times to clear. Checked # 3 at 180psi and water comes out 4. I am going to pull the head off tonight to check it out. It has to be easy to find if it leaks with no pressure.

 

[Babin Farms]

So your boat is out of the water and no hose is hooked up but you continually get water from the spark plug holes??? This is very interesting. ?

 

[Racer75]

It has to be leftover water from running. I was thinking it would have to be all from the exhaust. Evidently not