Water in oil, checking block for leaks with head off?

[arrkerr]

I had quite a bit of water in my oil in my last run, which has been the first and only good run of the season so far. When I pulled the boat out of the water I checked the oil and found it milky and up maybe a quart.

I had figured it was a head gasket, but after pulling the head the gasket looks great (at least to my untrained eye). I do see some moisture under the gasket around cylinder #1 where the water passages are, but that could have happened when I pulled the head off.

I checked the head for warpage against a level, and it looks pretty dead on.

Another thing to note - I never had any symptoms of water being in a cylinder. I'm thinking that it got in there directly, which would mean in the head or block. Makes even more sense now that I see the head gasket looks OK.

I'm thinking my next step is to pressure test the block, and I'm looking for advice on the best way to do that with the head off (or I can put it back on I guess). Block off all of the water passages in the block and add air to to the freeze/drain plug?

Attached are pictures of the block, head, and of the #1 cylinder which, while not damp at all, looks like it might have seen moisture or something in its life, although may or may not be related to the current problem.

Any other random advice from the guys that have seen this 100 times before would also be appreciated

Thanks guys, sure appreciate the help!

 

[bruceb58]

Re: Water in oil, checking block for leaks with head off?

Before you took the head off, I would have suggested to pressure test the cooling system.

 

[arrkerr]

Re: Water in oil, checking block for leaks with head off?

Ya, I was just wondering if I could pressure-test the lower half easily with the top off. If not, putting the head and manifold back on is pretty quick job.

 

[Bondo]

Re: Water in oil, checking block for leaks with head off?

Ayuh,... If you bolted a Plate where the head goes it could be done,...
Probably easier to just put the head back on...
The Manifolds are done seperately....

 

[arrkerr]

Re: Water in oil, checking block for leaks with head off?

Alright, will do then, thanks.

So are you saying I should leave the manifold off, or put it back on, for the test? Not sure it its easier to block off the cooling system with it on or off.

 

[Bondo]

Re: Water in oil, checking block for leaks with head off?

Ayuh,...The manifolds are Not water ported, just Hoses....
They have Nothing to do with the motor's water passages....

 

[arrkerr]

Re: Water in oil, checking block for leaks with head off?

Silly silly me. Of course they aren't.

So, put head on, block host that goes TO the manifold, and shoot air in the freeze plug hole, and listen for leaks? Since I've got the rockers off, all valves should be closed as well.

Am I thinking stright now?

 

[Bondo]

Re: Water in oil, checking block for leaks with head off?

Am I thinking stright now?

Ayuh,.... Alittle bit straighter,.... Maybe.....

I can't see what you've torn apart, nor where....
The Easiest place to introduce the air is through a Drainplug hole,... It's 1/4" pipe thread...
15psi is Plenty...
You need to block off All the hoses,...
The 1 coming from the drive,+ any Going to the manifold...
The Big hose from the T-stat to the circulating pump can stay...

 

[arrkerr]

Re: Water in oil, checking block for leaks with head off?

Perfect, thanks, thats exactly what I needed!

I may have torn this thing down too far, but man - sure feels good to understand how all of this works now. I need to see to understand