Unless the oil looks real bad, I wouldn't change it until you figure out where the water is coming from because it will just get back in there and ruin the new oil. If you do change it for the moment, just use a lesser expensive oil because you are going to need to change it again shortly.

If it is in the cylinders the possibilities I can think of are:
-Leaky or bad risers / gaskets (very common, and easiest to fix)
-Leaky or bad exhaust manifolds / gaskets
-Leaky or bad intake manifold or gaskets
-Blown head gasket
-Cracked or rotted cylinder head
-Cracked block

I'd suggest to start looking at the items at the top of the list, and work towards the bottom (hopefully you won't have to go too far down, as things get complicated and $$ down there!)

Mike, empty your PM box. I need your phone #, just missed your call and the number listed on my caller ID won't go through. Russ

My email: [email protected]

Offthefront
I have two sets of merc center rise manifolds, spacers and risers from my 311, they are fresh water and in mint condition if you need them email me at [email protected] . I also have heads, intakes and carbs (330 hp) Jeff.

Decent numbers. Strange to see 5 & 6 so high,(still water in them??) but all within 10%, which is good. The 4 center cylinders (4,6--3,5) are the most prone to get ,water with a leaky exhaust riser gasket.

I'd still do a leak down on them just to be sure. I've seen cylinders with 140+ psi that had 50% leakage.

Thaks guys for all the info ...will keep hacking away at it ..after oil change (water) oil filter (water) about 2 oz oil in each cylinder then plugs back in hand tight .....spun pretty good ...will keep post coming ....Russ ....Emptied it twice ..contacting OSO ... Cell is 904 422 4806 ....home 904 278 8056 ..Mike ..

Mike, will call you sometime today or tonight. Russ

I struggled with a small water leak all last season, and as mentioned above I have my motors torn down now. I just found out that one of the heads is cracked.

Well, looking at the glass half full perspective, at least I found the problem...

Go through everything now! The compression test didn't catch this, and performance-wise this motor ran great last year, just a very small amount of water was leaking in. Maybe a leakdown test would have caught the cracked head?

Oh well, at least I have a line on a set of heads...

B O A T

Bring Over Another Thousand

Thought it was Break Out Another Thousand





AND EMPTY YOUR MAILBOX , OFFTHEFRONT

you guys are cruel ..... Anyway we are pulling the motor ..alot easier to work on and can GET to everything ....... My Merc guy is asking about NO circulators .....sez MERC or Jasper will not warranty without them ....I know why they are not there .....give me some input .....thanks ... less$$ Mike