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  #1  
Old 10-25-2015, 04:56 PM
maxpower220 maxpower220 is offline
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Water in oil, good compression

Went out this weekend before winterizing. Got home and was draining the oil, opened the oil caps to notice white gunk in each. Obviously from moisture. Oil was pretty clear where I could see. Pulled all of the plugs and noticed a little water drop on #6 plug.

1997 PS 205 with 5.7L and 1:1 tranny. I have 1165 hours and the motor runs fine. Did a compression check all cylinders were either 185 or 190.

I'm pretty sure there is a leak from the exhaust (original) that allowed water in, but haven't pull them yet. Does this sound possible?
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Old 10-25-2015, 07:12 PM
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Very possible and your lucky you caught it before something bad happened.
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Old 10-25-2015, 07:34 PM
Fullpass Fullpass is offline
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Water marks on the outside of exhaust manifold/riser gaskets...good chance of leaking on the inside...two of the 4 riser bolts on each side will be a pain to remove...the bolts are hardened, they will come out, cut down an allen wrench to fit in the casting, if new bolts are going back in, make sure they are hardened, may half to put a small pipe on allen for more leverage.
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Old 10-25-2015, 07:37 PM
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I would suggest removing both manifolds from the heads. Look inside the runners that lead to the head ports......do you see any trace of rust from water entering the head?
If so, I'd replace both manifolds and risers. 18 years old manifolds and risers, you should replace them together at this point.
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Old 10-25-2015, 07:40 PM
Fullpass Fullpass is offline
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Both exhaust flappers on...no back flush issues. Just checking
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Old 10-25-2015, 09:23 PM
maxpower220 maxpower220 is offline
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Yes, both flappers on.

Yes, notice rust on the backside of both manifolds. I had planned on replacing soon due to age. I check the oil level on it every day I take it out. Nothing on the dipstick though, only on the oil caps.

I've sprayed all of the bolts with PB Blaster and will try to get to it tomorrow. Realistically, my season is over anyway, so I'm glad it waited and that I did not miss any weekends or feel the need to repair it immediately.
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Old 10-26-2015, 08:23 AM
ac505 ac505 is offline
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Given the damage that can be done when an exhaust manifold goes and water starts going where it shouldn't, would anybody suggest just replacing manifolds and risers when the boat gets to a certain age as a precautionary measure?
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Old 10-27-2015, 10:27 AM
maxpower220 maxpower220 is offline
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I got the risers and manifolds off. First, I don't see a lot of gasket material left. I have not replaced them in 3.5 yrs that I've owned it. Now, I don't think they have ever been replaced.

Definite difference on the left and right sides. Left side normal, right side has more rust. Risers look OK with "normal" rust for age and hours. Plastic drain nuts on both exhaust manifolds are leaking. Water jackets look clear of obstructions with surface rust.
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Old 10-27-2015, 10:29 AM
maxpower220 maxpower220 is offline
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last picture is left side
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  #10  
Old 10-27-2015, 10:34 AM
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Shaun R Shaun R is online now
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I think you got your moneys worth out of them, it's time for a full replace. My boat is older with less hours and this is on my winter project list. Only difference is I don't have water in my oil yet.
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