78 Merc 1400 outboard grey sludge out the exhaust?

[mrrrl]

Hi All,<br /><br />I was working on my boat in the driveway and was running the engine and noticed that when I shut it off I had a lot of grey sludge/foam coming out from the exhaust thru the prop.<br /><br />I thought it was the oil/water seals leaking from the bearing carrier. So I replaced both the front seals and the rear o-ring. Replaced everything and filled the lower unit with oil.<br /><br />I ran it again and it still has the grey sludge/foam coming out.<br /><br />Now is this because it is sitting in the driveway idling and the grey sludge/foam is just unburnt fuel and oil?<br /><br />TIA for the help

 

[corm]

Re: 78 Merc 1400 outboard grey sludge out the exhaust?

Hi Mrrrl,<br />Yes, all it is is unburnt oil and water mix.<br />It is normal in smaller amts. If you have great gobs of it you may have to rich of mix or a miss<br />causeing excess fuel to be discharged down the exh<br />tube.