Milky liquid from prop??

[Flounderhook]

2003 Mercury 25 2 Stroke Outboard.I have a milky liquid coming out from center of prop while I am running with mouse ears attached. I stored boat for winter, took it out ran it on the water. Lower unit oil was not milky color when I checked and I have sinced replaced the oil. I ran motor for a while 20 min or so and it is still coming out???

 

[Scali]

Re: Milky liquid from prop??

I had same sort of thing, 40 Merc after first couple usage after winter layup.<br />Is it sort of like thick light brown scummy looking crap coming from exhaust ?<br />I think it's just a residue from the fogging oil burning off..

 

[Flounderhook]

Re: Milky liquid from prop??

You described it exactly, makes sense about the fogging oil burn off. Thanks for the reply.

 

[RyBisp]

Re: Milky liquid from prop??

Originally posted by Scali:<br /> I had same sort of thing, 40 Merc after first couple usage after winter layup.<br />Is it sort of like thick light brown scummy looking crap coming from exhaust ?<br />I think it's just a residue from the fogging oil burning off..

 

[RyBisp]

Re: Milky liquid from prop??

How long did it take for the oil residue to burn off? I am having same symptoms on a 40hp 4cyl., Thought it was catostrophic.I pulled the lower unit off and checked lower unit out, all is good there. Thats as far as I have gone so far.

 

[Scali]

Re: Milky liquid from prop??

I've got the same engine, 1994 40 4 banger,<br />It's less & less after each use as the fogging oil residue burns off..<br />I used my boat 3 times this season thus far, short trips only burned 6 gallons & I didnt see anything yesterday after flushing it.<br />The only other thing I thought it could've contributed to it was some of the marine grease & sealer, wd 40 I used in the LU when I did my waterpump couple weeks ago but that wouldnt come out of the exhaust I dont think.<br />What else could it be if the gear oil is good ..<br />It's just a little oil scum , looks like the oil mixed with moisture or condensation over the winter & slowly comes out looking like turkey gravy .. <br /><br />I'm no Marine Tech but I believe this is the situation & as I noted it clears up after you use the engine for a couple hours ..

 

[RyBisp]

Re: Milky liquid from prop??

Great ! I appreciate it.I just hope its not something else. Do you know how to check the crankcase oil or if it has any. I am sure it does. I originaly thought this may be the source. Thanks

 

[Scali]

Re: Milky liquid from prop??

Gearcase you mean ?<br />Theres no crancase oil, it's a 2 stroke.<br />Thats why you add the 2 stroke oil to the gas, I hope your doing that !<br />Or if it's oil injected making sure the tank is full & the oil injection system is working & all maintence items done.<br />Crack the fill screw to sample gearcase oil..