Water in gearcase, 1987 - 70 hp

[Grant Brown]

When I drained the case on my '87 70 Hp, the synthetic was all cloudy and about a teaspoon of water came out at the end. I winterized everything else but it was cold so I got lazy and didn't change the oil. <br />While reading some other posts I noticed some references to fibre washers/gaskets. My boat had rubber o-rings on the vent/drain screws when I bought it. <br /><br />Question 1: When I fill the case and tighten the vent screw (with the o-rings), oil will pour out when I remove the filler pump from the drain hole, but not as much as when the vent is opened. Is this normal? I thought that it should be like holding water in a straw with your finger on the top end so nothing runs out.<br /><br />Question 2: A buddy said that if I run it on the muffs for 10 min or so and then get water in the oil the leak is in the water pump somewhere. True or false?<br /><br />Question 3: Where is the next logical place to look for a leak? It doesn't drip any oil even when sitting in the sun all day, even after being run on the muffs.<br /><br />I bought the proper vent/drain gaskets today but haven't had a chance to get out on the water yet to test them.<br /><br />Thanks for any input,<br />Grant

 

[Nos4r2]

Re: Water in gearcase, 1987 - 70 hp

If you get water in the lower unit from running on flushmuffs you have a big problem-I can't see any way for it to get in there unless you've got a crack in the casing.<br /><br />It won't drip oil with that amount of water in-it's a lot easier for a thin fluid like water to get in than a thick fluid like gear oil to get out.<br /><br /><br />Personally (but remember here I'm a fussy so and so!) I'd strip the whole lot and check it all.

 

[MortenH]

Re: Water in gearcase, 1987 - 70 hp

Hello<br /><br />Try to pressure test it to see if there is a leak.<br /><br />-M-