1993 Johnson 60hp 3cyl Lower Unit Question

HybridMX6

Senior Chief Petty Officer
Joined
Oct 22, 2008
Messages
676
Hello. I'm finally getting this thing buttoned back up after having it torn completely down for a rebuild for approx. 6 months. I re-installed the LU yesterday on it, and removed the drain and fill screws to re-fill the LU back up, and I'd say a few ounces of water come out, then some oil. I'm confused as to how the water got in there. I drained it back in November all the way as far as I knew. It had been sitting on my back porch since then, although the shift rod cover was installed most of the time, but the shift rod was not in it most of that 6 months. I did have a screwdriver stuck in it to keep animals from getting in. I got the o-ring finally installed in the shift rod, re-installed the shift rod cover with a new gasket, and re-installed the shift rod. I then pressure tested it with a bicycle pump that has a gauge and a LU drain/fill adapter that comes with the LU gear oil change kits. It held 12-15psi for over 2 hours. So, where/how did water get in it? Did it happen just from climate change between last Nov. and now and slowly build up in there? I have no way to water test the LU on a boat in the water, my boat has an engine already on it and is not set up for remote steer/control. I simply put new fiber washers on the drain and fill screws after refilling it for now, just got me a bit concerned about how water got in it like that. The oil was not milky like it had mixed with the water, just separate. I plan to sell it in the next few weeks if I can, but need to know from more experience mechanics on these as to the LU, or if there is a different way to test the LU, or if the fact that it held 12-15psi for over 2 hours shows it's good to go, and the water must have come from climate change. The winter in FL was hot, then cold, then hot, then cold, with a decent temp change every couple of days it seemed.
 

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1993 Johnson 60hp 3cyl Lower Unit Question

i use the nylon seals on the drain and vent screws. these seals are a one time use item. it sounds fine.
 

HybridMX6

Senior Chief Petty Officer
Joined
Oct 22, 2008
Messages
676
Re: 1993 Johnson 60hp 3cyl Lower Unit Question

Yeah, they were nylon, not fiber. I had a brain fart. They came in the LU re-seal kit I bought for it when I got the motor. It has little rubber o-rings or something built into the screws it looks like, and with the nylon washers it doesn't seem the screws go in all the way flush any more, is that an issue? The rubber o-ring looking things don't come off, at least not easily, and I don't want to rip one if I need it.
One other thing I just remembered, one of the screws has a magnet to catch metal pieces. When I got the engine it was in the fill/top hole on the LU, so I put it back there, but should it be in the bottom one? I wouldn't think the metal would flow up to the magnet, but I don't know, maybe it's designed that way, so thought I'd ask.
 
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