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Lower Unit Question

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Old 08-20-2003, 02:04 PM
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Question Lower Unit Question

I have IMCO lowers on my boat. I almost lost a prop when the nut backed off while I was running. My alarm went off when my drive oil got low. I stopped and raised the drive to find the prop barely on the shaft. I thought I had lost a prop seal. When I pulled the boat out and removed the prop, I found that my oil drain screw had come out and was gone!!!

Anybody ever heard of or seen anything similar happen?

My alarm definitely saved me a chitload of $$$.

Dean
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Old 08-20-2003, 02:15 PM
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That's not that uncommon...When you change your gear oil, you SHOULD run the boat on the hose & shift it a couple times & THEN retighten BOTH fill & drain plugs because VIBRATION WILL loosen them up a lot of times...Obviously you had a vibration from the prop nut NOT being properly "tanged" & torqued which vibrated the drain plug out...Your welcome.......
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Old 08-20-2003, 02:24 PM
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I thought I had everything tightened up properly. I had run the boat for about 11 hours when this happened.
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Old 08-20-2003, 02:29 PM
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Always retorque your prop after a short run. They almost always will be loose. Never had a drain plug fall out though.
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Old 08-20-2003, 03:11 PM
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Thanks for the help.
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Old 08-20-2003, 03:53 PM
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I had a prop come loose 2 weeks ago. Never felt it and it looks like there was no damage. Just baffled me how it could back off the lock nut and tang. I'll be checking the drain plug when I get home tonight!
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Old 08-20-2003, 04:05 PM
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Cord,
Mine was the same thing. No vibration or warning of any kind. If my drain plug hadn't come out to set off my alarm, I am confident it would have lost a prop...
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Old 08-20-2003, 04:34 PM
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I just happened to notice that it was sloppy on the shaft when I was checking the leading edge for nicks.
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Old 08-20-2003, 07:51 PM
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FYI, most common thing is finger tight prop nut after a few hours of running following prop install. This could cause slop on shaft resulting in metal fatigue, broken shaft or drive parts. Buy a torque wrnch and use it.
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