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Discussion Starter · #1 ·
Some temperatures predicted well below freezing soon - good idea to drain lower unit and put fresh lube in.


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Not a hard job at all , remove lower screw first. Put a catch pan under lower unit. Look at the screw - very end is magnetic. Tiny hairs of metal are OK - but bigger pieces mean trouble. Wipe it clean and remove small washer.



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Remove top ( vent ) screw and see how lube looks. Depending on brand - it should be a gold or green color. Milky means water got in - exact reason to change it. The seal (s) need to be replaced - job for mechanic.

I let it drain about an hour or so. Trim engine a kiss up / down helps get last drips out.

Refill with hand pump - most marine stores carry them.



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Be sure to use proper fluid for your engine brand / HP. Pump until lube comes out vent hole. Put on new washer and install.


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Have lower screw ready - undo the fill tube and quickly screw it in. Don't fret a kiss of lube coming out. Double check both screws are snug - wipe up any lube.

I then trim engine up so I can remove prop (s). I pull prop off and the large washer under it.



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This lets me check the seal for fishing line. Never know if you picked up some when near docks / bridges / etc. I put marine grease on shaft and reinstall washer and prop. I pull my props around July - just to check. One year I found some braid - luckily before seal was damaged.



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Very easy job - maybe hour total but can save you $$$$$ from a burst lower unit.
 

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Discussion Starter · #12 ·
Jim - I do not put any thing or the threads. The top ( vent ) has lube from it coming out when filled. Lower ( fill ) has lube when fill is unscrewed.

FWIW : I use a large square shank screw driver with open end wrench on it to break screws loose. I push hard on screw driver so tip does not slip - gently turn wrench to break them free.
 
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