Outdrive help

[Bigolbill]

Does anybody know what this small hose goes to from the transom to the outdrive? It was disconnected when I got back to my house. Goes into a zerk fitting on the outdrive.

[mmwjr]

That’s the speedometer air tube. There is a small hole in the leading edge of the drive that takes in water when underway which compresses the air in this hose which then cause the speedometer needle to move.

[Bigolbill]

That would make so much sense considering that my Speedo would intermittently not work. Thank you so much!

[mmwjr]

Originally Posted by Bigolbill

That would make so much sense considering that my Speedo would intermittently not work. Thank you so much!

You’re welcome.

[jrsick]

That is a pitot system and measures pressure from a port on the leading edge of the outdrive. Look down the outdrive and you will see a small notch. Clean that out with a paper clip.