Clogged speedo tube

I have a clogged speedo tube...I have read that I need to blow it out towards the gear case with air and that I should clean the hole with a 1/16 drill bit.

It has not worked thus far and it has been clogged since I have owned the boat (8 years) but I want to get it working.

What can I do?

The drill bit barely goes in, less than 1/32 and I see some metal. I then took a small pick tool and dug all the dirt out and it looks like the metal is laying horizontal but I can stick the pick in above and below a little. Should that metal be there?

I have tried sticking a #12 wire down the tube without much luck.

Should I spray anything down the tube or can I tear the lower unit off and get better access?

Please let me know any bright ideas as I would like to get this working.

Thanks!!!

Ok I figured it out...the metal is a broken drill bit about the size of the hole.

Any sugestions on how I get that out?

I wish I knew who broke it off in there so I could send them a nice thank you note!!

[boats.net]

Getting a broke drill bit out will be extremely difficult to do without damaging case. You can get a pitot pickup that will bolt to boat transom.