Speedo Not Working

[Acer2428]

Hey all:

I just bought this boat. It's got an '81 (I assume it's orig) 115 Merc on it. Not pitot tube to replace. Which tube is it that leads to the outdrive?

What should I check?

Should I just go to a pitot setup?

Thanks,

Sam

 

[Silvertip]

Re: Speedo Not Working

A speedometer is simply a pressure gauge that's calibrated in MPH. It has a small diameter tube on the back that runs back to either the pitot on the engine (if it has one) or to a separate pitot. It's apparently disconnected at the engine or pitot, or the tube is pinched somewhere along the line. If it had a hole in it or was disconnected from the speedo your feet would be getting wet.

 

[Acer2428]

Re: Speedo Not Working

Well the boat hasn't been in the water yet! lol. It supposidly has no leaks. I guess I'll just have tot race the line and see if it's connected?

If it is, try blowing in it? Will I be able to generate enough air pressure with my mouth if it's functioning normally?

If there's a clog, what's the best way to get it out, compressed air?

Thanks.

 

[Acer2428]

Re: Speedo Not Working

The line appears to go into the lower unit.

What's my next move?

 

[Blue Water Runner]

Re: Speedo Not Working

Take a very small drill bit and stick it in the hole in the lower unit inlet. You may have to turn the bit by hand to clean out the hole. You can also blow it out from the other end with compressed air. I just cleaned mine out.

 

[Acer2428]

Re: Speedo Not Working

Will give her a shot, thanks.