Spedo pitot on 89 80 Merc

[petriw]

Does any one know where the speedo pitot is on a 1989 80 horse Merc? I have looked everywhere on mine and I can't find one which leads me to believe that it doesn't have one. What kind of set up do I need to get my speedometer working?

Thanks for your replies.

Wade

 

[jebeebe]

Re: Spedo pitot on 89 80 Merc

There should be a tiny hole in the leading edge of the lower unit just above the gear houseing and a tube coming out just above the cavitation plate, if yours has one. My 89' 150hp had one................Jerry

 

[petriw]

Re: Spedo pitot on 89 80 Merc

Yes i did find it. It is there but the speedometer is not working. What do I do to determine if it is the speedo or the pitot?

Wade

 

[Willyclay]

Re: Spedo pitot on 89 80 Merc

The easiest one to check first is the speedometer that works on compressed air in the line caused by the water pressure from the pickup. Just shoot some LOW pressure compressed air into a line connected to the fitting on the back of the speedometer. Vary the pressure if possible to check the movement of the indicator. If that checks okay, then put your boat in the water with the water pickup line to the speedometer disconnected from the meter end. Put it somewhere you can monitor and see if water is being pushed through the tubing when the boat is underway. That should tell you where the problem is. Good luck.

 

[petriw]

Re: Spedo pitot on 89 80 Merc

Thanks very much I will give that a try. As a side note my boat has a small leak I can't find. Now I am wondering. if that might be the problem. A hole in the line? Hummm!