Speedometer broken!!

get_sum · Soul Rider Joined: 04 Aug 2008 Posts: 395 City: Edmond

Okay.. So my speedo has been broken for a while now. When it first went, I was able to get it back with a lot of speed and it worked for a while. Then, it just finally wouldn't came back.

I disconnected the tube from the back of the speedo and blew it out with some compressed air. Reconnected it, still not working.

I tried to lightly blow some air into the speedo while the ingition was on to see if the diaphram was working, and it wouldn't register.

So, in the time being I'm gonna use my navigation unit for speed.

Do you think I should install a separate line for the new speedo, or use the potentially clogged one?

Commodore · Ladies Man Joined: 20 Jun 2005 Posts: 11636

I have no advice for you, but I haven't used a speedo in over 5 years. Unless you have PerfectPass, then I would fix it.

They just notoriously break on these kinds of boats.

JUST-IN-TIME · Posted: Aug 28, 2008 4:32 pm Post subject:

so if u blew air into the line and it did not register then u got bad speedo

but have a friend check the other side of tube to see if air is coming out

GuitsBoy · Posted: Aug 29, 2008 5:23 am Post subject:

I hope you disconnected the tube from the back of the gauge before you blew it out with air. Compressed air will easily rupture the diaphram in the back of the airguide style gauges. Might also check the pitot tube itself. you may need to pick some gunk out of the intake with a paperclip or something.

get_sum · Soul Rider Joined: 04 Aug 2008 Posts: 395 City: Edmond

it's on an i/o, so the pitot is a part of the stern drive unit itself and I can't discern where the pick up is for the speedo.. Looks like a new speedo diaphram or new unit is in order and I'll run it with my GPS for accuracy as well...

Is there anyway to take it out of the stern drive and put a conventional pitot on the back and keep it from forcing water into the boat?

GuitsBoy · Posted: Aug 29, 2008 12:05 pm Post subject:

Sure, but you might have to run a new tube if the one thats there wont reach. Theyre pretty cheap too.

JUST-IN-TIME · Posted: Aug 30, 2008 10:09 am Post subject:

what i/o?

get_sum · Soul Rider Joined: 04 Aug 2008 Posts: 395 City: Edmond

Mercruiser Alpha with a 4.3L motor

JUST-IN-TIME · Posted: Aug 30, 2008 4:03 pm Post subject:

the tube is in front f the unit
u will see a black tube

get_sum · Soul Rider Joined: 04 Aug 2008 Posts: 395 City: Edmond

Thanks.. I'm going out tomorrow, so I'll look at it when I pull it out of the garage..

ghind · Newbie Joined: 08 Sep 2008 Posts: 4