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Airguide Troubleshooting |
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8122pbrainard 
Grand Poobah 
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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 Topic: Airguide TroubleshootingPosted: September-17-2011 at 4:35pm |
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Tom,
Yes, you are correct. The system is by air pressure and yes if there is a leak, it allows water into the pitot tubing and dampener. In fact, another common problem is a crack in the air bellows inside the speedo. This will allow water all the way up into it. That's an easy problem to detect since the speedo then pees water onto the driver!! Yes, if the dampner is split, get some thin copper and sweat on a patch. |
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76tique
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Joined: April-12-2009 Location: Nyack, NY Status: Offline Points: 226 |
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Posted: September-17-2011 at 2:24pm |
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Thanks Pete, so if I understand it correctly, a leak in between the pitot and the speedo allows water to fill the line, instead of air pressure building to operate the speedo? By "balance tube", I actually meant pulsation dampner. Wasn't sure what it was called, thanks for setting me straight. Thanks for the heads up on the freeze damage! I do have a cup or so of water in the bilge after a day on the water...i'm guessing if the dampner is cracked, I can probably solder it to repair?
Time to take a peek and see if I can find the issue without pulling the fuel tank... |
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8122pbrainard
Grand Poobah
Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41045 |
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Posted: September-17-2011 at 2:02pm |
Check your pulsation dampner for leaks as well. They are known to fill with water due to pitot tubing leaks forward and then freeze over winter. Are you taking on water anyplace? No, blowing compressed air back through the system will not hurt it as long as it's regulated below 30 PSI. |
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76tique
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Joined: April-12-2009 Location: Nyack, NY Status: Offline Points: 226 |
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Posted: September-17-2011 at 1:28pm |
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My port speedo was DOA when I bought the boat this spring. I have been fooling around with it all summer - first discovered that the original airguide pitot was missing the brass insert in the end. I filled the hole where the brass plug was with silicone and the speedo came to life for a day, but was reading low. Next time out, it was dead again. Replaced the pitot with a new venturi-type unit from Skidim, and the speedo came back to life, but was reading low still. It died halfway through the day.
When I removed the tubing to connect the new pitot, quite a bit of water came out. I'm guessing that's not normal...Should I suspect bad pitot tubing, or a leaky connection somewhere in between the speedo and pitot? Any suggested steps to continue troubleshooting? I was thinking of disconnecting at the speedo and blowing compressed air back through the line in case it is partially clogged somewhere. Could this harm the balance tube in the stern? Advice much appreciated, thanks guys! |
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76tique wrote: