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nkorep2
05-08-2012, 12:40 PM
Hello everyone,
Im in the process of my prostar 190 restoration. I just dropped the motor off at a machine shop and can spend some time looking at other parts of the boat. What the heck are these gizmos by the gas tank?

https://lh6.googleusercontent.com/-7hlBq44ue50/T6dIggGYFHI/AAAAAAAACFw/hvQxH9JEtYo/s400/2012-05-06_18-53-24_69.jpg

Also, what are the vent in the bow of the boat for?

Thanks,
Nikolai

mayo93prostar
05-08-2012, 12:47 PM
the tubes are for the speedometers to keep water from getting all the way up to the dash.
the vent in the bow is to vent the bilge.

j.mccreight@hotmail.com
05-08-2012, 12:52 PM
Those are dampners or bellows for the pitot system for your speedometer which compensates for barometric differences.

gweaver
05-08-2012, 12:53 PM
Not sure what the gizmos are for, but the vents in the bow should have ducting connecting them to the bilge/motor box area, so the engine can draw in fresh air. The ducting just runs from the vent down in to the bilge area, it doesn't connect to anything.
G

nkorep2
05-08-2012, 08:47 PM
got it, the vents dont really have the tubing attached, but that makes sense. Does anything need to be done to the speedometer things? There a way to know if everything is in check before I run the boat?

mikeg205
05-08-2012, 08:56 PM
add some tubing...what kind of speedometers do you have...

Cloaked
05-08-2012, 09:07 PM
got it, the vents dont really have the tubing attached, but that makes sense. Does anything need to be done to the speedometer things? There a way to know if everything is in check before I run the boat?You need the pitot assembly to be completely connected for your speedometers to work. The bellows in the pitot assembly need to be inspected for leaks if water has frozen in them over the winter from a clogged pitot.

Flow-thru ventilation is required by law - USCG - for an enclosed or confined area. Hose should very well be connected to assure that you do not get explosive vapors harboring in a confined space subject to spark or backfire or any other incendairy source. I always keep vent hoses connected properly, keeping them in good condition or replace as necessary, keep the blower working (and use it regularly as recommended), and take all precautions to prevent any type of situation that will cause an onboard explosion. I value my life and the life of others onboard. Yes, the vents really do need proper care.

Air intake is not the purpose of venting. The vent hose is ~$0.95 per foot.

.

nkorep2
05-08-2012, 09:10 PM
They look like this right now, I dont know what kind they are, I dont know if they work either.

https://lh4.googleusercontent.com/-ASVtoZcjqnk/T6dKrC5Ih_I/AAAAAAAACHw/qryoHN997MA/s400/2012-05-06_18-49-15_758.jpg

mikeg205
05-08-2012, 09:20 PM
They are the airguide... you need vinyl tubing and and pitots.

http://www.skidim.com/prodinfo.asp?number=769B - pitots...
http://www.skidim.com/prodinfo.asp?number=5100632 - tubing...

pitot - on stern in water thru stern to bottom of damper...rest to back of speedo's if they work... pull the dash and see if there is any tubing there... if so gently blow into tubing and see if needle moves if so - they might work

make sure you have the ventilation like cloaked says... you should have vents in front of boat somewhere and a blower with something that looks like black dryer hose running thru floor of boat.

Do you have any vents on the stern of your boat?

nkorep2
05-08-2012, 11:56 PM
I do have vents on the back.

https://lh3.googleusercontent.com/-PBGyQtA00h4/T6dIGuXhvSI/AAAAAAAACFQ/KzUnt5smLBQ/s400/2012-05-06_18-54-39_746.jpg

So if I understand correctly, the vents up front are there to bring fresh air into the engine compartment. The dryer-like plastic hose needs to be attached from those and run to the engine compartment. Then, another hose needs to be run from the engine compartment, back to the stern of the boat to a blower and out to the vent?

Here's what im imagining in my head...

https://lh5.googleusercontent.com/-k_sw7tUW2cA/T6nqm_f8xFI/AAAAAAAACLE/ZRoD-hYVl90/s400/Mastercraft%2520Vent%2520Hose%2520Diagram.jpg


I do have the pitots on the back, from the outside they dont seem like they are in bad shape but who knows if they work, I will look at the speedos next week when I pull the dash apart and remove the windshield as well while I wait for the motor to be cleaned and checked out at the machine shop.

thatsmrmastercraft
05-09-2012, 12:05 AM
I do have vents on the back.

https://lh3.googleusercontent.com/-PBGyQtA00h4/T6dIGuXhvSI/AAAAAAAACFQ/KzUnt5smLBQ/s400/2012-05-06_18-54-39_746.jpg

So if I understand correctly, the vents up front are there to bring fresh air into the engine compartment. The dryer-like plastic hose needs to be attached from those and run to the engine compartment. Then, another hose needs to be run from the engine compartment, back to the stern of the boat to a blower and out to the vent?

Here's what im imagining in my head...

https://lh5.googleusercontent.com/-k_sw7tUW2cA/T6nqm_f8xFI/AAAAAAAACLE/ZRoD-hYVl90/s400/Mastercraft%2520Vent%2520Hose%2520Diagram.jpg


I do have the pitots on the back, from the outside they dont seem like they are in bad shape but who knows if they work, I will look at the speedos next week when I pull the dash apart and remove the windshield as well while I wait for the motor to be cleaned and checked out at the machine shop.

Good diagram..........that's it.

mikeg205
05-09-2012, 07:33 AM
NKO you have the right traits to get a full blown case of OCD with your MC - great diagram as well :D