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Old 02-23-2006, 04:37 PM   #1
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waterproof cap and rotar

i dont know if i am missing something, but i went though a river the other day and the engine got splashed and i got water in my cap and rotar, i took it off and there was water in it because i kept losing power and dropping RPM's. so is this just a freak accident or is the a way to waterproof the cap.
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Old 02-23-2006, 09:04 PM   #2
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As I understand it from a boating website I just read that automotive rotors and caps have breathers, some caps even have a small hose barb to vent it thru a tube. Only marine caps and rotors are to be sealed to prevent ignition of explosive vapors trapped in a closed engine compartment. When I was a kid working in a carwash we used a spray that displaced water to help start cars that died halfway thru the wash. It was called "PIB" or "PIM" I think. Hope this helps.

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Old 02-23-2006, 09:25 PM   #3
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WD-40 = Water Displacement formula 40; developed for the military to displace condensation in missile guidance systems. If you're having water problems - spray it in there and try starting the engine again.

If you want to seal your cap - you can try either getting a large oring that you can stuff in there if the cap has a groove (check http://www.allorings.com ). Or you can seal it off with some silicone - but it makes getting it off tricky. Also; twist off the breather cap and put a small hose plug on there.
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Old 02-23-2006, 09:45 PM   #4
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I read an article on this a few years back that said to rub a little oil on one of the surfaces before applying the silicone. This will only allow the silicone to adhere to the other surface and still keep it water tight. As KBart mentioned there still needs to be a breather to allow the heat and gases to escape. This article suggested a nipple be installed in the cap and a hose run to a higher location with some kind of one way valve on the end.
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