Posted 27 November 2003 - 03:04 PM
The real issue is at about 4000 rpm' the engines speed up to 7-8000rpm with no power. I assume this is cavitation (new to jet boats). I can achieve about 20mph before I loose power trying to go faster. Any ideas before I call the dealer. I can repair most things so would like to if I can.
Thanks in Advance!
Posted 30 November 2003 - 08:42 PM
Posted 01 December 2003 - 06:32 AM
Anyone noticed that issue before?
Posted 01 December 2003 - 09:00 PM
Posted 09 March 2004 - 12:42 PM
Not necessarily... The seal around the drive shaft is actually made up of two pieces. A stainless steel plate fixed on the driveshaft and a carbon ring mounted in a rubber "boot". The mating surface of these two parts is where water can leak into the boat, OR, when running, air can be sucked in by the impeller because of the pressure differences created under the boat when the impeller is turning. Water may or may not leak in while the boat is not running. I have had to "adjust" the tension on the seal surfaces to stop water entering the boat, and as a consequence, this greatly decreased if not stopped, the air entering from this point. Confused yet? There are many things that can cause the pump to cavitate. Worn out wear rings (hence the name) from sucking in ANYTHING but water (ski ropes, weeds, sand, etc..) sharp edges in the path of the water traveling to the leading edge of the impeller, or the impeller itself with a damaged blade. Anything that blocks the smooth flow of water will (may) cause the pump to cavitate.
Wouldn't water come into the bilge then through that faulty seal? If you are sitting still in the water that is.
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