Reply With QuoteHawaiian,the gardenhose supplies way too much water to your engine,hence the cooler temp.I suspect you have a restrictor a tad small on your exit,that slows the flow too much.What diameter size hoses you run for your cooling?
When I run it with a hose it stays real cold. However when i run in the river with the gate valve wide open it runs at 180 degrees to 240 degrees. Is there a problem with the pump? the pump seems to be ok. I also back blew the gate valve and water did come out of the nozzle. Last year I did not have this problem? Any help is appriciated.
Thanx
Hawaiian,the gardenhose supplies way too much water to your engine,hence the cooler temp.I suspect you have a restrictor a tad small on your exit,that slows the flow too much.What diameter size hoses you run for your cooling?
3/4" from the jet to T. 5/8" through out the rest.?
your hose size is right,so I would look into the restriction scenario!
Hawaiian, try changing your gate valve to an actual restrictor valve. They look very similiar on the outside but are actually made to restrict flow, where a gate valve is not. A gate valve uses small discs in conjunction with the brass gate to seal off the flow. If aren't used at either the fully open or closed postion it will vibrate the discs (this is not audible in a boat) and can soon cause the discs to come loose in the valve. This can restrict the flow but can sometimes be hard to discover because different flow pressures may affect it differently (i.e. garden hose vs. feed from your pump) The restricter valves are about $6.00 at any plumbing store. Maybe this will help. I am new to jet boats but not to plumbing. Good luck! -Shane
Is there any downside to making another hole in the jet on the opposite side of the hole already there? Twice the water, right?
Bump, http://free.***boat.net/ubb/confused.gifsuction housings usually have two waterholes ,what jet you're running?
if it's a YJ JACUZZI it has a screen in the impeller side ,try to remove the nipple and see if it's free of debris.[This message has been edited by spectras only (edited June 26, 2001).]
[This message has been edited by spectras only (edited June 26, 2001).]
[This message has been edited by spectras only (edited June 26, 2001).]
Can i bad seal in the Jet housing be the culprit. I fill the housing and it seems to drain into the flow? I think.
Hawaiian, any chance you loaded up your block with sand, silt or weeds? Only times(twice)
the old Tahiti ever ran hot, this was the problem. Try removing drain plugs on either side of block after running some water thru from garden hose. Residual water in block should run out freely. If not, probe into holes with a small screwdriver. If still no flow, turn hose on LOW and see what happens. If you can't get any water to come out, you may well have a block that is full of debris. I actually had to remove my freeze plugs to get sand out on one occasion.
When I rebuild an engine,the first thing I do is drilling and tap the drainholes for a garden hose fitting [brass] so after running into some sandy conditions I can hook up the garden hose to this fitting and reverse flush the block.If you don't get the sand out ,it will pack your block filled up with hardened sand,thus insulate the main bearing caps from the water.It then can cause the bottom end to overheat and destroy the bearings. The expandable plugs in the frustplug holes are an other alternative to quickly removing sand if you have acces to them between the exhaust manifold and stringers.These plugs would withstand the waterpressure from the bowl no problem.
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