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Engine overheating

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Toona

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I have a 2001 seadoo xp that starts and runs great on land hooked up to the hose. I took it to the lake and didn't even get out of the marina before a horribly loud beep. I rad in another thread to pull the gray temp sensor and the beep went off. So that definitely narrowed the beep to the engine overheating. I saw I should look at the intake under the machine and it was totally clear. Any other ideas to check?

The oil had been sitting in the machine for over a year when I bought them. So, I pulled the tank and drained it, changed the filter and put brand new oil in. I'm at a loss
 
Do you remember if water was coming out of the pisser when it was running in the water?

You might have something stuck in the port inside the jet pump.
When running it on the hose, the water flows in the reverse direction as when in the water and an obstruction in the jet port would not show itself.
You can run it on the hose and look into the back of the jet. See if water is flowing out of the port.

Or, with engine off, you can put a mechanics mirror into the jet from the rear and try to look inside the port. Could be a lizard or something crawled in there.
 
Also check the condition of your wear ring. If the wear ring is shot, it will not create enough pressure in the jet pump to force water thru the motor
 
The oil doesn't go bad so changing it will not cause or prevent overheating. Also what oil did you use.

As said above when on the hose the water flows in the opposite direction as in the lake. If the jet pump isn't moving water or you have something plugging the system it will overheat.
 
FL-Rider said:
Do you remember if water was coming out of the pisser when it was running in the water?

You might have something stuck in the port inside the jet pump.
When running it on the hose, the water flows in the reverse direction as when in the water and an obstruction in the jet port would not show itself.
You can run it on the hose and look into the back of the jet. See if water is flowing out of the port.

Or, with engine off, you can put a mechanics mirror into the jet from the rear and try to look inside the port. Could be a lizard or something crawled in there.
Click to expand...
I don't remember if it was coming out or not. But I know when is hooked to the house water only comes out of those two holes.
 
mikidymac said:
The oil doesn't go bad so changing it will not cause or prevent overheating. Also what oil did you use.

As said above when on the hose the water flows in the opposite direction as in the lake. If the jet pump isn't moving water or you have something plugging the system it will overheat.
Click to expand...
Thanks for the tip on the oil. It was very low though. I used:
Sea-Doo/Ski-Doo XPS 2 Stroke Synthetic Oil Gallon 779127 https://www.amazon.com/dp/B075Y6SN1M/ref=cm_sw_r_cp_apa_i_uoQIDb7JERSQ2
 
FL-Rider said:
Do you remember if water was coming out of the pisser when it was running in the water?

You might have something stuck in the port inside the jet pump.
When running it on the hose, the water flows in the reverse direction as when in the water and an obstruction in the jet port would not show itself.
You can run it on the hose and look into the back of the jet. See if water is flowing out of the port.

Or, with engine off, you can put a mechanics mirror into the jet from the rear and try to look inside the port. Could be a lizard or something crawled in there.
Click to expand...
I looked underneath the ski and it is totally clear. I also took a mirror and looked into the port and didn't see anything obstructing but I'm not totally sure what to look at in there. I've been reading this that says:
The result of all that whirling, at least on the inlet side of the pump, is the creation of negative pressure. It’s this pressure that “pulls” or sucks water into the pump cavity. As the water passes through the swiftly rotating impeller, that pressure becomes positive. The impeller is now “pushing” the water back toward the pump outlet.
So, if I'm understanding this correctly, inside this cavity there is an intake valve that "pulls" water back towards the engine, via negative pressure. So, when I get back home today, should I look from the back of the ski in the port for little holes that could be obstructed?
Jet-Pump-1.jpg
 
No, the water behind the impeller is pressurised and forced under pressure to a hole in the side of the pump that then goes to a hose inside the ski. There are no valves or anything. If the wear ring is worn out there is too much clearance between the impeller and pump and there is not enough pressure at the side of the pump where the cooling inlet hose is to force water into the cooling system.

It is much more common to have a sand blockage of a cooling line than the wear ring causing a loss of pressure but not unheard of.
 
Looking into the back of the pump near the 11:00 position you can see the port.
You can look at the port while running engine on the hose and you should see water coming out. If there is no water coming out or a weak stream, disconnect hose and clear the hose. If there is no blockage in the hose, check the hose nipple on engine.
 

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No, the red circle is where the water goes in when running in the lake. Water should come out of them when running on the hose.

The white straws are the bilge pump that sucks water out of your bilge from the low pressure created by the jet plast.
 
mikidymac said:
No, the red circle is where the water goes in when running in the lake. Water should come out of them when running on the hose.

The white straws are the bilge pump that sucks water out of your bilge from the low pressure created by the jet plast.
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Ah, that makes sense. Okay, thank you for the clarification. I'll check it tonight
 
Mine looks like this
 

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Toona said:
Great news. Can I push pressure through the hose from the engine side to clear the hose? Or is there a diaphragm or something that would block that?
Click to expand...

There is no diaphragm. However, if backflushing it by running the engine on the garden hose doesn't make water come out the holes inside your jet pump, you will have to remove the cooling hose to see what is clogging it.
 
put an inline strainer on the cooling system or you'll run the risk of getting sand or shells in your cooling fittings. I had this issue on my old SPX and my 2stroke boat. They get jammed in fittings and you'll never know which one.
 

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Remove the lines on exhaust and confirm you have water flowing through them
I have had the small water elbows and in-line connectors blocking up restricting flow
You can also heck you are getting water out of the exhaust system
If you are not then the cooling system flow is restricted causing the water to heat up causing the over temp
Remember it’s water flow you need and the amount of water coming from pump
Does it over heat on hose in the trailer ‍♂️
 
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