2006 GTI engine over heating

[quickstrike]

After rebuilding this 06 gti I took it for a run 10 min in it started capita ting no power and a steady beep. I guess that's like limp mode.
I checked the coolant it was boiling mostly water so I flushed it out with the hose and put some antifreeze.
When I run it on the hose I get water out of the back but not the front pisser.
After 5 min running on the hose the exhaust was warm not burning hot. but the engine was really hot.
I'm sure the coolant is flowing because I didn't tighten the hose clamp and the pressure when revved made the hose come off and splash hot coolant on me.
I'm just not sure the sea water is getting in to cool off the seadoo
What do I check ? and how does water get inside when not on a hose?

 

[LouDoo]

Moving this to the 4-tec PWC forum.

Lou

 

[AircraftDoc]

Ok, let's get the numbers off the engine. Located at the forward side. And the numbers on the hull. Aft? Step area?

 

[Coastiejoe]

The ride plate is the HEAT EXCHANGER. This means you MUST be in water for the heat exchanger to function. If not, the CLOSED LOOP engine coolant will simply go from the engine and storage tank, through all the passages it normally does including an oil cooling loop, to the heat exchanger (that will not cool anything as you are not in the water) and simply return right back to where it started only hotter. As the cycle happens over and over,, it gets hotter and hotter.

Running it on a hose will NOT cool the engine. It wil only back-flush the raw water supply to the exhaust.

 

[quickstrike]

Okay that makes sense. So the ride plate functions as the exchanger.
I got these numbers off the hull. 6bcxm1.505gn.

 

[Coastiejoe]

As a side note, running on the hose should be about a minute is all. Two minutes max. For a couple of main reasons. 1). Damage to the carbon seal. 2). Engine over-heat issue.

 

[quickstrike]

So I just got back from the dock. I ran it for about 4 min then it overheated. At the dock I checked the engine it was very hot exhaust was warm. And the ride plate at the bottom of the seadoo was cold. Should I take the ride plate off and inspect or is there a easy / better way? Thank you for your help Joe.

 

[Coastiejoe]

Sounds like the impeller is feeding water to the exhaust as it is warm. There is a separate. Water pump that moves the closed loop cooling. I'm guessing the pump is bad or something is blocked.


Repairing and selling iPads, iPhones and Mini iPads.

 

[quickstrike]

So I'll check the pump. I saw a thread on removing the housing. What's inside ? Just the impeller?

 

[quickstrike]

What position should the water valve be in on the hose and in the water. I'm talking about the hose that goes to the hose connection.

 

[quickstrike]

Okay water pump housing is off easy job it looks good. The impeller looks new as well as the thermostat.

I think I'm going to flush every line with the hose that's should be okay right?
Should I start the ski to see if the impeller is spinning?
Thanks again.

 

[quickstrike]

Okay water pump housing is off easy job it looks good. The impeller looks new as well as the thermostat.
View attachment 25731
I think I'm going to flush every line with the hose that's should be okay right?
Should I start the ski to see if the impeller is spinning?
Thanks again.

 

[Coastiejoe]

Flushing the lines can't hurt. It will help to isolate the issue.

I would crank the engine but not START it to see if the impeller turns. If all is good then I would be concerned out a head gasket, it may be blocking a passage.

I'll post a picture of how the coolant flows later today. I'd make sure all passages are open while flushing.


Repairing and selling iPads, iPhones and Mini iPads.

 

[quickstrike]

So I flushed all the lines and the impeller spins.
Only clog I see is from pisser holes.
I guess tmrw I'll take of the ride plate.