bad temperature sensor? or incorrect engine flushing

[glajos42]

Bad fuel gauge? bad temperature sensor? or incorrect engine flushing

This was done on a 1997 Challenger 1800

So I am a newbie to the boating world and especially how a rotax works. I read the manual a couple of times on how to flush the motor and searched through the posts here on how to do it and I am still confused. I do the flushing from the upper connectors. I understand that you have to start the motor and then turn the water on to that motor. The part that I am confused about is whether or not I need to pinch the hose as the manual shows? Other posts here say you have to while others say it is not necessary if you are using the upper connectors.

I read some more posts on this and one other item to mention is that my fuel gauge is not working. I just read that it might be due to the boat thinking it is out of gas. I have about a half of tank of gas in it, So I was wondering if there is a fuel sensor that could be bad. This would explain why it beeped when starting each engine???

Since this is a new boat I wanted to make sure the motors ran fine before taking it out. So I tried to flush the motor in the driveway and this is what happened. I hooked up the hose to one of the engines, started that engine and then turned on the water (I did not pinch the hose after the T connector). After about a minute of the engine running I started to get the continuous beeping (beep, beep, beep, etc) that indicates the engine is overheating. Before the beeping started I tried to rev up the engine and it sounded like the engine would not rev all the way up. I then put the engine in forward and it would rev up higher. This was about the time beeping started. I then switched the hose to the other engine and repeated the steps. On this engine the beeping started immediately, does the computer remember that the other engine had the high temp warning?

To summarize...
Do you need to pinch the hose when flushing?
Does the computer remember that the other engine had a alarm?
And does the engine restrict how high you can rev the engine while in neutral?

 

[99speedster]

try this...

I'm not the expert..but this is what I found on mine...

"Do you need to pinch the hose when flushing?"

Yes you do AFTER the engine has been started and running--ie; start the engine then clamp the hose off to allow the water to pass into the engine.


If you dont clamp the hose off, you will simply let the cool water bypass the engine--like you found out....and YES the boat will still sense the "non running" engine is overheating--and as you seen you'll get the buzzer.:willy_nilly:


"Does the computer remember that the other engine had a alarm?"

2 seperate systems here--but they are some-what connected. Well it's a simple "active" buzzer your hearing, if it's going off, it currently see's a problem. When you turn the power back on and any motor is in a current overheating status, (like probably happened to you) it will buzz you...But if your asking if inside the processor "computer" if it stores "codes" showing a overheating situation--that would be a NO...


"And does the engine restrict how high you can rev the engine while in neutral?"

Yes it does to somewhere around 2,000+/- or so...

and to answer your concerns about the fuel gauge, no this will not trigger the alarm.

have fun

 

[timmyboy76]

I'm not the expert..but this is what I found on mine...

"Do you need to pinch the hose when flushing?"

Yes you do AFTER the engine has been started and running--ie; start the engine then clamp the hose off to allow the water to pass into the engine.


If you dont clamp the hose off, you will simply let the cool water bypass the engine--like you found out....and YES the boat will still sense the "non running" engine is overheating--and as you seen you'll get the buzzer.:willy_nilly:


"Does the computer remember that the other engine had a alarm?"

YEP, when you turn the power back on, it will buzz you if either engine is overheating.


"And does the engine restrict how high you can rev the engine while in neutral?"

Yes it does to somewhere around 2,000+/- or so...

and to answer your concerns about the fuel gauge, no this will not trigger the alarm.

have fun

what you talk'n about. Use the flush kit, mounted under the engine hatch, WITHOUT clamp'n anything, and turn motors on, then water. Half the pressure will go out the back, other half will travel thru water. You use the back flush port or pinch the line, you'll create to much pressure for the engines to overcome it, thus...flood'n the motors.

 

[glajos42]

I am now leaning towards the fuel gauge (float) being the problem. I disconnected the wire near the tank and watched the gauge drop way down past empty. Then did the jumper wire trick and the gauge went up to full. Plugged everything back in and the gauge drops down to the under 1/4 level. I ordered the kit from seadoosource.com. Hopefully that fixes the problem.

 

[roneagan@cfl.rr.com]

Use the under hatch ports!! I have been using mine for 9 years like that without a problem... I can run it for 5 mintes without and issue.. you should see some water running out the exhaust, that is a sign that you have water
flowing through the engine cooling system.. The hose has a T on it and water flows in both directions, out the back and through the engine...