Cooling problem... STUMPED

[adet16v]

Ive been having a problem with my 701

Running single cooling routed into bottom of exhaust mani -> up through cylinder -> out the head -> into bottom of head pipe (b-pipe) -> out the top of the headpipe and to a T fitting splitting into the stinger and overboard.

I recently had to replace the steering cable so I removed the gas tank and battery then since i had that out i pulled the pipe to repaint the headpipe since the original paint was pealing.

Put everything back together and went to Erie for the weekend... In the lake I thought it was running hotter than normal but never went into safe mode from the temp sensor... got it home and took it out and it went into safe mode after only a few minutes... water is still coming through the pisser but it doesnt seem to be as much as before. There was lots of ******** floating around the lake so i thought maybe I had a clog...

I went through EVERYTHING and made sure of no clogs, took it back out again and same thing again today. Runs for a few minutes, I feel the pisser get hot, and it goes into safe mode.

WHAT COULD BE WRONG??? :aargh4:

Oh and i know its not the temp sensor f'ing up because if i tap the cylinder with a wet hand i can see it steam.

 

[douglee25]

Could there be an air leak in the suction line somewhere?

Doug

 

[Matt_E]

There is no suction line in the cooling system. AFAIK, the pump forces water into the cooling line, it isn't sucked in.
So, to have reduced cooling flow, you either have a blockage or you have a (pressurized) leak.

 

[adet16v]

how would i find a leak? put it on a hose and look for one? another way

another possibility?

 

[keefer]

Yup a pressurized leak would do it but if he just removed the headpipe, I dont see where that could have caused it. I have seen calcium buildup and bits of aluminum from the casting get lodged in the water outlets. I'll bet something is causing a blockage and reducing the flow. Have you checked the tee fitting for flow?

 

[keefer]

Have you tried using a garden hose and flowing water through the headpipe only? Maybe reversing the hoses on the headpipe would help by changing the direction of the flow and breaking loose a blockage.

 

[sflsurfrider]

try flushing it on a flush kit. another option is to take each hose off one by one and force compressed air through them.

 

[cookerq62]

He has pulled every line and fitting on this ski as well as the head checking for sand in the jugs. Can Messed up plugs or Msd cause this? Or a messed up stator vien? I really have no clue what it could be after checking for obstructions. If there is plenty of water going through it how is it over heating??

 

[sflsurfrider]

are you sure you got the water feed line and syphon bilge hooked up in a non-backwards way?

 

[adet16v]

as cook posted, last night i checked ever hose on it, the jugs, exhaust mani, head and headpipe for obstructions.

it is definitely drawing water, just seems that it is weaker flow...

 

[adet16v]

are you sure you got the water feed line and syphon bilge hooked up in a non-backwards way?

yes, positive.

 

[Matt_E]

If it's weaker than before, it ain't getting the same amount of heat removal as before. That's what's causing your overheat.

Put it on the trailer, and back it in the water. Have the cooling hose removed from the pisser fitting.
Rev it and check the flow from the hose. Then disconnect the line at the headpipe and repeat.
Work your way backwards until you find the weak flow culprit.

 

[douglee25]

There is no suction line in the cooling system. AFAIK, the pump forces water into the cooling line, it isn't sucked in.
So, to have reduced cooling flow, you either have a blockage or you have a (pressurized) leak.

I knew someone was going to respond that way... I guess I should have said 'feed line' instead. :smile:

Doug

 

[MADMAT]

You have a bad head gasket or head o ring seal. We are going thru this right now on a sj. Runs fine till it heats up and then the leak in the gasket/ or ring turns the water to steam and the pisser stops pissing and starts gargling. Then no water at all then overheat sensor kicks on.

 

[WaveDemon]

If it's weaker than before, it ain't getting the same amount of heat removal as before. That's what's causing your overheat.

Put it on the trailer, and back it in the water. Have the cooling hose removed from the pisser fitting.
Rev it and check the flow from the hose. Then disconnect the line at the headpipe and repeat.
Work your way backwards until you find the weak flow culprit.

that is how I found a problem with my brothers cooling. :arms:

 

[MADMAT]

You have a bad head gasket or head o ring seal. We are going thru this right now on a sj. Runs fine till it heats up and then the leak in the gasket/ or ring turns the water to steam and the pisser stops pissing and starts gargling. Then no water at all then overheat sensor kicks on.

I could be way off on this but we have tried everything else!

I'm puttting the head back on tonight with fresh orings/1211 and we'll see what happens.

 

[Matt_E]

I fail to see how a head gasket leak can lead to so much reduced flow that the motor overheats.
Either the motor would run like crap from all that water intrusion, or the bilge fills up with water.

I may be way off on this.

 

[adet16v]

I could be way off on this but we have tried everything else!

I'm puttting the head back on tonight with fresh orings/1211 and we'll see what happens.

I dont see how that could cause such a reduction in water either, especially without being able to notice the obvious difference in performance due to the leaking head gasket... but i could be wrong. Let me know if that fixes your problem.

I always keep my ski in the bed of my truck so im going to have to try to borrow a buddies trailer in the next couple days to try to figure out the problem... looks like thunderstorms/rain tomorrow (friday) in pittsburgh but maybe ill be able to get it out.

 

[Frosty]

This may not apply however; my buddy had a similar problem, and here is what ended up being the problem.

He sucked up a rock which in turn bent one of the blades of the impeller. That seemed to have airated the water so much that it caused not only reduced waterflow but also ran the airated water through the cylinder (much of it became steam). His cylinder and pipe were running extremely hot. Hot enough to cause some minor cylinder scoring and slight melting of cooling lines. Being an SXR the temp sensor was disconnected to install the b-pipe.

Sounds fantastically rediculous however, once we replaced his impeller with a nice new shiney one the problem completely went away.

BTW, the bent impeller piece of the blade was the size of a quarter and bent and quite a serious angle.

Anyway, good luck, and keep us posted with your results.

 

[Mouthfulloflake]

I have noticed a difference in water flow with a new perfect inpeller with a TIGHT clearance VS an old wore out impeller.

it was a pretty obvious difference in pisser output, with no other changes made.