White smoke, exhaust hose busted, water pump??

[shute421]

Yesterday, I took my 88 Baja with a 140hp Volvo Penta, out for a spin around the lake....I let it warm up for a couple of minutes, took off and got to full throttle and everything was ok still.....i slowed down and all of a sudden, boom...white smoke billowed out from the engine compartment, it was still running but it was really loud...I killed the motor and coasted into the dock....opened up the engine cover and more smoke was billowing out, I noticed the engine was really hot for only running maybe 10 minutes or so, I also noticed that the exhaust hose had burst and I think that's where the smoke was coming from....The engine starts right up, no problem, but was really loud because of the hole in the exhaust hose....Is my problem only the exhaust hose that burst or could I also need a water pump cuz it was running hot...what would cause the hose to burst under pressure?? I am going to replace the hose today and see if its ok, but wasnt sure if something else could be wrong Any and all input would be helpful....HELP PLEASE!!!

 

[bruceb58]

Re: White smoke, exhaust hose busted, water pump??

The water flowing through your riser cools the exhaust gases and that rubber exhaust hose. Somehow, you lost that water supply.

You could have a blockage somewhere or a bad impeller. You could even have picked up a bag on your sterndrive temporarily which blocked water flow.

 

[shute421]

Re: White smoke, exhaust hose busted, water pump??

When I took off the hose, the pipe was full of water still....so I dont think that I lost the water supply...but I'm no expert....

 

[hullofalottatrouble]

Re: White smoke, exhaust hose busted, water pump??

did the engine actually overheat? you said it was hot but what was the temp?

 

[shute421]

Re: White smoke, exhaust hose busted, water pump??

No it did not overheat the needle was a little more than 1/2 way....remember it ran for not even 10 minutes...

 

[bruceb58]

Re: White smoke, exhaust hose busted, water pump??

Did it look like the hose melted or that it split?

 

[bruceb58]

Re: White smoke, exhaust hose busted, water pump??

At full throttle 10 minutes is plenty for an engine to overheat and if you have no water, the sender won't be able to detect the correct engine temp.

 

[shute421]

Re: White smoke, exhaust hose busted, water pump??

The hose was split, not melted and I was only at full throtte for about 3 minutes, I let it run for a couple of minutes when I first started it, took off and then got to full throttle for a couple of minutes and slowed down.

 

[shute421]

Re: White smoke, exhaust hose busted, water pump??

At full throttle 10 minutes is plenty for an engine to overheat and if you have no water, the sender won't be able to detect the correct engine temp.

So you dont think its the water pump?? the impeller, or some sort of blockage??

 

[shute421]

Re: White smoke, exhaust hose busted, water pump??

The water flowing through your riser cools the exhaust gases and that rubber exhaust hose. Somehow, you lost that water supply.

You could have a blockage somewhere or a bad impeller. You could even have picked up a bag on your sterndrive temporarily which blocked water flow.

Thinking about it, this could be it.....I'm not sure water was flwing thru.....after I replace that hose...how can i find out if thats what it is??

 

[bruceb58]

Re: White smoke, exhaust hose busted, water pump??

When was the last ime you replaced your impeller?

If it was my boat I would take the pump apart and take a look at it.

Is the boat used in salt water? If so, might be worthwhile taking off the riser to see if it is clogged.

After you start your boat again, take off the hose that leads to the manifold and see if there is a good flow of water. Obviously don't do this for long because you will have a burnt up exhaust hose again.

When you get it all put together. Pay close attention to the temp of the riser. You should be able to keep your hand on it.