2000 four winns overheated

[spdrcr7882]

I have a 2000 four winns 230 horizon and I had about 10 people on it the other day and we were racing back to shore to make it before sundown. we were at full throttle and the engine began to over heat. We shut it down and checked for clogging on the outdrive where it sucks the water in and it was clean. Then we started it up and drove back at half speed and it didn't over heat again. When I got home I got one of those clamps that pumps water to the outdrive so you can run the engine out of water and ran it for about 10 minutes and I had no heat issues. What could have caused this and any suggestions for a solution would help. I think that maybe becuase we had such a large load on the boat and we were running WOT that it over heated, but i would think that with cool lake water being pumped into the engine that this wouldn't be an issue. I believe that the boat has the 5.7 liter engine.
Justin

 

[Bondo]

Re: 2000 four winns overheated

How long has it been since the Impeller has been Changed,..??..??.....

 

[HT32BSX115]

Re: 2000 four winns overheated

Or has it EVER been changed? Also if it was changed sometime in the past....was the old one disintegrated and did the "changer" go looking for the pump remnants that were deposited downstream?

How long has it been since the Impeller has been Changed,..??..??.....

 

[spdrcr7882]

Re: 2000 four winns overheated

Is the impellar in the outdrive? I was told by someone else that this model engine does not have an impellar in the outdrive? And if so how is it checked?
Justin

 

[Don S]

Re: 2000 four winns overheated

Is the impellar in the outdrive? I was told by someone else that this model engine does not have an impellar in the outdrive? And if so how is it checked?
Justin

What engine and outdrive do you have? In this forum, it doesn't matter what boat it is, engine and drive is what counts.

 

[Bondo]

Re: 2000 four winns overheated

I was told by someone else that this model engine does not have an impellar in the outdrive? And if so how is it checked?

All engine/ drives have an Impeller Somewhere,.....

If you don't tell Us what you've Got,.....
We can't tell you Where to Look.......
And,.......
Impellers are Changed,.... Not just Checked........

 

[mikeneal]

Re: 2000 four winns overheated

Is boat used in salt water? How old are the manifold& risers? A partly clogged riser will show up under those conditions. If it is salt water boat and manifolds and risers are original change them, they are due anyhow.

 

[spdrcr7882]

Re: 2000 four winns overheated

The engine is a 5.7 volvo penta GSI, it has the duo prop outdrive. It is only used in fresh water.
Justin

 

[Don S]

Re: 2000 four winns overheated

Your manifolds are probably fine since you are in fresh water, but the raw water pump impeller should be changed every other year to prevent overheat problems.
The pump is located on the front of the crankshaft. Replace the housing oring also, not just the impeller.

 

[spdrcr7882]

Re: 2000 four winns overheated

So, is that the only pump to look at? I have worked on several car engines before where the water pump is on the front of the engine, and appears to be powered by the belt system. I let the engine idle in the lake the other day and took one of the larger hoses off for a second and there was a lot of water flowing through it, so I am under the impression that the pump is flowing correctly. But i could be wrong.
Justin

 

[mcbridek]

Re: 2000 four winns overheated

Technically there are two pumps, one draws lake water up through the stern drive and has a rubber impeller (which is most likely your problem) and a second engine water pump (similar to a car engine pump). I have a 2000 5.0 engine, not sure is the impeller is in a different location on the 5.7, I have changed the impeller on a number of different boats and it is not difficult if you can find a good thread specific to your engine.

 

[spdrcr7882]

Re: 2000 four winns overheated

I took the water pump off the buttom of the engine and pulled the rubber impellar out, see attached picture. It doesn't look damaged or worn, but I have never looked at one of these before so I may be wrong. What else could be causing the boat to over heat if this impellar isn't the problem?
Justin

 

[Maclin]

Re: 2000 four winns overheated

That impeller looks worn to me. The fins should work their way back to straight out once it has been out of the housing for a bit. The fins that are staying "set" will not reach out and fill the void like they should inside the housing and the pump action will not be as efficient. I would also bet that if you look at each and every valley and work the fins back and forth you willl find cracks.

Get a new one from Volvo and you will see what I mean. Grease the new one with synthetic grease before you install it, also rub the grease around the inside of the housing. BE SURE it is synthetic grease, petroleum based stuff will wear down rubber eventually.

 

[Don S]

Re: 2000 four winns overheated

I took the water pump off the buttom of the engine and pulled the rubber impellar out, see attached picture. It doesn't look damaged or worn, but I have never looked at one of these before so I may be wrong. What else could be causing the boat to over heat if this impellar isn't the problem?
Justin

The fact that the vanes didn't straighten out means it needs to be replaced, it may be enough to cause an overheat on a 23' boat with 10 people and their stuff on board going at WOT.

 

[Bondo]

Re: 2000 four winns overheated

Ayuh,..........

That looks pretty Wooped to Me..........................

Atleast All the impeller is there,......
You won't have to go lookin' for the Broken Vanes that'll cause All sorts of Problems.......