Mercursier 5.0 t-state and water replacement.

[Zorm]

1st time posting here. Just like subject says. Got a 2007 SeaRay 205 sport. We bought it with 4 hrs on the meter, its got 224 now. I did get the 100 hr service done but nothing since then, just oil changes. Today, she overheated. by the time we got back to the dock, I saw the temp suddenly drop to 170, so maybe it was a stuck t-stat. So I get her home, take off the t-stat housing and find black crud and flakes in the housing. I finally got the t-stat out and found it loaded up with gunk.

So, I'm thinking, since I'm here, lets change out the water pump, question I have is, is there any way or stuff to flush out my engine of the crud? Like something I can make up to make it a closed system, toss some descale in the cooling system and run it for a bit? I really don't want this crud in there with new parts.

thanks for any help

 

[Scott Danforth]

Change your impeller....flush the system to find the parts from the failed impeller

 

[tpenfield]

Since the exhaust manifold and elbows need a constant flow of water to cool the exhaust, it would be difficult to set the engine up as a recirculating cooling flow.

Try the back flushing that Scott recommended.

Are you fresh or salt water?

 

[Bondo]

and find black crud and flakes in the housing.

Ayuh,.... The black bits are probably pieces of the raw water impeller,....

 

[Zorm]

Ok, check/look/replace impeller. I'm fresh and salt water, more brackish. Gulf Coast but like to play around the inlets where the rivers come out. Not a big fan of salt water.

 

[Zorm]

Here is the t-stat. Ok, so when i go to order this, is 160* normal for a 07 Mercrusier 5.0? water pump for the same?

 

[porscheguy]

160 is the normal t-stat. Yours has definitely seen better days and I think your running more towards salt than brackish.