Mercruiser 170hp 470 3.7 impeller issue

[southwest395]

Re: Mercruiser 170hp 470 3.7 impeller issue

Flushed cooling system. Pulled outdrive off and the impeller and the plastic tube were melted and missing fins. Dont know how that happened i changed it all this year when i bought the boat.

 

[southwest395]

Re: Mercruiser 170hp 470 3.7 impeller issue

any idea what would cause that to melt ?

 

[southwest395]

Re: Mercruiser 170hp 470 3.7 impeller issue

Iam replacing now: New impeller and housing and water pocket seal, exhaust boot on inside and water flap were all melted and burned.

 

[southwest395]

Re: Mercruiser 170hp 470 3.7 impeller issue

It actually melted some of the fins to the top of the metal ring inside the housing.

 

[southwest395]

Re: Mercruiser 170hp 470 3.7 impeller issue

what would cause the water flap to melt ?

 

[ktbarrentine]

Re: Mercruiser 170hp 470 3.7 impeller issue

hmmm..let's see..... how about lack of water? (and lots of friction)....Friction, combined with waterless exhaust temps in that area.