Mercrcruiser 5.0 Alpha One running hot

[wthumbert@comcast.net]

I have a SeaRay 230 sundancer with a 5.0 alpha one mercruiser. It's running hot at WOT (approx. 4200 rpm) it will spike up to 220 ferenheit and the temp alarm goes off. When I back it down to 3000 rpm the temp gauge reads in the green zone and the alarm goes off. I just had a series of repairs done to it (including replacing the impeller) what could be causing this and is this a DIY job or do I need to wait for 3weeks to have a certified marine mechanic finally get around to it.
p.s. it never did this before the repair work!
I'd greatly appreciate any advice

 

[Haut Medoc]

Re: Mercrcruiser 5.0 Alpha One running hot

Welcome to iboats.....
What year?.....
It didn't do it before?.....
I'd take it back & demand that they make it a priority......
You may be able to fix it yourself.....​

 

[WAVENBYE2]

Re: Mercrcruiser 5.0 Alpha One running hot

Welcome to iboats.....
What year?.....
It didn't do it before?.....
I'd take it back & demand that they make it a priority......
You may be able to fix it yourself.....​

I definitly would be sitting and waiting on them to fix right then and there..