help overheating?

[mac28]

What could be causing the overheating on an 89' Johnson 175 outboard? I'm thinking the impellor. Thanks.

[Tom Brown]

impellor

[Forkin' Crazy]

What is happening? Alarm going off? Impeller or thermostats or an obstruction.

[Towndrunk]

Do you have a temp gauge or are you taking the alarms word for it. Older OMC's were bad about shorts to the horn. If no gauge check the horns wiring for a short. If so then disregard my opinion.
TD

[riverbound]

I have no idea

[mac28]

Thanks, it is a boat that I am thinking about buying. Owner said last time out it was overheating. I was thinking a H2O pump impeller. I can get a good deal on the boat. I just want to make sure it is not going to be a major fix. Thanks for the wisdom.

[Towndrunk]

Most times on an outboard it is the impeller. Take a compression test on it at the very least. The cyls need to be no more than 15 percent of each other.

[mac28]

Thanks drunk.