Running Hot While @ Idle Speed

[Regal-89]

On my last run for the season, I was going through a no-wake zone for about 1/4 of mile. The boat started to over heat towards the end. Is there anything in particular thing that would cause this? It's a Mercruise/I/O 3.7 Alpha One 1989. The boat was running fine, while pulling the kids on the tube, but once we were just cruising I noticed the motor was spitting out antifreeze after going through the 1/4 mile no-wake zone. Any suggestions would help.

 

[tommays]

Re: Running Hot While @ Idle Speed

shane<br />the best first guess is the condition of the raw water pump when the inpeller gets old they dont pump well at low speeds<br /><br /><br />tommays

 

[Regal-89]

Re: Running Hot While @ Idle Speed

just for the sake of this conversation.....let's say that's the problem. How much work, plus cost is it to replace that water pump?

 

[tommays]

Re: Running Hot While @ Idle Speed

http://www.mercstuff.com/waterpumpinst.htm <br /><br /><br />this will give you and idea whats involved the hard part is allways what does not want to come apart with out breaking<br /><br />tommays