I have a 1986 Mercruiser 230 hp 305 GM and the first time I put it into the water this year It is heating up while at idle at 1000RPM and above it works fine but at idle it slowly gets hot. I pulled it out and split the case on the lower unit this morning. The impeller looks fine so I tore apart he thermostat housing and pulled out the thermostat. I plan on replacing both the thermostat and impeller since there out but I was hoping to see that maybe the impeller was shot but it looks normal. Anybody have any ideas of what else it could be if not these items. This is a new out drive last summer from sei that ran great last year for about 90 hours.
Thanks.
Dan
Thanks.
Dan
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