Home › Forum › Ask A Member › 9.9/15 hot spots › Re: 9.9/15 hot spots
Follow up on this thread…call out to all the experienced veteran mechanics/service techs on our forums. I have a 9.5 (NINE POINT FIVE) which I changed out the thermostat, new impeller, and pulled the cylinder head and observed no clogs along with moisture around the water jacket in both the cylinders and head, yet I found with the laser thermometer that it was running between 158-166 right next to the plugs. At throttle, it was hitting near 190-200°, but the bypass temperature (up to the new thermostat) was staying within operating range. I figured at the plugs all motors run well above the recommended temperature, but wanted to cover that base as a responsible aspiring OMC mechanic/business owner.
Maybe I’m splitting hairs (because I want to make sure when I sell something it is right), but wanted to see if this is, from an experience standpoint for all you veterans, something you have all seen? This is probably the first 9.5 that I’ve worked on in about 3 months and all the others I used a thermomelt stick on the top of the cylinder, around the thermostat housing, and to the starboard side of the top cylinder head. It’s finally boating season here in NH, and the 9.5’s are simply put, hotcakes.
Just goes to show how using a laser thermometer yields a lot more info, and how I need to continue to accrue real-life experience (nothing in this thread really has spoken about any literature that would talk about the things I’ve asked about, or referenced and literature which ‘experencially’ speaks to this particular topic).
There is no discoloration around the plugs or flaking paint, and it is pumping plenty of water (both with the original impeller and OEM impeller I installed today). I can post some pics if anyone needs them.