I have a 1995 Crestliner 1750 Sportfish, VP 3.0 with the SX-SLT outdrive. I wanted to try another pitch prop on it. It had an alum Michigan wheel 15 dia 17 pitch when I bought it. Ran fine with it and felt like I was topping out at 4000 rpm. Trying to put a 4 blade alum Solas prop 14.75 dia and 21 pitch. Trying to get a little more speed out of it. Ran fine for the first 20 mins and we did a couple wot runs at 3800 rpm, then did a little more half throttle runs so the kids could drive the boat. After another 20-30 mins it started to smell hot and was smoking. Shut it down and left cover open to cool off. After I got home, I pulled water pump on engine and inspected impeller, everything was good. Used hose to back flush raw water hose from the lower unit. Looked good and a strong flow of water. Hooked up the muffs and ran it off the hose and checked a few other spots for flow. Nothing seemed to be lacking in flow. I looked at thermostat, didn’t seem bad but I am too impatient to test. After idling on the hose for 20 mins, I opened the block drain and the water coming out of there was very hot and a strong stream. I am sorry for the long winded ask, but trying to give all the back story on it to help get answers. I changed the oil this spring and it was recommended to use 30w synthetic, I don’t know what was used before me. I used 10w-30 full synthetic mobil one. Could it be the oil viscosity? The new prop straining the engine? Something? Any ideas or suggestions would be great. Thank you.
