Home › Forum › Ask A Member › AD-12 overheating – new impeller too!! › Re: AD-12 overheating – new impeller too!!
I don’t agree with the splashing water on the powerhead approach.
Spend $10 and buy a laser thermometer. Completely eliminates all guesswork and you’ll ask yourself why you didn’t do it sooner.
The cylinder head will always read very hot. This is not where you should be measuring temperature. Keep in mind that the cooling/water jacket can only supply so much water to a cylinder head, which is really just a heat sync.
With that motor, it is normal to see the exhaust bypass cover get above 143°, even 180°. With almost all of those motors I’ve seen, they are usually burnt paint. What you care about is the cylinders themselves. The exhaust cover is just taking a constant wall of flame even with a brand new motor. Take a look at a 3hp JW and it’s like death and taxes, constant burnt exhaust bypass covers!
Before you go through the hassle of pulling the powerhead AGAIN, follow the other recommendations which all have merit. Chiefly, fill that barrel up more and get a laser thermometer. It’s good to be paranoid about overheating!