Hildebrand
Petty Officer 2nd Class
- Joined
- Mar 29, 2016
- Messages
- 129
Well here’s another omc cobra possibly getting hot . I have posted about this before and thought I was in the clear. 1990 Four Winns Sundowner 225, with a 5.8 omc. My temp gauge is really hard to read, it says 100, has a line , 150 , has a line , and 240. At idle at the dock the boat starts fine and heats up to just over the 150 mark, so I’m guessing 160. With a Ir temp gun, the manifolds read about 110 or so. Now, if I pull the raw water hose at the dock I get a good flow out of the supply line, it’s not feet of water coming out of it but it’s a good push of water. Running the boat on plan the temp gauge moves up a touch but nothing crazy and pretty much stays at that mark until I come off plane and lose all that flow and it goes up to the line between 150 and 240 so my guess is 190 ish. After a few minutes of idling it drops right back down just back over 150. Right after a long plane out and ride I checked with my ir temp gun and my manifolds /risers are about 150-158 or so. This is what is kinda of confusing to me. The starboard side valve cover reads like 190 after that plane out and drive and the passenger side is cooler , like 175-180. Is that normal for the valve cover to be hot like that ? Is that heat coming from the manifolds pushing on to them ? No where on the block anywhere is even close to the 190 temp besides that.
Things i I have done. I have changed the impeller, and I have pulled it back off to check after all this and it looks good ,no groves or missing parts. I have ran my hose through each manifold and I do have water exiting the exhaust bellow. I have ran my hose through the raw water line and water has come out where the impeller sits , also have put a crappy pair of muffs that don’t seal and water has come up the drive and water exits where the impeller should me.
Motor starts and runs perfect, oil is not milky or level doesn’t change. Doesn’t use a drop of oil. I have also installed a brand new thermostat. The lower half of the drove was replaced just over a year ago and the boat doesn’t stay in the water.
My exhaust bellow is ripped pretty bad and I can look up to where the two mainfold pipes come to one and see no flappers or anything in there, look clean. My circulation pump does not leak or make noise so I think that’s fine. Both the belts are brand new so there’s no slipping so water should be moved pretty good.
This is has been going on and off for about a year now and I don’t know if I’m good or I need to find out what’s wrong. The exhaust riser rubber couplings aren’t burnt or anything and they look in good shape.
I did notice some burnt/ orange looking color on my manifolds but I’m not sure if that’s been there or not.
Are these numbers normal? Is that flow at idle sound about right ? Ive read just about every post on this form about omc and getting hot. Once I reinstalled the impeller I used bellows adhesive around the o ring and look like I have a good seal. The wear plate doesn’t really look bad either but I didnt replace it.
Things i I have done. I have changed the impeller, and I have pulled it back off to check after all this and it looks good ,no groves or missing parts. I have ran my hose through each manifold and I do have water exiting the exhaust bellow. I have ran my hose through the raw water line and water has come out where the impeller sits , also have put a crappy pair of muffs that don’t seal and water has come up the drive and water exits where the impeller should me.
Motor starts and runs perfect, oil is not milky or level doesn’t change. Doesn’t use a drop of oil. I have also installed a brand new thermostat. The lower half of the drove was replaced just over a year ago and the boat doesn’t stay in the water.
My exhaust bellow is ripped pretty bad and I can look up to where the two mainfold pipes come to one and see no flappers or anything in there, look clean. My circulation pump does not leak or make noise so I think that’s fine. Both the belts are brand new so there’s no slipping so water should be moved pretty good.
This is has been going on and off for about a year now and I don’t know if I’m good or I need to find out what’s wrong. The exhaust riser rubber couplings aren’t burnt or anything and they look in good shape.
I did notice some burnt/ orange looking color on my manifolds but I’m not sure if that’s been there or not.
Are these numbers normal? Is that flow at idle sound about right ? Ive read just about every post on this form about omc and getting hot. Once I reinstalled the impeller I used bellows adhesive around the o ring and look like I have a good seal. The wear plate doesn’t really look bad either but I didnt replace it.
