Hey all,
I'm looking for some help with an overheating problem. I have a 5.0GXI-G in a 2007 Glastron 259 GS.
A few weeks ago, my temperature gauge alarm went off while I was out on the water and I opened up the engine compartment and found that pretty much everything was very hot to the touch. So I shut everything down and got towed back in.
Since then, in an effort to troubleshoot the over heating, I've checked all the hoses, replaced the water pump (even though the old one seemed to be working fine) and then replaced the risers and manifolds. I just bought the boat this year so I don't know when the last time the risers / manifolds were changed but it looks like they were pretty old. They were blocked up pretty good.
Now that I've done all of that, the engine temp seems to be running perfectly. I have an IR temp gun and have temped pretty much everything in the compartment. The boat seems to be running really well, but when it idles, or I'm cruising very slowly in a no wake zone, the starboard riser temperature shoots up. Then when I give it gas and get up on plane, it cools back down again. Then I back down the throttle and it heats right back up again. At idle, it gets as high as like 195 degrees. On plane it comes down to between 120 and 130. It's always hotter at the base of it where it meets the manifold and the manifold itself is usually around 20-30 degrees cooler directly below where it meets the riser. And the outside of the manifold where the water comes in stays consistently around 110 no matter how many RPMs I'm at. So it certainly seems like water is coming in, but then I have no idea what's happening. I've started the boat with the hoses from the thermostat housing to the manifolds disconnected and there seems to be plenty of water flowing.
I know that one side will generally run a little hotter than the other but this is different. The port riser seems to be working fine. Sits between 110 and 135 depending on the RPMs.
However, that's not always terribly consistent. That's how it is most of the time but today I started the boat at the dock and within 10 minutes or so, the port riser was at about 165 and the starboard riser was around 180. Then I revved the engine to about 1500 rpms and they both cooled down to around 130. Then when I backed it down to idle, the port riser stayed cool (around 120) but the starboard one started to climb again and within a few minutes it was up over 165 again. But interestingly, the temp of the exhaust elbows that connect to the back of the risers always seem to stay constant at around 115-120.
I'm running out of ideas here. Any help would be greatly appreciated.
Thanks a lot.
I'm looking for some help with an overheating problem. I have a 5.0GXI-G in a 2007 Glastron 259 GS.
A few weeks ago, my temperature gauge alarm went off while I was out on the water and I opened up the engine compartment and found that pretty much everything was very hot to the touch. So I shut everything down and got towed back in.
Since then, in an effort to troubleshoot the over heating, I've checked all the hoses, replaced the water pump (even though the old one seemed to be working fine) and then replaced the risers and manifolds. I just bought the boat this year so I don't know when the last time the risers / manifolds were changed but it looks like they were pretty old. They were blocked up pretty good.
Now that I've done all of that, the engine temp seems to be running perfectly. I have an IR temp gun and have temped pretty much everything in the compartment. The boat seems to be running really well, but when it idles, or I'm cruising very slowly in a no wake zone, the starboard riser temperature shoots up. Then when I give it gas and get up on plane, it cools back down again. Then I back down the throttle and it heats right back up again. At idle, it gets as high as like 195 degrees. On plane it comes down to between 120 and 130. It's always hotter at the base of it where it meets the manifold and the manifold itself is usually around 20-30 degrees cooler directly below where it meets the riser. And the outside of the manifold where the water comes in stays consistently around 110 no matter how many RPMs I'm at. So it certainly seems like water is coming in, but then I have no idea what's happening. I've started the boat with the hoses from the thermostat housing to the manifolds disconnected and there seems to be plenty of water flowing.
I know that one side will generally run a little hotter than the other but this is different. The port riser seems to be working fine. Sits between 110 and 135 depending on the RPMs.
However, that's not always terribly consistent. That's how it is most of the time but today I started the boat at the dock and within 10 minutes or so, the port riser was at about 165 and the starboard riser was around 180. Then I revved the engine to about 1500 rpms and they both cooled down to around 130. Then when I backed it down to idle, the port riser stayed cool (around 120) but the starboard one started to climb again and within a few minutes it was up over 165 again. But interestingly, the temp of the exhaust elbows that connect to the back of the risers always seem to stay constant at around 115-120.
I'm running out of ideas here. Any help would be greatly appreciated.
Thanks a lot.