spoilsofwar
Lieutenant Junior Grade
- Joined
- Jun 29, 2011
- Messages
- 1,124
Engine: 4.3 GL-P
Issue: I dropped the boat in the water for the first time this year. When I was running it in the driveway on the hose, I noticed the temp gauge creeping up higher then I've ever seen it (200+ indicated). I thought it was maybe due to low water flow from the hose (new house, weird low pressure thing on the hose tap). Today, on the lake, the same thing happened, so running on the hose was not the culprit.
I brought along my IR thermometer today to help troubleshoot. Although the gauge takes a long time to get into overheat range (30+ minutes) it will eventually creep to around 210F. However, all my IR sampling was displaying only around 180F max. The thermostat housing was generally showing 170F, and pointing the IR gun directly at where the temp sensor sits in the intake manifold topped out around 180F. I am thinking either my temp sender or my gauge have gone south on me.
I am fairly sure this is not an actual overheat condition. My IR gun reads temps true, as I've measure it against some known temperature items and its been accurate. As for the engine itself, it has a brand new water pump impeller and brand new thermostat. The manifolds, risers and rest of the exhaust is cool to the touch when the engine is up to temp. Since the gauge reads hot on the hose and in the lake I know its not an air leak in the water intake stream from the drive. Water pump isnt leaking. The boat has never overheated or ran hot before, and besides this its running excellent.
I plan on replacing the sender (part #21) to see if that rectifies the issue. However, I am wondering what exactly part #22 does? This is the sensor in the thermostat housing. If I disconnect the wire from it when the engine is running, no alarm sends. It doesn't send to a gauge, so what is its purpose?
Any ideas of what else could be responsible for this issue besides the sender or the gauge itself?
Issue: I dropped the boat in the water for the first time this year. When I was running it in the driveway on the hose, I noticed the temp gauge creeping up higher then I've ever seen it (200+ indicated). I thought it was maybe due to low water flow from the hose (new house, weird low pressure thing on the hose tap). Today, on the lake, the same thing happened, so running on the hose was not the culprit.
I brought along my IR thermometer today to help troubleshoot. Although the gauge takes a long time to get into overheat range (30+ minutes) it will eventually creep to around 210F. However, all my IR sampling was displaying only around 180F max. The thermostat housing was generally showing 170F, and pointing the IR gun directly at where the temp sensor sits in the intake manifold topped out around 180F. I am thinking either my temp sender or my gauge have gone south on me.
I am fairly sure this is not an actual overheat condition. My IR gun reads temps true, as I've measure it against some known temperature items and its been accurate. As for the engine itself, it has a brand new water pump impeller and brand new thermostat. The manifolds, risers and rest of the exhaust is cool to the touch when the engine is up to temp. Since the gauge reads hot on the hose and in the lake I know its not an air leak in the water intake stream from the drive. Water pump isnt leaking. The boat has never overheated or ran hot before, and besides this its running excellent.
I plan on replacing the sender (part #21) to see if that rectifies the issue. However, I am wondering what exactly part #22 does? This is the sensor in the thermostat housing. If I disconnect the wire from it when the engine is running, no alarm sends. It doesn't send to a gauge, so what is its purpose?
Any ideas of what else could be responsible for this issue besides the sender or the gauge itself?
