Issue is on a 1994 2 barrel 4.3L.
I was out on the water last weekend and on the way back in decided to troll an umbrella rig just for kicks. After about 5 minutes at 2.8-3 mph and engine just off idle, I noticed the temp gauge was creeping toward the hot end, about 3/4 up the gauge. Pushing in the shift bypass knob and running the RPM's up slightly dropped the temp back to normal range within a minute or so. I just replaced the thermostat with a new 140 temp version this season, temp gauge usually sits between 1/4 and 1/2 during normal operation. Impeller was new last season. I have noticed the engine has the same tendency to run hotter than normal at idle on the muffs as well, but I thought that was just due to the last of good flow on the hose compared to being submerged in the water.
Is that normal operation at low RPM? Am I trying to troll to slow at low engine speeds? The only other I can do is get some trolling bags to slow me down and run at a higher RPM, or maybe re-prop?
I was out on the water last weekend and on the way back in decided to troll an umbrella rig just for kicks. After about 5 minutes at 2.8-3 mph and engine just off idle, I noticed the temp gauge was creeping toward the hot end, about 3/4 up the gauge. Pushing in the shift bypass knob and running the RPM's up slightly dropped the temp back to normal range within a minute or so. I just replaced the thermostat with a new 140 temp version this season, temp gauge usually sits between 1/4 and 1/2 during normal operation. Impeller was new last season. I have noticed the engine has the same tendency to run hotter than normal at idle on the muffs as well, but I thought that was just due to the last of good flow on the hose compared to being submerged in the water.
Is that normal operation at low RPM? Am I trying to troll to slow at low engine speeds? The only other I can do is get some trolling bags to slow me down and run at a higher RPM, or maybe re-prop?