Good Trout To You Sir
Petty Officer 3rd Class
- Joined
- May 22, 2018
- Messages
- 85
Motor: 1987 Evinrude 2.5HP (E3RCUA). Model design lacks thermostat. Tell-tale in form of spray generated through 8 small holes on midsection (4&4).
History: Motor abused by previous owner. Plastic wire insulation showed signs of heat stress (melt) when I acquired motor. Since my rehab with new fuel pump, carb clean, new water pump assembly, I have 80+ hours on motor. Generally runs well, though I have lower unit bearings, seal issues to address.
Symptoms: Motor possibly overheating when throttle advanced past 1/3 speed. Because of water churn, nearly impossible to observe tell-tale spray under operating conditions. Spray is visible when running in test tank. Underside of midsection flange - where bolts to block - strikes me as hotter than acceptable when running 1/3 speed or higher. Too hot to maintain hand contact. When motor slows to 1/3 throttle or less, this same location cools very quickly......within 10-15 seconds it's no more than slightly warm.
Cowling is a dreadful design. Not at all easy to remove. Impractical to run motor without cowling on the water. With no thermostat in design, no way to observe tell-tale spray on the water and no temp gun in my tool kit, what is litmus test for yes/no on overheating and the pathway for troubleshooting assuming impeller is not at fault?
History: Motor abused by previous owner. Plastic wire insulation showed signs of heat stress (melt) when I acquired motor. Since my rehab with new fuel pump, carb clean, new water pump assembly, I have 80+ hours on motor. Generally runs well, though I have lower unit bearings, seal issues to address.
Symptoms: Motor possibly overheating when throttle advanced past 1/3 speed. Because of water churn, nearly impossible to observe tell-tale spray under operating conditions. Spray is visible when running in test tank. Underside of midsection flange - where bolts to block - strikes me as hotter than acceptable when running 1/3 speed or higher. Too hot to maintain hand contact. When motor slows to 1/3 throttle or less, this same location cools very quickly......within 10-15 seconds it's no more than slightly warm.
Cowling is a dreadful design. Not at all easy to remove. Impractical to run motor without cowling on the water. With no thermostat in design, no way to observe tell-tale spray on the water and no temp gun in my tool kit, what is litmus test for yes/no on overheating and the pathway for troubleshooting assuming impeller is not at fault?