Anthony (M5 in Calgary)
06-28-2005, 10:22 AM
I have a 22 year old Evinrude 90HP V4 engine and had a couple of overheat warning horn incidents.
I took off the cylinder head covers to inspect the temperature sensors (bi-metal snap switches) and have determined they are turning on ~25 degrees colder than they should (180F, s/b 205F) so there's no actual overheat problem, just faulty switches. I'll be putting in new switches.
This engine has an accessory temperature gauge sender fitted to one of the cylinder heads but it is mounted on a bracket and presses on the cylinder head cover rather than threading into a hole allowing the tip to be exposed to the flowing water. While I have the covers off it would be a simple matter to drill a hole and tap for the sensor since I can see where I have clearance within the head casting. I want to run a sensor in each head and use a switch on the dash to monitor one head or the other for peace of mind.
Am I overthinking this?
I took off the cylinder head covers to inspect the temperature sensors (bi-metal snap switches) and have determined they are turning on ~25 degrees colder than they should (180F, s/b 205F) so there's no actual overheat problem, just faulty switches. I'll be putting in new switches.
This engine has an accessory temperature gauge sender fitted to one of the cylinder heads but it is mounted on a bracket and presses on the cylinder head cover rather than threading into a hole allowing the tip to be exposed to the flowing water. While I have the covers off it would be a simple matter to drill a hole and tap for the sensor since I can see where I have clearance within the head casting. I want to run a sensor in each head and use a switch on the dash to monitor one head or the other for peace of mind.
Am I overthinking this?