JimG
04-11-2003, 08:44 PM
I haven't posted this question, becuase I wanted to put a new sender in, but it did not help...
My water temp barely shows 120 degrees, no matter how I'm running. I've checked the gounds, cleaned the contact surfaces of the old sender, put in a new sender... all to no avail! I ran the boat on the hose this evening for 20 minutes, then backed the sender out to feel the water behind the thermostat. It wasn't very hot, probably 110 degrees or so.
It's a H/M 351W, raw water cooled with a crank mounted Johnson pump dumping straight into a H/M y-pipe where the circ pump would go in a car. I put in a new thermostat, but could the pump pressure be pushing it open against the spring? Once, when it was ice-cold I cracked one of the hoses that run from the thermostat housing to the exhaust manifold. LOTS of water moving there. Shouldn't the thermostat have slowed it down some?
BTW: the boat runs great! No outward problems, good throttle response, no oil consumption, idles very good at 500 rpm. It just bugs me to see the temp so low!
Thanks for your help!
JimG
<small>[ April 12, 2003, 06:04 AM: Message edited by: JimG ]</small>
My water temp barely shows 120 degrees, no matter how I'm running. I've checked the gounds, cleaned the contact surfaces of the old sender, put in a new sender... all to no avail! I ran the boat on the hose this evening for 20 minutes, then backed the sender out to feel the water behind the thermostat. It wasn't very hot, probably 110 degrees or so.
It's a H/M 351W, raw water cooled with a crank mounted Johnson pump dumping straight into a H/M y-pipe where the circ pump would go in a car. I put in a new thermostat, but could the pump pressure be pushing it open against the spring? Once, when it was ice-cold I cracked one of the hoses that run from the thermostat housing to the exhaust manifold. LOTS of water moving there. Shouldn't the thermostat have slowed it down some?
BTW: the boat runs great! No outward problems, good throttle response, no oil consumption, idles very good at 500 rpm. It just bugs me to see the temp so low!
Thanks for your help!
JimG
<small>[ April 12, 2003, 06:04 AM: Message edited by: JimG ]</small>