bob johnson
Rear Admiral
- Joined
- Feb 25, 2009
- Messages
- 4,306
sunday I was running my boat across the river at 3/4 throttle when the alarm went off...luckily I looked down at the gauges and could see one head was 220 degrees and the other was 180 degrees!!!!. For the last few years the alarm goes off when nothing is wrong and I tend to ignore it.... one head will tend to run to about 180 at times when idling...but never at speed.... once the thermostat comes off its seat the motor stays cool...usually about 100- 120 degrees! I don't know if it was a coincidence that the alarm went off when the motor just happened to be at 220 degrees.....or the temp triggered it....but the motor did NOT go into slow mode.... I was running about 4000 rpms at the time... I shut her down, and figured I knew what the problem was. sure enough I had a clump of water chestnut vegetation stuck on the front side of the lower unit...creating a vaccum spot, so the motor wasn't picking up sufficient water... I cleared the weeds and started the motor back up and took her up to 4000rpm and she cooled right back down to 100 degrees.... my question is...should the SLOW have kicked in.. and if so.... since it didn't, what should I be looking at to make sure my SLOW mode is working. thanks..bob