Assume you mean the boat just keeps turning.
Don't know what kind of motor
unit you have...mine was an electric
chain-drive model which had a serious design flaw. There was a polished stainless steel
shaft, about the thickness of your little finger, which rotated.
A nylon gear
was slipped over this s/s shaft, and when the shaft rotated the nylon gear
turned with it and, in turn, engaged a tiny little gear and motor
. Actually, the motor was a generator
, part of the rudder
position system which supplied voltage to the "brain" so it would know about rudder
The problem with this brilliantly engineered gear was that the nylon gear was FRICTION FIT onto the s/s shaft. Of course, over the years with normal wear, temperature variations, and a bit of oil
or moisture the damned thing would slip. This would cause the boat to violently change course...it tried to kill me a number of times before I found this problem and fixed it by drilling a hole thru the hub on the nylon gear and tapping in a screw to a dimple I put in the s/s shaft. That fixed THIS problem, but there were lots of others over the years.
Glad it's gone.
Don't give up hope of replacing the thing sometime. I was talking to a guy yesterday who bought a complete new autopilot
system, including hydraulic ram, and all the parts
, from Boat U.S. for $100 in a surplus sale