Reply to thread

Message

<blockquote data-quote="sl1000794" data-source="post: 50502" data-attributes="member: 6974"><p>From what I remember when I took a years worth of Outboard Engine Mechanics almost 40 years ago was that water pumps were designed to pump almost 3x as much water as was needed to cool the engine.&nbsp; The reason was to cover owners that would just &quot;slightly&quot; start the engine dry to make sure that it would start.&nbsp; As a result the water pump wouldn't perform up to spec but would still push sufficient water to cool the engine.&nbsp; When the water pump works to spec the volume of water thru the engine needs to be regulated to allow the engine temp to rise to it's design temp and allow it to run at optimum performance.&nbsp; The thermostat does that by monitering engine temps.&nbsp; A thermostat stuck open would make the engine run rich (choked and inefficient) and a thermostat stuck partially closed would/could make an engine run hot.&nbsp; I think (???) that overheated (aluminum) outboard engine blocks just expand (thus shrinking the cylinder bore) and seizing the piston and stopping the engine until it has had a chance to cool and return to the designed bore.&nbsp; I don't think that this happening once will do serious engine damage.&nbsp; Just get the problem fixed … water pump or thermostat repair.</p></blockquote><p></p>

[QUOTE="sl1000794, post: 50502, member: 6974"] From what I remember when I took a years worth of Outboard Engine Mechanics almost 40 years ago was that water pumps were designed to pump almost 3x as much water as was needed to cool the engine. The reason was to cover owners that would just "slightly" start the engine dry to make sure that it would start. As a result the water pump wouldn't perform up to spec but would still push sufficient water to cool the engine. When the water pump works to spec the volume of water thru the engine needs to be regulated to allow the engine temp to rise to it's design temp and allow it to run at optimum performance. The thermostat does that by monitering engine temps. A thermostat stuck open would make the engine run rich (choked and inefficient) and a thermostat stuck partially closed would/could make an engine run hot. I think (???) that overheated (aluminum) outboard engine blocks just expand (thus shrinking the cylinder bore) and seizing the piston and stopping the engine until it has had a chance to cool and return to the designed bore. I don't think that this happening once will do serious engine damage. Just get the problem fixed … water pump or thermostat repair. [/QUOTE]

Verification

What is the most common fish caught on this site?

Reply to thread

Recent Posts

Friends of NDA