|Topic Review (Newest First)|
|05-20-2008 04:57 PM|
|sendrom||Perhaps you have a problem with the shaft alignment? Even if you ran the engine at the dock on forward I don't think you did it in full power did you? In which case it would overheat only on water when in cruise speeds...|
|05-08-2008 09:50 PM|
Originally Posted by T37Chef View Post
|05-08-2008 09:13 PM|
All the previous suggestions sound right on. Last year I was having hot engine issues, did everything suggested, plus flushed the fresh water cooling system, replaced thermostat, impeller, & several hoses. Then ran a product called Barnacle Buster Concentrate from Trac Ecological through the system. I let it sit overnight and flushed it out, no more worries. I plan to do this probably every other year now.
TRAC Ecological Marine Products
|05-08-2008 03:27 PM|
Here's a good photo I just yoinked from Google Images, but I'm guessing it's from a power boat. (look at all that space!)
|05-08-2008 03:24 PM|
Have you checked the water strainer? I had the same identical situation, and it ended up being that the water strainer was clogged with algae... (Thanks again David)... it could actually be that simple.
Most water strainer at least for diesels - are very small and under sized resulting the symptoms occurring more heavily. The reason why it is not happening at the dock is that you are not putting any load on the engine and therefore it draws less water...When motoring it draws more and the water strainer when clogged will more readily restrict the flow that is required.... so it may not be the heat exchanger after-all....(I am assuming this was something not looked at)....
|05-08-2008 03:17 PM|
To elaborate for you, beej67, I don't understand why it didn't heat up at the dock. I can only think of two reasons: 1. obstruction or 2. it wasn't loaded up as much as I thought it was. (No tach to verify.) Both have already been mentioned here.
The thorough cleaning is an attempt to get the boat back up to shape. I bought it used recently and it has sat for 4+ years. It was an accomplishment just breaking it loose and sailing.
I'm interested in that flush that Freesail mentioned. I've heard of Barnacle Buster and Salt Away but haven't heard if either work any better or worse than a weak acid solution.
Also (maybe this needs to be another post) there is no raw water screen between the thru hull and raw water impeller. Shouldn't there be one to catch debris coming in? Thanks for all the help!
|05-08-2008 12:54 PM|
|Freesail99||The transmission on the Volvo will cause over heating problems, it happened to me. There is a product that can be used to flush your system and remove any obstructions. I can't find the link but I will post it as soon as I do.|
|05-08-2008 12:17 PM|
|TrueBlue||That would be my assumption as well Cam. While underway, the OP most likely had the engine running at a higher RPM, than when idling in gear while tied at dock, thereby developing a higher engine temp and a need for increased coolant flow.|
|05-08-2008 12:13 PM|
|camaraderie||Since you've indicated a need to clean critters from the prop and bottom there is a good chance that you have a partially clogged intake thru hull that causes heating issues when more flow is demanded under power.|
|05-08-2008 12:07 PM|
Maybe so. In that case, dive, check the thru hull on the outside, then shut it off and check the hose between the thru hull and the strainer.
Might be just a debris problem.
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