Hi guys,
I have a 2006 honda 225hp outboard I have been having trouble with overheating if I push the boat over 4000rpm - at 4000rpm it will run all day any faster and I am getting the single long beep overheating alarm and it is knocked into limp mode. I have twin engines and it is the starboard engine which appears to be overheating. Using a temperature gun I did notice the starboard engine manifold was hotter then the port engine manifold though off the top of my head I cannot remember the actual temp I was running.
To date I have
1. Replaced the thermistats
2. Replaced the impeller and impeller housing (old housing had a crack in it)
3. Reverse flushed from the thermistats and flushed with salt away product.
4. I have taken the large hose off the bottom of the manifold and checked for corrosion/build up restricting flow (there was a little though not a lot which I cleaned out)
5. I have bought the Dr Honda tool and software though admitedly I am not really confident in its use (I can see it has had overheats but don't know how to use it to find where/which sensor has registered these.
I am starting to run out of ideas... in the next few days I will replace the pressure relief valve and flush valves when i can get them in to ensure they are not causing the problem. If the pressure relief/flush valves don't sort the problem I will replace the large pipe on the bottom of the manifold just to make sure it isn't squeezing although I doubt this is the case.
One of the local boat dealers did mention flusing the engine with diluted hydrochloric acid which didn't seem like a great plan to me...
The only other thing I have played with was to replace all 4 batteries, a mate mentioned it was possible i didn't have a good connection which could also cause this type of fault though I am struggling to see how if it isn't happening throughout the rev range (Please correct me if I am wrong).
Any other idea's as to what could be going on??? I have been trying to tackle this for a while now and could really do with some advice...
Thank you for your time guys!
Rob
I have a 2006 honda 225hp outboard I have been having trouble with overheating if I push the boat over 4000rpm - at 4000rpm it will run all day any faster and I am getting the single long beep overheating alarm and it is knocked into limp mode. I have twin engines and it is the starboard engine which appears to be overheating. Using a temperature gun I did notice the starboard engine manifold was hotter then the port engine manifold though off the top of my head I cannot remember the actual temp I was running.
To date I have
1. Replaced the thermistats
2. Replaced the impeller and impeller housing (old housing had a crack in it)
3. Reverse flushed from the thermistats and flushed with salt away product.
4. I have taken the large hose off the bottom of the manifold and checked for corrosion/build up restricting flow (there was a little though not a lot which I cleaned out)
5. I have bought the Dr Honda tool and software though admitedly I am not really confident in its use (I can see it has had overheats but don't know how to use it to find where/which sensor has registered these.
I am starting to run out of ideas... in the next few days I will replace the pressure relief valve and flush valves when i can get them in to ensure they are not causing the problem. If the pressure relief/flush valves don't sort the problem I will replace the large pipe on the bottom of the manifold just to make sure it isn't squeezing although I doubt this is the case.
One of the local boat dealers did mention flusing the engine with diluted hydrochloric acid which didn't seem like a great plan to me...
The only other thing I have played with was to replace all 4 batteries, a mate mentioned it was possible i didn't have a good connection which could also cause this type of fault though I am struggling to see how if it isn't happening throughout the rev range (Please correct me if I am wrong).
Any other idea's as to what could be going on??? I have been trying to tackle this for a while now and could really do with some advice...
Thank you for your time guys!
Rob