Bringing Evinrude E-TEC owners together.

Register New Posts
 
 
 


Reply
 
Author Comment
 
Maurizio

Silver Level Member 4-2010
Registered: 10/14/08
Posts: 76
Reply with quote  #1 
After my first 100 perfect hours with my new 225 DPX (2009), EMM overheat alarm occurred when trolling at 500-1000 RPM for more than 15 minutes. Switching off, restarting and going to plane (3500-3800) for half hour or more, was fine, but after another around 15 minutes trolling, alarm pops up again.
Alarm code is 25, EMM temperature above expected range. Temperature of banks was quite normal, 70-75 °C. Normally, my EMM runs between 30-50°C.
At error, EMM was 80,7°C.
Attached some pdf for reference: a snapshot during alarm at 498 RPM, and a Report.

Why this strange overheat? A little debris in the EMM could overheat it only after some time and at low RPM, and not a cruise speed? I never gone on shallow water with sand or other debris. Or any other reason?

Tnx

Maurizio

 
Attached Files
pdf del3009095.pdf (28.72 KB, 101 views)
pdf del3009096.pdf (31.66 KB, 68 views)


__________________
E225DPXSEB
05249004

Maurizio

Silver Level Member 4-2010
Registered: 10/14/08
Posts: 76
Reply with quote  #2 
Please, any idea about this strange overheat only at low RPM?
On plane at 3000 or more rpm alarm do not fire.
I am concerned also because the engine is quite new (first season, 110 hours) and don't know if the problem is covered by warranty or not.

The problem is only in the EMM temperature: there is some thermostat or other item to check? More strange, the alarm sees a thing as "RPM limitation due overheat" or so, but the RPM is just at the lowest RPM. Too generic message?

Many thanks.

Maurizio

__________________
E225DPXSEB
05249004
Evinrude

Avatar / Picture

Moderator
Registered: 04/17/08
Posts: 1,644
Reply with quote  #3 

Remove your cooling hoses from your emm and make sure you can blow thru all the water passages. We find the clogging to happen in the VST pump. If my mind is working right the water comes from the top of the block thru the emm to the vst. Out the VST to the midsection. A clogged VST will not alow any water flow thru the emm.


__________________
The all new Barnacle Bills Web Site,
http://www.barnaclebillsmarine.com
Maurizio

Silver Level Member 4-2010
Registered: 10/14/08
Posts: 76
Reply with quote  #4 
Thanks, Evinrude: Can I find online any schematic of waterflow for my motor, please? The thing I do not understand is that only emm overheat and not port and starboard banks, and only at low RPM.

Boat now is far from me and the tech will operate only in the next weeks when the boat will be at sleep on the ground, so I am losting the last 2 weekends of this season...

Tnx a lot

Maurizio

__________________
E225DPXSEB
05249004
Chris

Silver Level Member 3-2010
Registered: 04/19/08
Posts: 497
Reply with quote  #5 
" A clogged VST will not alow any water flow thru the emm."

By VST do you mean the fuel pump and vapour seperator?

Does this pump water as well as fuel then?

__________________
Osprey Vipermax 7.0
E250 DPX
Serial# TBC
Cousy

Avatar / Picture

Registered: 10/29/08
Posts: 85
Reply with quote  #6 

The VST is the fuel pump, vapour seperator, water flows through the EMM and the VST, the water hoses on the EMM are marked, water flows through to cool the EMM and fuel in the VST and then goes to the bottom of the block this hose is partial to getting blocked with debris.

seahorse

Avatar / Picture

Moderator
Registered: 04/18/08
Posts: 6,045
Reply with quote  #7 


Maurizio,

What is the water pressure at idle in gear?

Was any work done to the boat or motor just before this problem showed up?

__________________
...possessing more tools than talent !
Maurizio

Silver Level Member 4-2010
Registered: 10/14/08
Posts: 76
Reply with quote  #8 
Sorry Seahorse, I don't know the pressure at idle in gear.
When fault happened, I just take the shots I published because casually I had the laptop with me, and not thinked to repeat to grab data in gear and at speed nor idle because I was alone and can't use the laptop and drive the boat at the same time, even I installed a fixed serial cable from motor to the boat's cabin.

Also I do not thinked to do that because at plane and trolling less 15 min. nothing happened, and I thinked was a transitory problem. Alarm happened the first time in the afternoon after 10 or more miles of navigation in open water, and no more when I come back to harbour driving other 15 miles. So, I was surprised when  it happened again the day after, because alarm fired after 15 or 20 min going around at 500/700 RPM after going out from harbour at slow speed and taking some 10 miles at 3500 RPM. At that point I come back to harbour taking another 10 miles back without any alarm. Then I leaved the boat because must come back to my work for some days.
  
I checked continuously the pee water from rear, and it was absolutely solid as usual even at idle, in gear or not, and not changed apparently with speed or RPMs. Checked visually also water intakes going in the water with my underwater mask, and nothing was inside, nor in the front holes or in lateral ones.

No working done on the motor, nor on the hull, all was as usual. Nor take any "bump"...

Now I am far from the boat but in some days it will be on ground for winter season, so I hope to check it soon with my mechanic, that is officially trained. I'm very curious to find what happened.

Strange also that I-commands can check only the wole (general) water temperature but cannot show selectively the EMM temperature: I mean that in my case, checking very often the motor temperature as I do normally with I-command gauges, and reading 75°C as usual or so, I was calm and quiet, and cannot preview in any manner the temperature of the EMM was starting to increase (sorry for english, I hope it is understandable). Anyway, I cannot mantain my laptop plugged everytime...

Many Thanks.

Maurizio

__________________
E225DPXSEB
05249004
Maurizio

Silver Level Member 4-2010
Registered: 10/14/08
Posts: 76
Reply with quote  #9 
News about EMM overheat: mechanic called me now telling there was a  ball of debris in the water pipe just before the EMM. He cleaned it and now the EMM temp is stable and not more than 40°C. No debris or blockage in the water separator. 

The amount of debris was not so big: so, at idle, the little amount of waterflow was not sufficient to cool thee EMM and alarm fired, but at higher speeds was sufficient, the temperature was lower and the alarm do not fire. When I will be there next week, I'll take some pictures of this strange debris, and the mechanic will teach me to check that pipe in the event to do myself next year in emergency.

About the debris, he told it is like sawdust, very strange, but he found it also in another motor in the same harbour. So it is an accidental event, grabbing this strange dust from harbour water.

About I-command: it is a very pity that I-command to not display separately the EMM temperature, because the data is technically available. In any marine motor the cooling system is the main concern, and this particular blockage is not even displayed by the rear water pee. So, there is not any manner to prevent it, but having also this datum displayed would be very useful. Is'nt it?

Bye

Maurizio


__________________
E225DPXSEB
05249004
Previous Topic | Next Topic
Print
Reply

Quick Navigation:

Disclaimer: Activities and modifications described or displayed on this message board and it's pages may be potentially dangerous. E-TEC Owners Group along with Barnacle Bills Marine does not endorse or make any claims to their safety or performance. Be sure a trained E-TEC service technician performs all your service work.
Powered by Website Toolbox - Create a Website Forum Hosting, Guestbook Hosting, or Website Chat Room for your website.